├── .gitattributes ├── .github ├── PULL_REQUEST_TEMPLATE │ └── adafruit_circuitpython_pr.md └── workflows │ ├── build.yml │ ├── failure-help-text.yml │ ├── release_gh.yml │ └── release_pypi.yml ├── .gitignore ├── .pre-commit-config.yaml ├── .readthedocs.yaml ├── CODE_OF_CONDUCT.md ├── LICENSE ├── LICENSES ├── CC-BY-4.0.txt ├── MIT.txt └── Unlicense.txt ├── README.rst ├── README.rst.license ├── adafruit_max31865.py ├── docs ├── _static │ ├── favicon.ico │ └── favicon.ico.license ├── api.rst ├── api.rst.license ├── conf.py ├── examples.rst ├── examples.rst.license ├── index.rst ├── index.rst.license └── requirements.txt ├── examples └── max31865_simpletest.py ├── optional_requirements.txt ├── pyproject.toml ├── requirements.txt └── ruff.toml /.gitattributes: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Justin Myers for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | .py text eol=lf 6 | .rst text eol=lf 7 | .txt text eol=lf 8 | .yaml text eol=lf 9 | .toml text eol=lf 10 | .license text eol=lf 11 | .md text eol=lf 12 | -------------------------------------------------------------------------------- /.github/PULL_REQUEST_TEMPLATE/adafruit_circuitpython_pr.md: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | Thank you for contributing! Before you submit a pull request, please read the following. 6 | 7 | Make sure any changes you're submitting are in line with the CircuitPython Design Guide, available here: https://docs.circuitpython.org/en/latest/docs/design_guide.html 8 | 9 | If your changes are to documentation, please verify that the documentation builds locally by following the steps found here: https://adafru.it/build-docs 10 | 11 | Before submitting the pull request, make sure you've run Pylint and Black locally on your code. You can do this manually or using pre-commit. Instructions are available here: https://adafru.it/check-your-code 12 | 13 | Please remove all of this text before submitting. Include an explanation or list of changes included in your PR, as well as, if applicable, a link to any related issues. 14 | -------------------------------------------------------------------------------- /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: Build CI 6 | 7 | on: [pull_request, push] 8 | 9 | jobs: 10 | test: 11 | runs-on: ubuntu-latest 12 | steps: 13 | - name: Run Build CI workflow 14 | uses: adafruit/workflows-circuitpython-libs/build@main 15 | -------------------------------------------------------------------------------- /.github/workflows/failure-help-text.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Scott Shawcroft for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: Failure help text 6 | 7 | on: 8 | workflow_run: 9 | workflows: ["Build CI"] 10 | types: 11 | - completed 12 | 13 | jobs: 14 | post-help: 15 | runs-on: ubuntu-latest 16 | if: ${{ github.event.workflow_run.conclusion == 'failure' && github.event.workflow_run.event == 'pull_request' }} 17 | steps: 18 | - name: Post comment to help 19 | uses: adafruit/circuitpython-action-library-ci-failed@v1 20 | -------------------------------------------------------------------------------- /.github/workflows/release_gh.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: GitHub Release Actions 6 | 7 | on: 8 | release: 9 | types: [published] 10 | 11 | jobs: 12 | upload-release-assets: 13 | runs-on: ubuntu-latest 14 | steps: 15 | - name: Run GitHub Release CI workflow 16 | uses: adafruit/workflows-circuitpython-libs/release-gh@main 17 | with: 18 | github-token: ${{ secrets.GITHUB_TOKEN }} 19 | upload-url: ${{ github.event.release.upload_url }} 20 | -------------------------------------------------------------------------------- /.github/workflows/release_pypi.yml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | name: PyPI Release Actions 6 | 7 | on: 8 | release: 9 | types: [published] 10 | 11 | jobs: 12 | upload-release-assets: 13 | runs-on: ubuntu-latest 14 | steps: 15 | - name: Run PyPI Release CI workflow 16 | uses: adafruit/workflows-circuitpython-libs/release-pypi@main 17 | with: 18 | pypi-username: ${{ secrets.pypi_username }} 19 | pypi-password: ${{ secrets.pypi_password }} 20 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Kattni Rembor, written for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | # Do not include files and directories created by your personal work environment, such as the IDE 6 | # you use, except for those already listed here. Pull requests including changes to this file will 7 | # not be accepted. 