├── .github ├── ISSUE_TEMPLATE.md └── PULL_REQUEST_TEMPLATE.md ├── .gitignore ├── Adafruit_ADS1x15 ├── ADS1x15.py └── __init__.py ├── LICENSE ├── README.md ├── examples ├── comparator.py ├── continuous.py ├── differential.py └── simpletest.py ├── ez_setup.py └── setup.py /.github/ISSUE_TEMPLATE.md: -------------------------------------------------------------------------------- 1 | Thank you for opening an issue on an Adafruit Python library repository. To 2 | improve the speed of resolution please review the following guidelines and 3 | common troubleshooting steps below before creating the issue: 4 | 5 | - **Do not use GitHub issues for troubleshooting projects and issues.** Instead use 6 | the forums at http://forums.adafruit.com to ask questions and troubleshoot why 7 | something isn't working as expected. In many cases the problem is a common issue 8 | that you will more quickly receive help from the forum community. GitHub issues 9 | are meant for known defects in the code. 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Don't fret, the open source community thrives on 24 | forks and GitHub makes it easy to keep your changes in a forked repo. 25 | 26 | After reviewing the guidelines above you can delete this text from the pull request. 27 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | setuptools-* 2 | # Byte-compiled / optimized / DLL files 3 | __pycache__/ 4 | *.py[cod] 5 | *$py.class 6 | 7 | # C extensions 8 | *.so 9 | 10 | # Distribution / packaging 11 | .Python 12 | env/ 13 | build/ 14 | develop-eggs/ 15 | dist/ 16 | downloads/ 17 | eggs/ 18 | .eggs/ 19 | lib/ 20 | lib64/ 21 | parts/ 22 | sdist/ 23 | var/ 24 | *.egg-info/ 25 | .installed.cfg 26 | *.egg 27 | 28 | # PyInstaller 29 | # Usually these files are written by a python script from a template 30 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 31 | *.manifest 32 | *.spec 33 | 34 | # Installer logs 35 | pip-log.txt 36 | pip-delete-this-directory.txt 37 | 38 | # Unit test / coverage reports 39 | htmlcov/ 40 | .tox/ 41 | .coverage 42 | .coverage.* 43 | .cache 44 | nosetests.xml 45 | coverage.xml 46 | *,cover 47 | .hypothesis/ 48 | 49 | # Translations 50 | *.mo 51 | *.pot 52 | 53 | # Django stuff: 54 | *.log 55 | 56 | # Sphinx documentation 57 | docs/_build/ 58 | 59 | # PyBuilder 60 | target/ 61 | 62 | #Ipython Notebook 63 | .ipynb_checkpoints 64 | -------------------------------------------------------------------------------- /Adafruit_ADS1x15/ADS1x15.py: -------------------------------------------------------------------------------- 1 | # Copyright (c) 2016 Adafruit Industries 2 | # Author: Tony DiCola 3 | # 4 | # Permission is hereby granted, free of charge, to any person obtaining a copy 5 | # of this software and associated documentation files (the "Software"), to deal 6 | # in the Software without restriction, including without limitation the rights 7 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 | # copies of the Software, and to permit persons to whom the Software is 9 | # furnished to do so, subject to the following conditions: 10 | # 11 | # The above copyright notice and this permission notice shall be included in 12 | # all copies or substantial portions of the Software. 13 | # 14 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 20 | # THE SOFTWARE. 21 | import time 22 | 23 | 24 | # Register and other configuration values: 25 | ADS1x15_DEFAULT_ADDRESS = 0x48 26 | ADS1x15_POINTER_CONVERSION = 0x00 27 | ADS1x15_POINTER_CONFIG = 0x01 28 | ADS1x15_POINTER_LOW_THRESHOLD = 0x02 29 | ADS1x15_POINTER_HIGH_THRESHOLD = 0x03 30 | ADS1x15_CONFIG_OS_SINGLE = 0x8000 31 | ADS1x15_CONFIG_MUX_OFFSET = 12 32 | # Maping of gain values to config register values. 33 | ADS1x15_CONFIG_GAIN = { 34 | 2/3: 0x0000, 35 | 1: 0x0200, 36 | 2: 0x0400, 37 | 4: 0x0600, 38 | 8: 0x0800, 39 | 16: 0x0A00 40 | } 41 | ADS1x15_CONFIG_MODE_CONTINUOUS = 0x0000 42 | ADS1x15_CONFIG_MODE_SINGLE = 0x0100 43 | # Mapping of data/sample rate to config register values for ADS1015 (faster). 44 | ADS1015_CONFIG_DR = { 45 | 128: 0x0000, 46 | 250: 0x0020, 47 | 490: 0x0040, 48 | 920: 0x0060, 49 | 1600: 0x0080, 50 | 2400: 0x00A0, 51 | 3300: 0x00C0 52 | } 53 | # Mapping of data/sample rate to config register values for ADS1115 (slower). 54 | ADS1115_CONFIG_DR = { 55 | 8: 0x0000, 56 | 16: 0x0020, 57 | 32: 0x0040, 58 | 64: 0x0060, 59 | 128: 0x0080, 60 | 250: 0x00A0, 61 | 475: 0x00C0, 62 | 860: 0x00E0 63 | } 64 | ADS1x15_CONFIG_COMP_WINDOW = 0x0010 65 | ADS1x15_CONFIG_COMP_ACTIVE_HIGH = 0x0008 66 | ADS1x15_CONFIG_COMP_LATCHING = 0x0004 67 | ADS1x15_CONFIG_COMP_QUE = { 68 | 1: 0x0000, 69 | 2: 0x0001, 70 | 4: 0x0002 71 | } 72 | ADS1x15_CONFIG_COMP_QUE_DISABLE = 0x0003 73 | 74 | 75 | class ADS1x15(object): 76 | """Base functionality for ADS1x15 analog to digital converters.""" 77 | 78 | def __init__(self, address=ADS1x15_DEFAULT_ADDRESS, i2c=None, **kwargs): 79 | if i2c is None: 80 | import Adafruit_GPIO.I2C as I2C 81 | i2c = I2C 82 | self._device = i2c.get_i2c_device(address, **kwargs) 83 | 84 | def _data_rate_default(self): 85 | """Retrieve the default data rate for this ADC (in samples per second). 86 | Should be implemented by subclasses. 87 | """ 88 | raise NotImplementedError('Subclasses must implement _data_rate_default!') 