8 | 9 | # This .gitignore file contains rules for files generated by working with CircuitPython libraries, 10 | # including building Sphinx, testing with pip, and creating a virual environment, as well as the 11 | # MacOS and IDE-specific files generated by using MacOS in general, or the PyCharm or VSCode IDEs. 12 | 13 | # If you find that there are files being generated on your machine that should not be included in 14 | # your git commit, you should create a .gitignore_global file on your computer to include the 15 | # files created by your personal setup. To do so, follow the two steps below. 16 | 17 | # First, create a file called .gitignore_global somewhere convenient for you, and add rules for 18 | # the files you want to exclude from git commits. 19 | 20 | # Second, configure Git to use the exclude file for all Git repositories by running the 21 | # following via commandline, replacing "path/to/your/" with the actual path to your newly created 22 | # .gitignore_global file: 23 | # git config --global core.excludesfile path/to/your/.gitignore_global 24 | 25 | # CircuitPython-specific files 26 | *.mpy 27 | 28 | # Python-specific files 29 | __pycache__ 30 | *.pyc 31 | 32 | # Sphinx build-specific files 33 | _build 34 | 35 | # This file results from running `pip -e install .` in a local repository 36 | *.egg-info 37 | 38 | # Virtual environment-specific files 39 | .env 40 | .venv 41 | 42 | # MacOS-specific files 43 | *.DS_Store 44 | 45 | # IDE-specific files 46 | .idea 47 | .vscode 48 | *~ 49 | -------------------------------------------------------------------------------- /.pre-commit-config.yaml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Justin Myers for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | repos: 6 | - repo: https://github.com/pre-commit/pre-commit-hooks 7 | rev: v4.5.0 8 | hooks: 9 | - id: check-yaml 10 | - id: end-of-file-fixer 11 | - id: trailing-whitespace 12 | - repo: https://github.com/astral-sh/ruff-pre-commit 13 | rev: v0.3.4 14 | hooks: 15 | - id: ruff-format 16 | - id: ruff 17 | args: ["--fix"] 18 | - repo: https://github.com/fsfe/reuse-tool 19 | rev: v3.0.1 20 | hooks: 21 | - id: reuse 22 | -------------------------------------------------------------------------------- /.readthedocs.yaml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | # Read the Docs configuration file 6 | # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details 7 | 8 | # Required 9 | version: 2 10 | 11 | sphinx: 12 | configuration: docs/conf.py 13 | 14 | build: 15 | os: ubuntu-20.04 16 | tools: 17 | python: "3" 18 | 19 | python: 20 | install: 21 | - requirements: docs/requirements.txt 22 | - requirements: requirements.txt 23 | -------------------------------------------------------------------------------- /CODE_OF_CONDUCT.md: -------------------------------------------------------------------------------- 1 | 6 | 7 | # Adafruit Community Code of Conduct 8 | 9 | ## Our Pledge 10 | 11 | In the interest of fostering an open and welcoming environment, we as 12 | contributors and leaders pledge to making participation in our project and 13 | our community a harassment-free experience for everyone, regardless of age, body 14 | size, disability, ethnicity, gender identity and expression, level or type of 15 | experience, education, socio-economic status, nationality, personal appearance, 16 | race, religion, or sexual identity and orientation. 