89 | 90 | def _data_rate_config(self, data_rate): 91 | """Subclasses should override this function and return a 16-bit value 92 | that can be OR'ed with the config register to set the specified 93 | data rate. If a value of None is specified then a default data_rate 94 | setting should be returned. If an invalid or unsupported data_rate is 95 | provided then an exception should be thrown. 96 | """ 97 | raise NotImplementedError('Subclass must implement _data_rate_config function!') 98 | 99 | def _conversion_value(self, low, high): 100 | """Subclasses should override this function that takes the low and high 101 | byte of a conversion result and returns a signed integer value. 102 | """ 103 | raise NotImplementedError('Subclass must implement _conversion_value function!') 104 | 105 | def _read(self, mux, gain, data_rate, mode): 106 | """Perform an ADC read with the provided mux, gain, data_rate, and mode 107 | values. Returns the signed integer result of the read. 108 | """ 109 | config = ADS1x15_CONFIG_OS_SINGLE # Go out of power-down mode for conversion. 110 | # Specify mux value. 111 | config |= (mux & 0x07) << ADS1x15_CONFIG_MUX_OFFSET 112 | # Validate the passed in gain and then set it in the config. 113 | if gain not in ADS1x15_CONFIG_GAIN: 114 | raise ValueError('Gain must be one of: 2/3, 1, 2, 4, 8, 16') 115 | config |= ADS1x15_CONFIG_GAIN[gain] 116 | # Set the mode (continuous or single shot). 117 | config |= mode 118 | # Get the default data rate if none is specified (default differs between 119 | # ADS1015 and ADS1115). 120 | if data_rate is None: 121 | data_rate = self._data_rate_default() 122 | # Set the data rate (this is controlled by the subclass as it differs 123 | # between ADS1015 and ADS1115). 124 | config |= self._data_rate_config(data_rate) 125 | config |= ADS1x15_CONFIG_COMP_QUE_DISABLE # Disble comparator mode. 126 | # Send the config value to start the ADC conversion. 127 | # Explicitly break the 16-bit value down to a big endian pair of bytes. 128 | self._device.writeList(ADS1x15_POINTER_CONFIG, [(config >> 8) & 0xFF, config & 0xFF]) 129 | # Wait for the ADC sample to finish based on the sample rate plus a 130 | # small offset to be sure (0.1 millisecond). 131 | time.sleep(1.0/data_rate+0.0001) 132 | # Retrieve the result. 133 | result = self._device.readList(ADS1x15_POINTER_CONVERSION, 2) 134 | return self._conversion_value(result[1], result[0]) 135 | 136 | def _read_comparator(self, mux, gain, data_rate, mode, high_threshold, 137 | low_threshold, active_low, traditional, latching, 138 | num_readings): 139 | """Perform an ADC read with the provided mux, gain, data_rate, and mode 140 | values and with the comparator enabled as specified. Returns the signed 141 | integer result of the read. 142 | """ 143 | assert num_readings == 1 or num_readings == 2 or num_readings == 4, 'Num readings must be 1, 2, or 4!' 144 | # Set high and low threshold register values. 145 | self._device.writeList(ADS1x15_POINTER_HIGH_THRESHOLD, [(high_threshold >> 8) & 0xFF, high_threshold & 0xFF]) 146 | self._device.writeList(ADS1x15_POINTER_LOW_THRESHOLD, [(low_threshold >> 8) & 0xFF, low_threshold & 0xFF]) 147 | # Now build up the appropriate config register value. 148 | config = ADS1x15_CONFIG_OS_SINGLE # Go out of power-down mode for conversion. 149 | # Specify mux value. 150 | config |= (mux & 0x07) << ADS1x15_CONFIG_MUX_OFFSET 151 | # Validate the passed in gain and then set it in the config. 152 | if gain not in ADS1x15_CONFIG_GAIN: 153 | raise ValueError('Gain must be one of: 2/3, 1, 2, 4, 8, 16') 154 | config |= ADS1x15_CONFIG_GAIN[gain] 155 | # Set the mode (continuous or single shot). 156 | config |= mode 157 | # Get the default data rate if none is specified (default differs between 158 | # ADS1015 and ADS1115). 159 | if data_rate is None: 160 | data_rate = self._data_rate_default() 161 | # Set the data rate (this is controlled by the subclass as it differs 162 | # between ADS1015 and ADS1115). 163 | config |= self._data_rate_config(data_rate) 164 | # Enable window mode if required. 165 | if not traditional: 166 | config |= ADS1x15_CONFIG_COMP_WINDOW 167 | # Enable active high mode if required. 168 | if not active_low: 169 | config |= ADS1x15_CONFIG_COMP_ACTIVE_HIGH 170 | # Enable latching mode if required. 171 | if latching: 172 | config |= ADS1x15_CONFIG_COMP_LATCHING 173 | # Set number of comparator hits before alerting. 174 | config |= ADS1x15_CONFIG_COMP_QUE[num_readings] 175 | # Send the config value to start the ADC conversion. 176 | # Explicitly break the 16-bit value down to a big endian pair of bytes. 177 | self._device.writeList(ADS1x15_POINTER_CONFIG, [(config >> 8) & 0xFF, config & 0xFF]) 178 | # Wait for the ADC sample to finish based on the sample rate plus a 179 | # small offset to be sure (0.1 millisecond). 180 | time.sleep(1.0/data_rate+0.0001) 181 | # Retrieve the result. 182 | result = self._device.readList(ADS1x15_POINTER_CONVERSION, 2) 183 | return self._conversion_value(result[1], result[0]) 184 | 185 | def read_adc(self, channel, gain=1, data_rate=None): 186 | """Read a single ADC channel and return the ADC value as a signed integer 187 | result. Channel must be a value within 0-3. 188 | """ 189 | assert 0 <= channel <= 3, 'Channel must be a value within 0-3!' 190 | # Perform a single shot read and set the mux value to the channel plus 191 | # the highest bit (bit 3) set. 192 | return self._read(channel + 0x04, gain, data_rate, ADS1x15_CONFIG_MODE_SINGLE) 193 | 194 | def read_adc_difference(self, differential, gain=1, data_rate=None): 195 | """Read the difference between two ADC channels and return the ADC value 196 | as a signed integer result. Differential must be one of: 197 | - 0 = Channel 0 minus channel 1 198 | - 1 = Channel 0 minus channel 3 199 | - 2 = Channel 1 minus channel 3 200 | - 3 = Channel 2 minus channel 3 201 | """ 202 | assert 0 <= differential <= 3, 'Differential must be a value within 0-3!' 203 | # Perform a single shot read using the provided differential value 204 | # as the mux value (which will enable differential mode). 205 | return self._read(differential, gain, data_rate, ADS1x15_CONFIG_MODE_SINGLE) 206 | 207 | def start_adc(self, channel, gain=1, data_rate=None): 208 | """Start continuous ADC conversions on the specified channel (0-3). Will 209 | return an initial conversion result, then call the get_last_result() 210 | function to read the most recent conversion result. Call stop_adc() to 211 | stop conversions. 212 | """ 213 | assert 0 <= channel <= 3, 'Channel must be a value within 0-3!' 214 | # Start continuous reads and set the mux value to the channel plus 215 | # the highest bit (bit 3) set. 216 | return self._read(channel + 0x04, gain, data_rate, ADS1x15_CONFIG_MODE_CONTINUOUS) 217 | 218 | def start_adc_difference(self, differential, gain=1, data_rate=None): 219 | """Start continuous ADC conversions between two ADC channels. Differential 220 | must be one of: 221 | - 0 = Channel 0 minus channel 1 222 | - 1 = Channel 0 minus channel 3 223 | - 2 = Channel 1 minus channel 3 224 | - 3 = Channel 2 minus channel 3 225 | Will return an initial conversion result, then call the get_last_result() 226 | function continuously to read the most recent conversion result. Call 227 | stop_adc() to stop conversions. 228 | """ 229 | assert 0 <= differential <= 3, 'Differential must be a value within 0-3!' 230 | # Perform a single shot read using the provided differential value 231 | # as the mux value (which will enable differential mode). 232 | return self._read(differential, gain, data_rate, ADS1x15_CONFIG_MODE_CONTINUOUS) 233 | 234 | def start_adc_comparator(self, channel, high_threshold, low_threshold, 235 | gain=1, data_rate=None, active_low=True, 236 | traditional=True, latching=False, num_readings=1): 237 | """Start continuous ADC conversions on the specified channel (0-3) with 238 | the comparator enabled. When enabled the comparator to will check if 239 | the ADC value is within the high_threshold & low_threshold value (both 240 | should be signed 16-bit integers) and trigger the ALERT pin. The 241 | behavior can be controlled by the following parameters: 242 | - active_low: Boolean that indicates if ALERT is pulled low or high 243 | when active/triggered. Default is true, active low. 244 | - traditional: Boolean that indicates if the comparator is in traditional 245 | mode where it fires when the value is within the threshold, 246 | or in window mode where it fires when the value is _outside_ 247 | the threshold range. Default is true, traditional mode. 248 | - latching: Boolean that indicates if the alert should be held until 249 | get_last_result() is called to read the value and clear 250 | the alert. Default is false, non-latching. 251 | - num_readings: The number of readings that match the comparator before 252 | triggering the alert. Can be 1, 2, or 4. Default is 1. 253 | Will return an initial conversion result, then call the get_last_result() 254 | function continuously to read the most recent conversion result. Call 255 | stop_adc() to stop conversions. 256 | """ 257 | assert 0 <= channel <= 3, 'Channel must be a value within 0-3!' 258 | # Start continuous reads with comparator and set the mux value to the 259 | # channel plus the highest bit (bit 3) set. 260 | return self._read_comparator(channel + 0x04, gain, data_rate, 261 | ADS1x15_CONFIG_MODE_CONTINUOUS, 262 | high_threshold, low_threshold, active_low, 263 | traditional, latching, num_readings) 264 | 265 | def start_adc_difference_comparator(self, differential, high_threshold, low_threshold, 266 | gain=1, data_rate=None, active_low=True, 267 | traditional=True, latching=False, num_readings=1): 268 | """Start continuous ADC conversions between two channels with 269 | the comparator enabled. See start_adc_difference for valid differential 270 | parameter values and their meaning. When enabled the comparator to will 271 | check if the ADC value is within the high_threshold & low_threshold value 272 | (both should be signed 16-bit integers) and trigger the ALERT pin. The 273 | behavior can be controlled by the following parameters: 274 | - active_low: Boolean that indicates if ALERT is pulled low or high 275 | when active/triggered. Default is true, active low. 276 | - traditional: Boolean that indicates if the comparator is in traditional 277 | mode where it fires when the value is within the threshold, 278 | or in window mode where it fires when the value is _outside_ 279 | the threshold range. Default is true, traditional mode. 280 | - latching: Boolean that indicates if the alert should be held until 281 | get_last_result() is called to read the value and clear 282 | the alert. Default is false, non-latching. 283 | - num_readings: The number of readings that match the comparator before 284 | triggering the alert. Can be 1, 2, or 4. Default is 1. 