17 | 18 | ## Our Standards 19 | 20 | We are committed to providing a friendly, safe and welcoming environment for 21 | all. 22 | 23 | Examples of behavior that contributes to creating a positive environment 24 | include: 25 | 26 | * Be kind and courteous to others 27 | * Using welcoming and inclusive language 28 | * Being respectful of differing viewpoints and experiences 29 | * Collaborating with other community members 30 | * Gracefully accepting constructive criticism 31 | * Focusing on what is best for the community 32 | * Showing empathy towards other community members 33 | 34 | Examples of unacceptable behavior by participants include: 35 | 36 | * The use of sexualized language or imagery and sexual attention or advances 37 | * The use of inappropriate images, including in a community member's avatar 38 | * The use of inappropriate language, including in a community member's nickname 39 | * Any spamming, flaming, baiting or other attention-stealing behavior 40 | * Excessive or unwelcome helping; answering outside the scope of the question 41 | asked 42 | * Trolling, insulting/derogatory comments, and personal or political attacks 43 | * Promoting or spreading disinformation, lies, or conspiracy theories against 44 | a person, group, organisation, project, or community 45 | * Public or private harassment 46 | * Publishing others' private information, such as a physical or electronic 47 | address, without explicit permission 48 | * Other conduct which could reasonably be considered inappropriate 49 | 50 | The goal of the standards and moderation guidelines outlined here is to build 51 | and maintain a respectful community. 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IN NO EVENT SHALL THE AUTHORS 17 | OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 18 | WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF 19 | OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 20 | -------------------------------------------------------------------------------- /LICENSES/Unlicense.txt: -------------------------------------------------------------------------------- 1 | This is free and unencumbered software released into the public domain. 2 | 3 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute 4 | this software, either in source code form or as a compiled binary, for any 5 | purpose, commercial or non-commercial, and by any means. 6 | 7 | In jurisdictions that recognize copyright laws, the author or authors of this 8 | software dedicate any and all copyright interest in the software to the public 9 | domain. We make this dedication for the benefit of the public at large and 10 | to the detriment of our heirs and successors. We intend this dedication to 11 | be an overt act of relinquishment in perpetuity of all present and future 12 | rights to this software under copyright law. 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, FITNESS 16 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS 17 | BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 18 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 19 | THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. For more information, 20 | please refer to 21 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | 2 | Introduction 3 | ============ 4 | 5 | .. image:: https://readthedocs.org/projects/adafruit-circuitpython-max31865/badge/?version=latest 6 | :target: https://docs.circuitpython.org/projects/max31865/en/latest/ 7 | :alt: Documentation Status 8 | 9 | .. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg 10 | :target: https://adafru.it/discord 11 | :alt: Discord 12 | 13 | .. image:: https://github.com/adafruit/Adafruit_CircuitPython_MAX31865/workflows/Build%20CI/badge.svg 14 | :target: https://github.com/adafruit/Adafruit_CircuitPython_MAX31865/actions/ 15 | :alt: Build Status 16 | 17 | .. image:: https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json 18 | :target: https://github.com/astral-sh/ruff 19 | :alt: Code Style: Ruff 20 | 21 | CircuitPython module for the MAX31865 thermocouple amplifier. 22 | 23 | Dependencies 24 | ============= 25 | This driver depends on: 26 | 27 | * `Adafruit CircuitPython `_ 28 | * `Bus Device `_ 29 | 30 | Please ensure all dependencies are available on the CircuitPython filesystem. 31 | This is easily achieved by downloading 32 | `the Adafruit library and driver bundle `_. 33 | 34 | Installing from PyPI 35 | ===================== 36 | On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from 37 | PyPI `_. To install for current user: 38 | 39 | .. code-block:: shell 40 | 41 | pip3 install adafruit-circuitpython-max31865 42 | 43 | To install system-wide (this may be required in some cases): 44 | 45 | .. code-block:: shell 46 | 47 | sudo pip3 install adafruit-circuitpython-max31865 48 | 49 | To install in a virtual environment in your current project: 50 | 51 | .. code-block:: shell 52 | 53 | mkdir project-name && cd project-name 54 | python3 -m venv .venv 55 | source .venv/bin/activate 56 | pip3 install adafruit-circuitpython-max31865 57 | 58 | 59 | Usage Example 60 | ============= 61 | 62 | See examples/max31865_simpletest.py for a demo of the usage. 63 | 64 | Documentation 65 | ============= 66 | 67 | API documentation for this library can be found on `Read the Docs `_. 68 | 69 | For information on building library documentation, please check out `this guide `_. 70 | 71 | Contributing 72 | ============ 73 | 74 | Contributions are welcome! Please read our `Code of Conduct 75 | `_ 76 | before contributing to help this project stay welcoming. 77 | -------------------------------------------------------------------------------- /README.rst.license: -------------------------------------------------------------------------------- 1 | SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries 2 | 3 | SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /adafruit_max31865.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | """ 6 | `adafruit_max31865` 7 | ==================================================== 8 | 9 | CircuitPython module for the MAX31865 platinum RTD temperature sensor. See 10 | examples/simpletest.py for an example of the usage. 11 | 12 | * Author(s): Tony DiCola 13 | 14 | Implementation Notes 15 | -------------------- 16 | 17 | **Hardware:** 18 | 19 | * Adafruit `Universal Thermocouple Amplifier MAX31856 Breakout 20 | `_ (Product ID: 3263) 21 | 22 | * Adafruit `PT100 RTD Temperature Sensor Amplifier - MAX31865 23 | `_ (Product ID: 3328) 24 | 25 | * Adafruit `PT1000 RTD Temperature Sensor Amplifier - MAX31865 26 | `_ (Product ID: 3648) 27 | 28 | **Software and Dependencies:** 29 | 30 | * Adafruit CircuitPython firmware for the supported boards: 31 | https://circuitpython.org/downloads 32 | 33 | * Adafruit's Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice 34 | """ 35 | 36 | import math 37 | import time 38 | 39 | from adafruit_bus_device import spi_device 40 | from micropython import const 41 | 42 | __version__ = "0.0.0+auto.0" 43 | __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_MAX31865.git" 44 | 45 | # Register and other constant values: 46 | _MAX31865_CONFIG_REG = const(0x00) 47 | _MAX31865_CONFIG_BIAS = const(0x80) 48 | _MAX31865_CONFIG_MODEAUTO = const(0x40) 49 | _MAX31865_CONFIG_MODEOFF = const(0x00) 50 | _MAX31865_CONFIG_1SHOT = const(0x20) 51 | _MAX31865_CONFIG_3WIRE = const(0x10) 52 | _MAX31865_CONFIG_24WIRE = const(0x00) 53 | _MAX31865_CONFIG_FAULTSTAT = const(0x02) 54 | _MAX31865_CONFIG_FILT50HZ = const(0x01) 55 | _MAX31865_CONFIG_FILT60HZ = const(0x00) 56 | _MAX31865_RTDMSB_REG = const(0x01) 57 | _MAX31865_RTDLSB_REG = const(0x02) 58 | _MAX31865_HFAULTMSB_REG = const(0x03) 59 | _MAX31865_HFAULTLSB_REG = const(0x04) 60 | _MAX31865_LFAULTMSB_REG = const(0x05) 61 | _MAX31865_LFAULTLSB_REG = const(0x06) 62 | _MAX31865_FAULTSTAT_REG = const(0x07) 63 | _MAX31865_FAULT_HIGHTHRESH = const(0x80) 64 | _MAX31865_FAULT_LOWTHRESH = const(0x40) 65 | _MAX31865_FAULT_REFINLOW = const(0x20) 66 | _MAX31865_FAULT_REFINHIGH = const(0x10) 67 | _MAX31865_FAULT_RTDINLOW = const(0x08) 68 | _MAX31865_FAULT_OVUV = const(0x04) 69 | _RTD_A = 3.9083e-3 70 | _RTD_B = -5.775e-7 71 | 72 | 73 | class MAX31865: 74 | """Driver for the MAX31865 thermocouple amplifier. 