285 | Will return an initial conversion result, then call the get_last_result() 286 | function continuously to read the most recent conversion result. Call 287 | stop_adc() to stop conversions. 288 | """ 289 | assert 0 <= differential <= 3, 'Differential must be a value within 0-3!' 290 | # Start continuous reads with comparator and set the mux value to the 291 | # channel plus the highest bit (bit 3) set. 292 | return self._read_comparator(differential, gain, data_rate, 293 | ADS1x15_CONFIG_MODE_CONTINUOUS, 294 | high_threshold, low_threshold, active_low, 295 | traditional, latching, num_readings) 296 | 297 | def stop_adc(self): 298 | """Stop all continuous ADC conversions (either normal or difference mode). 299 | """ 300 | # Set the config register to its default value of 0x8583 to stop 301 | # continuous conversions. 302 | config = 0x8583 303 | self._device.writeList(ADS1x15_POINTER_CONFIG, [(config >> 8) & 0xFF, config & 0xFF]) 304 | 305 | def get_last_result(self): 306 | """Read the last conversion result when in continuous conversion mode. 307 | Will return a signed integer value. 308 | """ 309 | # Retrieve the conversion register value, convert to a signed int, and 310 | # return it. 311 | result = self._device.readList(ADS1x15_POINTER_CONVERSION, 2) 312 | return self._conversion_value(result[1], result[0]) 313 | 314 | 315 | class ADS1115(ADS1x15): 316 | """ADS1115 16-bit analog to digital converter instance.""" 317 | 318 | def __init__(self, *args, **kwargs): 319 | super(ADS1115, self).__init__(*args, **kwargs) 320 | 321 | def _data_rate_default(self): 322 | # Default from datasheet page 16, config register DR bit default. 323 | return 128 324 | 325 | def _data_rate_config(self, data_rate): 326 | if data_rate not in ADS1115_CONFIG_DR: 327 | raise ValueError('Data rate must be one of: 8, 16, 32, 64, 128, 250, 475, 860') 328 | return ADS1115_CONFIG_DR[data_rate] 329 | 330 | def _conversion_value(self, low, high): 331 | # Convert to 16-bit signed value. 332 | value = ((high & 0xFF) << 8) | (low & 0xFF) 333 | # Check for sign bit and turn into a negative value if set. 334 | if value & 0x8000 != 0: 335 | value -= 1 << 16 336 | return value 337 | 338 | 339 | class ADS1015(ADS1x15): 340 | """ADS1015 12-bit analog to digital converter instance.""" 341 | 342 | def __init__(self, *args, **kwargs): 343 | super(ADS1015, self).__init__(*args, **kwargs) 344 | 345 | def _data_rate_default(self): 346 | # Default from datasheet page 19, config register DR bit default. 347 | return 1600 348 | 349 | def _data_rate_config(self, data_rate): 350 | if data_rate not in ADS1015_CONFIG_DR: 351 | raise ValueError('Data rate must be one of: 128, 250, 490, 920, 1600, 2400, 3300') 352 | return ADS1015_CONFIG_DR[data_rate] 353 | 354 | def _conversion_value(self, low, high): 355 | # Convert to 12-bit signed value. 356 | value = ((high & 0xFF) << 4) | ((low & 0xFF) >> 4) 357 | # Check for sign bit and turn into a negative value if set. 358 | if value & 0x800 != 0: 359 | value -= 1 << 12 360 | return value 361 | -------------------------------------------------------------------------------- /Adafruit_ADS1x15/__init__.py: -------------------------------------------------------------------------------- 1 | from .ADS1x15 import ADS1115, ADS1015 2 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2016 Adafruit Industries 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | **DEPRECATED LIBRARY. Adafruit Python ADS1x15** 2 | 3 | This library has been deprecated! We are leaving this up for historical and research purposes but archiving the repository. 4 | 5 | We are now only supporting the use of our CircuitPython libraries for use with Python. 6 | 7 | Check out this guide for info on using character LCDs with the CircuitPython library: https://github.com/adafruit/Adafruit_CircuitPython_ADS1x15 8 | -------------------------------------------------------------------------------- /examples/comparator.py: -------------------------------------------------------------------------------- 1 | # Simple demo of continuous ADC conversion mode for channel 0 of the ADS1x15 ADC 2 | # with the comparator enabled. 3 | # Author: Tony DiCola 4 | # License: Public Domain 5 | import time 6 | 7 | # Import the ADS1x15 module. 8 | import Adafruit_ADS1x15 9 | 10 | 11 | # Create an ADS1115 ADC (16-bit) instance. 12 | adc = Adafruit_ADS1x15.ADS1115() 13 | 14 | # Or create an ADS1015 ADC (12-bit) instance. 15 | #adc = Adafruit_ADS1x15.ADS1015() 16 | 17 | # Note you can change the I2C address from its default (0x48), and/or the I2C 18 | # bus by passing in these optional parameters: 19 | #adc = Adafruit_ADS1x15.ADS1015(address=0x49, busnum=1) 20 | 21 | # Choose a gain of 1 for reading voltages from 0 to 4.09V. 22 | # Or pick a different gain to change the range of voltages that are read: 23 | # - 2/3 = +/-6.144V 24 | # - 1 = +/-4.096V 25 | # - 2 = +/-2.048V 26 | # - 4 = +/-1.024V 27 | # - 8 = +/-0.512V 28 | # - 16 = +/-0.256V 29 | # See table 3 in the ADS1015/ADS1115 datasheet for more info on gain. 30 | GAIN = 1 31 | 32 | # Start continuous ADC conversions on channel 0 using the previously set gain 33 | # value, and with the comparator enabled. See the comparator section of the 34 | # datasheet for information on what the comparator does, but at a high level 35 | # the comparator can trigger the ALERT pin when an ADC value falls within 36 | # (or outside) a provided threshold range. The comparator can be configured with 37 | # these parameters: 38 | # - active_low: Boolean that indicates if ALERT is pulled low or high 39 | # when active/triggered. Default is true, active low. 40 | # - traditional: Boolean that indicates if the comparator is in traditional 41 | # mode where it fires when the value is within the threshold, 42 | # or in window mode where it fires when the value is _outside_ 43 | # the threshold range. Default is true, traditional mode. 44 | # - latching: Boolean that indicates if the alert should be held until 45 | # get_last_result() is called to read the value and clear 46 | # the alert. Default is false, non-latching. 