75 | 76 | :param ~busio.SPI spi: SPI device 77 | :param ~digitalio.DigitalInOut cs: Chip Select 78 | :param int rtd_nominal: RTD nominal value. Defaults to :const:`100` 79 | :param int ref_resistor: Reference resistance. Defaults to :const:`430.0` 80 | :param int wires: Number of wires. Defaults to :const:`2` 81 | :param int filter_frequency: . Filter frequency. Default to :const:`60` 82 | :param int polarity: set to 1 if controller clock idles high. Default 0. 83 | 84 | 85 | **Quickstart: Importing and using the MAX31865** 86 | 87 | Here is an example of using the :class:`MAX31865` class. 88 | First you will need to import the libraries to use the sensor 89 | 90 | .. code-block:: python 91 | 92 | import board 93 | from digitalio import DigitalInOut, Direction 94 | import adafruit_max31865 95 | 96 | Once this is done you can define your `board.SPI` object and define your sensor object 97 | 98 | .. code-block:: python 99 | 100 | spi = board.SPI() 101 | cs = digitalio.DigitalInOut(board.D5) # Chip select of the MAX31865 board. 102 | sensor = adafruit_max31865.MAX31865(spi, cs) 103 | 104 | 105 | Now you have access to the :attr:`temperature` attribute 106 | 107 | .. code-block:: python 108 | 109 | temperature = sensor.temperature 110 | 111 | 112 | """ 113 | 114 | # Class-level buffer for reading and writing data with the sensor. 115 | # This reduces memory allocations but means the code is not re-entrant or 116 | # thread safe! 117 | _BUFFER = bytearray(3) 118 | 119 | def __init__( 120 | self, 121 | spi, 122 | cs, 123 | *, 124 | polarity=0, 125 | rtd_nominal=100, 126 | ref_resistor=430.0, 127 | wires=2, 128 | filter_frequency=60, 129 | ): 130 | self.rtd_nominal = rtd_nominal 131 | self.ref_resistor = ref_resistor 132 | self._device = spi_device.SPIDevice(spi, cs, baudrate=500000, polarity=polarity, phase=1) 133 | # Set 50Hz or 60Hz filter. 134 | if filter_frequency not in {50, 60}: 135 | raise ValueError("Filter_frequency must be a value of 50 or 60!") 136 | config = self._read_u8(_MAX31865_CONFIG_REG) 137 | if filter_frequency == 50: 138 | config |= _MAX31865_CONFIG_FILT50HZ 139 | else: 140 | config &= ~_MAX31865_CONFIG_FILT50HZ 141 | 142 | # Set wire config register based on the number of wires specified. 143 | if wires not in {2, 3, 4}: 144 | raise ValueError("Wires must be a value of 2, 3, or 4!") 145 | if wires == 3: 146 | config |= _MAX31865_CONFIG_3WIRE 147 | else: 148 | # 2 or 4 wire 149 | config &= ~_MAX31865_CONFIG_3WIRE 150 | self._write_u8(_MAX31865_CONFIG_REG, config) 151 | # Default to no bias and no auto conversion. 152 | self.bias = False 153 | self.auto_convert = False 154 | 155 | def _read_u8(self, address): 156 | # Read an 8-bit unsigned value from the specified 8-bit address. 157 | with self._device as device: 158 | self._BUFFER[0] = address & 0x7F 159 | device.write(self._BUFFER, end=1) 160 | device.readinto(self._BUFFER, end=1) 161 | return self._BUFFER[0] 162 | 163 | def _read_u16(self, address): 164 | # Read a 16-bit BE unsigned value from the specified 8-bit address. 165 | with self._device as device: 166 | self._BUFFER[0] = address & 0x7F 167 | device.write(self._BUFFER, end=1) 168 | device.readinto(self._BUFFER, end=2) 169 | return (self._BUFFER[0] << 8) | self._BUFFER[1] 170 | 171 | def _write_u8(self, address, val): 172 | # Write an 8-bit unsigned value to the specified 8-bit address. 173 | with self._device as device: 174 | self._BUFFER[0] = (address | 0x80) & 0xFF 175 | self._BUFFER[1] = val & 0xFF 176 | device.write(self._BUFFER, end=2) 177 | 178 | @property 179 | def bias(self): 180 | """The state of the sensor's bias (True/False).""" 181 | return bool(self._read_u8(_MAX31865_CONFIG_REG) & _MAX31865_CONFIG_BIAS) 182 | 183 | @bias.setter 184 | def bias(self, val): 185 | config = self._read_u8(_MAX31865_CONFIG_REG) 186 | if val: 187 | config |= _MAX31865_CONFIG_BIAS # Enable bias. 188 | else: 189 | config &= ~_MAX31865_CONFIG_BIAS # Disable bias. 190 | self._write_u8(_MAX31865_CONFIG_REG, config) 191 | 192 | @property 193 | def auto_convert(self): 194 | """The state of the sensor's automatic conversion 195 | mode (True/False). 196 | """ 197 | return bool(self._read_u8(_MAX31865_CONFIG_REG) & _MAX31865_CONFIG_MODEAUTO) 198 | 199 | @auto_convert.setter 200 | def auto_convert(self, val): 201 | config = self._read_u8(_MAX31865_CONFIG_REG) 202 | if val: 203 | config |= _MAX31865_CONFIG_MODEAUTO # Enable auto convert. 204 | config |= _MAX31865_CONFIG_BIAS # Enable bias. 205 | else: 206 | config &= ~_MAX31865_CONFIG_MODEAUTO # Disable auto convert. 207 | config &= ~_MAX31865_CONFIG_BIAS # Disable bias. 208 | self._write_u8(_MAX31865_CONFIG_REG, config) 209 | 210 | @property 211 | def fault(self): 212 | """The fault state of the sensor. Use :meth:`clear_faults` to clear the 213 | fault state. Returns a 6-tuple of boolean values which indicate if any 214 | faults are present: 215 | 216 | - HIGHTHRESH 217 | - LOWTHRESH 218 | - REFINLOW 219 | - REFINHIGH 220 | - RTDINLOW 221 | - OVUV 222 | """ 223 | faults = self._read_u8(_MAX31865_FAULTSTAT_REG) 224 | highthresh = bool(faults & _MAX31865_FAULT_HIGHTHRESH) 225 | lowthresh = bool(faults & _MAX31865_FAULT_LOWTHRESH) 226 | refinlow = bool(faults & _MAX31865_FAULT_REFINLOW) 227 | refinhigh = bool(faults & _MAX31865_FAULT_REFINHIGH) 228 | rtdinlow = bool(faults & _MAX31865_FAULT_RTDINLOW) 229 | ovuv = bool(faults & _MAX31865_FAULT_OVUV) 230 | return (highthresh, lowthresh, refinlow, refinhigh, rtdinlow, ovuv) 231 | 232 | def clear_faults(self): 233 | """Clear any fault state previously detected by the sensor.""" 234 | config = self._read_u8(_MAX31865_CONFIG_REG) 235 | config &= ~0x2C 236 | config |= _MAX31865_CONFIG_FAULTSTAT 237 | self._write_u8(_MAX31865_CONFIG_REG, config) 238 | 239 | def read_rtd(self): 240 | """Perform a raw reading of the thermocouple and return its 15-bit 241 | value. You'll need to manually convert this to temperature using the 242 | nominal value of the resistance-to-digital conversion and some math. If you just want 243 | temperature use the temperature property instead. 244 | """ 245 | if self.auto_convert: 246 | rtd = self._read_u16(_MAX31865_RTDMSB_REG) 247 | if not rtd & 1: 248 | rtd >>= 1 249 | return rtd 250 | self.clear_faults() 251 | self.bias = True 252 | time.sleep(0.01) 253 | config = self._read_u8(_MAX31865_CONFIG_REG) 254 | config |= _MAX31865_CONFIG_1SHOT 255 | self._write_u8(_MAX31865_CONFIG_REG, config) 256 | time.sleep(0.065) 257 | rtd = self._read_u16(_MAX31865_RTDMSB_REG) 258 | self.bias = False 259 | # Remove fault bit. 260 | rtd >>= 1 261 | return rtd 262 | 263 | @property 264 | def resistance(self): 265 | """Read the resistance of the RTD and return its value in Ohms.""" 266 | resistance = self.read_rtd() 267 | resistance /= 32768 268 | resistance *= self.ref_resistor 269 | return resistance 270 | 271 | @property 272 | def temperature(self): 273 | """Read the temperature of the sensor and return its value in degrees 274 | Celsius. 275 | """ 276 | # This math originates from: 277 | # http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf 278 | # To match the naming from the app note we tell lint to ignore the Z1-4 279 | # naming. 280 | raw_reading = self.resistance 281 | Z1 = -_RTD_A 282 | Z2 = _RTD_A * _RTD_A - (4 * _RTD_B) 283 | Z3 = (4 * _RTD_B) / self.rtd_nominal 284 | Z4 = 2 * _RTD_B 285 | temp = Z2 + (Z3 * raw_reading) 286 | temp = (math.sqrt(temp) + Z1) / Z4 287 | if temp >= 0: 288 | return temp 289 | 290 | # For the following math to work, nominal RTD resistance must be normalized to 100 ohms 291 | raw_reading /= self.rtd_nominal 292 | raw_reading *= 100 293 | 294 | rpoly = raw_reading 295 | temp = -242.02 296 | temp += 2.2228 * rpoly 297 | rpoly *= raw_reading # square 298 | temp += 2.5859e-3 * rpoly 299 | rpoly *= raw_reading # ^3 300 | temp -= 4.8260e-6 * rpoly 301 | rpoly *= raw_reading # ^4 302 | temp -= 2.8183e-8 * rpoly 303 | rpoly *= raw_reading # ^5 304 | temp += 1.5243e-10 * rpoly 305 | return temp 306 | -------------------------------------------------------------------------------- /docs/_static/favicon.ico: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_MAX31865/346eac4154acd135d0c1761aa0cdfd2426ad1417/docs/_static/favicon.ico -------------------------------------------------------------------------------- /docs/_static/favicon.ico.license: -------------------------------------------------------------------------------- 1 | SPDX-FileCopyrightText: 2018 Phillip Torrone for Adafruit Industries 2 | 3 | SPDX-License-Identifier: CC-BY-4.0 4 | -------------------------------------------------------------------------------- /docs/api.rst: -------------------------------------------------------------------------------- 1 | 2 | .. If you created a package, create one automodule per module in the package. 