47 | # - num_readings: The number of readings that match the comparator before 48 | # triggering the alert. Can be 1, 2, or 4. Default is 1. 49 | # The call below will enable the comparator with its defaults and a threshold 50 | # range of 5000-20000. This means if the ADC value falls within 5000-20000 the 51 | # ALERT pin will briefly be pulled low. 52 | # Note you can also pass an optional data_rate parameter, see the simpletest.py 53 | # example and read_adc function for more infromation. 54 | adc.start_adc_comparator(0, # Channel number 55 | 20000, 5000, # High threshold value, low threshold value 56 | active_low=True, traditional=True, latching=False, 57 | num_readings=1, gain=GAIN) 58 | # Once continuous ADC conversions are started you can call get_last_result() to 59 | # retrieve the latest result, or stop_adc() to stop conversions. 60 | 61 | # Note you can also call start_adc_difference_comparator() to take continuous 62 | # differential readings with comparator enabled. See the read_adc_difference() 63 | # function in differential.py for more information and parameter description. 64 | 65 | # Read channel 0 with comparator for 5 seconds and print out its values. 66 | print('Reading ADS1x15 channel 0 for 5 seconds with comparator...') 67 | start = time.time() 68 | while (time.time() - start) <= 5.0: 69 | # Read the last ADC conversion value and print it out. 70 | value = adc.get_last_result() 71 | # WARNING! If you try to read any other ADC channel during this continuous 72 | # conversion (like by calling read_adc again) it will disable the 73 | # continuous conversion! 74 | print('Channel 0: {0}'.format(value)) 75 | # Sleep for half a second. 76 | time.sleep(0.5) 77 | 78 | # Stop continuous conversion. After this point you can't get data from get_last_result! 79 | adc.stop_adc() 80 | -------------------------------------------------------------------------------- /examples/continuous.py: -------------------------------------------------------------------------------- 1 | # Simple demo of continuous ADC conversion mode for channel 0 of the ADS1x15 ADC. 2 | # Author: Tony DiCola 3 | # License: Public Domain 4 | import time 5 | 6 | # Import the ADS1x15 module. 7 | import Adafruit_ADS1x15 8 | 9 | 10 | # Create an ADS1115 ADC (16-bit) instance. 11 | adc = Adafruit_ADS1x15.ADS1115() 12 | 13 | # Or create an ADS1015 ADC (12-bit) instance. 14 | #adc = Adafruit_ADS1x15.ADS1015() 15 | 16 | # Note you can change the I2C address from its default (0x48), and/or the I2C 17 | # bus by passing in these optional parameters: 18 | #adc = Adafruit_ADS1x15.ADS1015(address=0x49, busnum=1) 19 | 20 | # Choose a gain of 1 for reading voltages from 0 to 4.09V. 21 | # Or pick a different gain to change the range of voltages that are read: 22 | # - 2/3 = +/-6.144V 23 | # - 1 = +/-4.096V 24 | # - 2 = +/-2.048V 25 | # - 4 = +/-1.024V 26 | # - 8 = +/-0.512V 27 | # - 16 = +/-0.256V 28 | # See table 3 in the ADS1015/ADS1115 datasheet for more info on gain. 29 | GAIN = 1 30 | 31 | # Start continuous ADC conversions on channel 0 using the previously set gain 32 | # value. Note you can also pass an optional data_rate parameter, see the simpletest.py 33 | # example and read_adc function for more infromation. 34 | adc.start_adc(0, gain=GAIN) 35 | # Once continuous ADC conversions are started you can call get_last_result() to 36 | # retrieve the latest result, or stop_adc() to stop conversions. 37 | 38 | # Note you can also call start_adc_difference() to take continuous differential 39 | # readings. See the read_adc_difference() function in differential.py for more 40 | # information and parameter description. 41 | 42 | # Read channel 0 for 5 seconds and print out its values. 43 | print('Reading ADS1x15 channel 0 for 5 seconds...') 44 | start = time.time() 45 | while (time.time() - start) <= 5.0: 46 | # Read the last ADC conversion value and print it out. 47 | value = adc.get_last_result() 48 | # WARNING! If you try to read any other ADC channel during this continuous 49 | # conversion (like by calling read_adc again) it will disable the 50 | # continuous conversion! 51 | print('Channel 0: {0}'.format(value)) 52 | # Sleep for half a second. 53 | time.sleep(0.5) 54 | 55 | # Stop continuous conversion. After this point you can't get data from get_last_result! 56 | adc.stop_adc() 57 | -------------------------------------------------------------------------------- /examples/differential.py: -------------------------------------------------------------------------------- 1 | # Simple demo of reading the difference between channel 1 and 0 on an ADS1x15 ADC. 2 | # Author: Tony DiCola 3 | # License: Public Domain 4 | import time 5 | 6 | # Import the ADS1x15 module. 7 | import Adafruit_ADS1x15 8 | 9 | 10 | # Create an ADS1115 ADC (16-bit) instance. 11 | adc = Adafruit_ADS1x15.ADS1115() 12 | 13 | # Or create an ADS1015 ADC (12-bit) instance. 14 | #adc = Adafruit_ADS1x15.ADS1015() 15 | 16 | # Note you can change the I2C address from its default (0x48), and/or the I2C 17 | # bus by passing in these optional parameters: 18 | #adc = Adafruit_ADS1x15.ADS1015(address=0x49, busnum=1) 19 | 20 | # Choose a gain of 1 for reading voltages from 0 to 4.09V. 21 | # Or pick a different gain to change the range of voltages that are read: 22 | # - 2/3 = +/-6.144V 23 | # - 1 = +/-4.096V 24 | # - 2 = +/-2.048V 25 | # - 4 = +/-1.024V 26 | # - 8 = +/-0.512V 27 | # - 16 = +/-0.256V 28 | # See table 3 in the ADS1015/ADS1115 datasheet for more info on gain. 29 | GAIN = 1 30 | 31 | print('Press Ctrl-C to quit...') 32 | while True: 33 | # Read the difference between channel 0 and 1 (i.e. channel 0 minus channel 1). 34 | # Note you can change the differential value to the following: 35 | # - 0 = Channel 0 minus channel 1 36 | # - 1 = Channel 0 minus channel 3 37 | # - 2 = Channel 1 minus channel 3 38 | # - 3 = Channel 2 minus channel 3 39 | value = adc.read_adc_difference(0, gain=GAIN) 40 | # Note you can also pass an optional data_rate parameter above, see 41 | # simpletest.py and the read_adc function for more information. 42 | # Value will be a signed 12 or 16 bit integer value (depending on the ADC 43 | # precision, ADS1015 = 12-bit or ADS1115 = 16-bit). 44 | print('Channel 0 minus 1: {0}'.format(value)) 45 | # Pause for half a second. 46 | time.sleep(0.5) 47 | -------------------------------------------------------------------------------- /examples/simpletest.py: -------------------------------------------------------------------------------- 1 | # Simple demo of reading each analog input from the ADS1x15 and printing it to 2 | # the screen. 3 | # Author: Tony DiCola 4 | # License: Public Domain 5 | import time 6 | 7 | # Import the ADS1x15 module. 8 | import Adafruit_ADS1x15 9 | 10 | 11 | # Create an ADS1115 ADC (16-bit) instance. 12 | adc = Adafruit_ADS1x15.ADS1115() 13 | 14 | # Or create an ADS1015 ADC (12-bit) instance. 15 | #adc = Adafruit_ADS1x15.ADS1015() 16 | 17 | # Note you can change the I2C address from its default (0x48), and/or the I2C 18 | # bus by passing in these optional parameters: 19 | #adc = Adafruit_ADS1x15.ADS1015(address=0x49, busnum=1) 20 | 21 | # Choose a gain of 1 for reading voltages from 0 to 4.09V. 22 | # Or pick a different gain to change the range of voltages that are read: 23 | # - 2/3 = +/-6.144V 24 | # - 1 = +/-4.096V 25 | # - 2 = +/-2.048V 26 | # - 4 = +/-1.024V 27 | # - 8 = +/-0.512V 28 | # - 16 = +/-0.256V 29 | # See table 3 in the ADS1015/ADS1115 datasheet for more info on gain. 30 | GAIN = 1 31 | 32 | print('Reading ADS1x15 values, press Ctrl-C to quit...') 33 | # Print nice channel column headers. 34 | print('| {0:>6} | {1:>6} | {2:>6} | {3:>6} |'.format(*range(4))) 35 | print('-' * 37) 36 | # Main loop. 37 | while True: 38 | # Read all the ADC channel values in a list. 39 | values = [0]*4 40 | for i in range(4): 41 | # Read the specified ADC channel using the previously set gain value. 42 | values[i] = adc.read_adc(i, gain=GAIN) 43 | # Note you can also pass in an optional data_rate parameter that controls 44 | # the ADC conversion time (in samples/second). Each chip has a different 45 | # set of allowed data rate values, see datasheet Table 9 config register 46 | # DR bit values. 47 | #values[i] = adc.read_adc(i, gain=GAIN, data_rate=128) 48 | # Each value will be a 12 or 16 bit signed integer value depending on the 49 | # ADC (ADS1015 = 12-bit, ADS1115 = 16-bit). 50 | # Print the ADC values. 51 | print('| {0:>6} | {1:>6} | {2:>6} | {3:>6} |'.format(*values)) 52 | # Pause for half a second. 53 | time.sleep(0.5) 54 | -------------------------------------------------------------------------------- /ez_setup.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | """Bootstrap setuptools installation 3 | 4 | To use setuptools in your package's setup.py, include this 5 | file in the same directory and add this to the top of your setup.py:: 6 | 7 | from ez_setup import use_setuptools 8 | use_setuptools() 9 | 10 | To require a specific version of setuptools, set a download 11 | mirror, or use an alternate download directory, simply supply 12 | the appropriate options to ``use_setuptools()``. 13 | 14 | This file can also be run as a script to install or upgrade setuptools. 15 | """ 16 | import os 17 | import shutil 18 | import sys 19 | import tempfile 20 | import zipfile 21 | import optparse 22 | import subprocess 23 | import platform 24 | import textwrap 25 | import contextlib 26 | 27 | from distutils import log 28 | 29 | try: 30 | from site import USER_SITE 31 | except ImportError: 32 | USER_SITE = None 33 | 34 | DEFAULT_VERSION = "3.5.1" 35 | DEFAULT_URL = "https://pypi.python.org/packages/source/s/setuptools/" 36 | 37 | def _python_cmd(*args): 38 | """ 39 | Return True if the command succeeded. 40 | """ 41 | args = (sys.executable,) + args 42 | return subprocess.call(args) == 0 43 | 44 | 45 | def _install(archive_filename, install_args=()): 46 | with archive_context(archive_filename): 47 | # installing 48 | log.warn('Installing Setuptools') 49 | if not _python_cmd('setup.py', 'install', *install_args): 50 | log.warn('Something went wrong during the installation.') 51 | log.warn('See the error message above.') 52 | # exitcode will be 2 53 | return 2 54 | 55 | 56 | def _build_egg(egg, archive_filename, to_dir): 57 | with archive_context(archive_filename): 58 | # building an egg 59 | log.warn('Building a Setuptools egg in %s', to_dir) 60 | _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir) 61 | # returning the result 62 | log.warn(egg) 63 | if not os.path.exists(egg): 64 | raise IOError('Could not build the egg.') 65 | 66 | 67 | def get_zip_class(): 68 | """ 69 | Supplement ZipFile class to support context manager for Python 2.6 70 | """ 71 | class ContextualZipFile(zipfile.ZipFile): 72 | def __enter__(self): 73 | return self 74 | def __exit__(self, type, value, traceback): 75 | self.close 76 | return zipfile.ZipFile if hasattr(zipfile.ZipFile, '__exit__') else \ 77 | ContextualZipFile 78 | 79 | 80 | @contextlib.contextmanager 81 | def archive_context(filename): 82 | # extracting the archive 83 | tmpdir = tempfile.mkdtemp() 84 | log.warn('Extracting in %s', tmpdir) 85 | old_wd = os.getcwd() 86 | try: 87 | os.chdir(tmpdir) 88 | with get_zip_class()(filename) as archive: 89 | archive.extractall() 90 | 91 | # going in the directory 92 | subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0]) 93 | os.chdir(subdir) 94 | log.warn('Now working in %s', subdir) 95 | yield 96 | 97 | finally: 98 | os.chdir(old_wd) 99 | shutil.rmtree(tmpdir) 100 | 101 | 102 | def _do_download(version, download_base, to_dir, download_delay): 103 | egg = os.path.join(to_dir, 'setuptools-%s-py%d.%d.egg' 104 | % (version, sys.version_info[0], sys.version_info[1])) 105 | if not os.path.exists(egg): 106 | archive = download_setuptools(version, download_base, 107 | to_dir, download_delay) 108 | _build_egg(egg, archive, to_dir) 109 | sys.path.insert(0, egg) 110 | 111 | # Remove previously-imported pkg_resources if present (see 112 | # https://bitbucket.org/pypa/setuptools/pull-request/7/ for details). 113 | if 'pkg_resources' in sys.modules: 114 | del sys.modules['pkg_resources'] 115 | 116 | import setuptools 117 | setuptools.bootstrap_install_from = egg 118 | 119 | 120 | def use_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, 121 | to_dir=os.curdir, download_delay=15): 122 | to_dir = os.path.abspath(to_dir) 123 | rep_modules = 'pkg_resources', 'setuptools' 124 | imported = set(sys.modules).intersection(rep_modules) 125 | try: 126 | import pkg_resources 127 | except ImportError: 128 | return _do_download(version, download_base, to_dir, download_delay) 129 | try: 130 | pkg_resources.require("setuptools>=" + version) 131 | return 132 | except pkg_resources.DistributionNotFound: 133 | return _do_download(version, download_base, to_dir, download_delay) 134 | except pkg_resources.VersionConflict as VC_err: 135 | if imported: 136 | msg = textwrap.dedent(""" 137 | The required version of setuptools (>={version}) is not available, 138 | and can't be installed while this script is running. Please 139 | install a more recent version first, using 140 | 'easy_install -U setuptools'. 141 | 142 | (Currently using {VC_err.args[0]!r}) 143 | """).format(VC_err=VC_err, version=version) 144 | sys.stderr.write(msg) 145 | sys.exit(2) 146 | 147 | # otherwise, reload ok 148 | del pkg_resources, sys.modules['pkg_resources'] 149 | return _do_download(version, download_base, to_dir, download_delay) 150 | 151 | def _clean_check(cmd, target): 152 | """ 153 | Run the command to download target. If the command fails, clean up before 154 | re-raising the error. 155 | """ 156 | try: 157 | subprocess.check_call(cmd) 158 | except subprocess.CalledProcessError: 159 | if os.access(target, os.F_OK): 160 | os.unlink(target) 161 | raise 162 | 163 | def download_file_powershell(url, target): 164 | """ 165 | Download the file at url to target using Powershell (which will validate 166 | trust). Raise an exception if the command cannot complete. 167 | """ 168 | target = os.path.abspath(target) 169 | cmd = [ 170 | 'powershell', 171 | '-Command', 172 | "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" % vars(), 173 | ] 174 | _clean_check(cmd, target) 175 | 176 | def has_powershell(): 177 | if platform.system() != 'Windows': 178 | return False 179 | cmd = ['powershell', '-Command', 'echo test'] 180 | devnull = open(os.path.devnull, 'wb') 181 | try: 182 | try: 183 | subprocess.check_call(cmd, stdout=devnull, stderr=devnull) 184 | except Exception: 185 | return False 186 | finally: 187 | devnull.close() 188 | return True 189 | 190 | download_file_powershell.viable = has_powershell 191 | 192 | def download_file_curl(url, target): 193 | cmd = ['curl', url, '--silent', '--output', target] 194 | _clean_check(cmd, target) 195 | 196 | def has_curl(): 197 | cmd = ['curl', '--version'] 198 | devnull = open(os.path.devnull, 'wb') 199 | try: 200 | try: 201 | subprocess.check_call(cmd, stdout=devnull, stderr=devnull) 202 | except Exception: 203 | return False 204 | finally: 205 | devnull.close() 206 | return True 207 | 208 | download_file_curl.viable = has_curl 209 | 210 | def download_file_wget(url, target): 211 | cmd = ['wget', url, '--quiet', '--output-document', target] 212 | _clean_check(cmd, target) 213 | 214 | def has_wget(): 215 | cmd = ['wget', '--version'] 216 | devnull = open(os.path.devnull, 'wb') 217 | try: 218 | try: 219 | subprocess.check_call(cmd, stdout=devnull, stderr=devnull) 220 | except Exception: 221 | return False 222 | finally: 223 | devnull.close() 224 | return True 225 | 226 | download_file_wget.viable = has_wget 227 | 228 | def download_file_insecure(url, target): 229 | """ 230 | Use Python to download the file, even though it cannot authenticate the 231 | connection. 232 | """ 233 | try: 234 | from urllib.request import urlopen 235 | except ImportError: 236 | from urllib2 import urlopen 237 | src = dst = None 238 | try: 239 | src = urlopen(url) 240 | # Read/write all in one block, so we don't create a corrupt file 241 | # if the download is interrupted. 242 | data = src.read() 243 | dst = open(target, "wb") 244 | dst.write(data) 245 | finally: 246 | if src: 247 | src.close() 248 | if dst: 249 | dst.close() 250 | 251 | download_file_insecure.viable = lambda: True 252 | 253 | def get_best_downloader(): 254 | downloaders = [ 255 | download_file_powershell, 256 | download_file_curl, 257 | download_file_wget, 258 | download_file_insecure, 259 | ] 260 | 261 | for dl in downloaders: 262 | if dl.viable(): 263 | return dl 264 | 265 | def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, 266 | to_dir=os.curdir, delay=15, downloader_factory=get_best_downloader): 267 | """ 268 | Download setuptools from a specified location and return its filename 269 | 270 | `version` should be a valid setuptools version number that is available 271 | as an egg for download under the `download_base` URL (which should end 272 | with a '/'). `to_dir` is the directory where the egg will be downloaded. 273 | `delay` is the number of seconds to pause before an actual download 274 | attempt. 275 | 276 | ``downloader_factory`` should be a function taking no arguments and 277 | returning a function for downloading a URL to a target. 278 | """ 279 | # making sure we use the absolute path 280 | to_dir = os.path.abspath(to_dir) 281 | zip_name = "setuptools-%s.zip" % version 282 | url = download_base + zip_name 283 | saveto = os.path.join(to_dir, zip_name) 284 | if not os.path.exists(saveto): # Avoid repeated downloads 285 | log.warn("Downloading %s", url) 286 | downloader = downloader_factory() 287 | downloader(url, saveto) 288 | return os.path.realpath(saveto) 289 | 290 | def _build_install_args(options): 291 | """ 292 | Build the arguments to 'python setup.py install' on the setuptools package 293 | """ 294 | return ['--user'] if options.user_install else [] 295 | 296 | def _parse_args(): 297 | """ 298 | Parse the command line for options 299 | """ 300 | parser = optparse.OptionParser() 301 | parser.add_option( 302 | '--user', dest='user_install', action='store_true', default=False, 303 | help='install in user site package (requires Python 2.6 or later)') 304 | parser.add_option( 305 | '--download-base', dest='download_base', metavar="URL", 306 | default=DEFAULT_URL, 307 | help='alternative URL from where to download the setuptools package') 308 | parser.add_option( 309 | '--insecure', dest='downloader_factory', action='store_const', 310 | const=lambda: download_file_insecure, default=get_best_downloader, 311 | help='Use internal, non-validating downloader' 312 | ) 313 | parser.add_option( 314 | '--version', help="Specify which version to download", 315 | default=DEFAULT_VERSION, 316 | ) 317 | options, args = parser.parse_args() 318 | # positional arguments are ignored 319 | return options 320 | 321 | def main(): 322 | """Install or upgrade setuptools and EasyInstall""" 323 | options = _parse_args() 324 | archive = download_setuptools( 325 | version=options.version, 326 | download_base=options.download_base, 327 | downloader_factory=options.downloader_factory, 328 | ) 329 | return _install(archive, _build_install_args(options)) 330 | 331 | if __name__ == '__main__': 332 | sys.exit(main()) 333 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | try: 2 | # Try using ez_setup to install setuptools if not already installed. 3 | from ez_setup import use_setuptools 4 | use_setuptools() 5 | except ImportError: 6 | # Ignore import error and assume Python 3 which already has setuptools. 7 | pass 8 | 9 | from setuptools import setup, find_packages 10 | 11 | classifiers = ['Development Status :: 4 - Beta', 12 | 'Operating System :: POSIX :: Linux', 13 | 'License :: OSI Approved :: MIT License', 14 | 'Intended Audience :: Developers', 15 | 'Programming Language :: Python :: 2.7', 16 | 'Programming Language :: Python :: 3', 17 | 'Topic :: Software Development', 18 | 'Topic :: System :: Hardware'] 19 | 20 | setup(name = 'Adafruit_ADS1x15', 21 | version = '1.0.2', 22 | author = 'Tony DiCola', 23 | author_email = 'tdicola@adafruit.com', 24 | description = 'Python code to use the ADS1015 and ADS1115 analog to digital converters with a Raspberry Pi or BeagleBone black.', 25 | license = 'MIT', 26 | classifiers = classifiers, 27 | url = 'https://github.com/adafruit/Adafruit_Python_ADS1x15/', 28 | dependency_links = ['https://github.com/adafruit/Adafruit_Python_GPIO/tarball/master#egg=Adafruit-GPIO-0.6.5'], 29 | install_requires = ['Adafruit-GPIO>=0.6.5'], 30 | packages = find_packages()) 31 | --------------------------------------------------------------------------------