3 | 4 | API Reference 5 | ############# 6 | 7 | .. automodule:: adafruit_max31865 8 | :members: 9 | -------------------------------------------------------------------------------- /docs/api.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /docs/conf.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | import datetime 6 | import os 7 | import sys 8 | 9 | sys.path.insert(0, os.path.abspath("..")) 10 | 11 | # -- General configuration ------------------------------------------------ 12 | 13 | # Add any Sphinx extension module names here, as strings. They can be 14 | # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom 15 | # ones. 16 | extensions = [ 17 | "sphinx.ext.autodoc", 18 | "sphinxcontrib.jquery", 19 | "sphinx.ext.intersphinx", 20 | "sphinx.ext.viewcode", 21 | ] 22 | 23 | 24 | # Uncomment the below if you use native CircuitPython modules such as 25 | # digitalio, micropython and busio. List the modules you use. Without it, the 26 | # autodoc module docs will fail to generate with a warning. 27 | # autodoc_mock_imports = ["micropython", "adafruit_bus_device"] 28 | 29 | intersphinx_mapping = { 30 | "python": ("https://docs.python.org/3", None), 31 | "BusDevice": ( 32 | "https://docs.circuitpython.org/projects/busdevice/en/latest/", 33 | None, 34 | ), 35 | "CircuitPython": ("https://docs.circuitpython.org/en/latest/", None), 36 | } 37 | 38 | # Add any paths that contain templates here, relative to this directory. 39 | templates_path = ["_templates"] 40 | 41 | source_suffix = ".rst" 42 | 43 | # The master toctree document. 44 | master_doc = "index" 45 | 46 | # General information about the project. 47 | project = "Adafruit MAX31865 Library" 48 | creation_year = "2017" 49 | current_year = str(datetime.datetime.now().year) 50 | year_duration = ( 51 | current_year if current_year == creation_year else creation_year + " - " + current_year 52 | ) 53 | copyright = year_duration + " Tony DiCola" 54 | author = "Tony DiCola" 55 | 56 | # The version info for the project you're documenting, acts as replacement for 57 | # |version| and |release|, also used in various other places throughout the 58 | # built documents. 59 | # 60 | # The short X.Y version. 61 | version = "1.0" 62 | # The full version, including alpha/beta/rc tags. 63 | release = "1.0" 64 | 65 | # The language for content autogenerated by Sphinx. Refer to documentation 66 | # for a list of supported languages. 67 | # 68 | # This is also used if you do content translation via gettext catalogs. 69 | # Usually you set "language" from the command line for these cases. 70 | language = "en" 71 | 72 | # List of patterns, relative to source directory, that match files and 73 | # directories to ignore when looking for source files. 74 | # This patterns also effect to html_static_path and html_extra_path 75 | exclude_patterns = ["_build", "Thumbs.db", ".DS_Store", ".env", "CODE_OF_CONDUCT.md"] 76 | 77 | # The reST default role (used for this markup: `text`) to use for all 78 | # documents. 79 | # 80 | default_role = "any" 81 | 82 | # If true, '()' will be appended to :func: etc. cross-reference text. 83 | # 84 | add_function_parentheses = True 85 | 86 | # The name of the Pygments (syntax highlighting) style to use. 87 | pygments_style = "sphinx" 88 | 89 | # If true, `todo` and `todoList` produce output, else they produce nothing. 90 | todo_include_todos = False 91 | 92 | # If this is True, todo emits a warning for each TODO entries. The default is False. 93 | todo_emit_warnings = True 94 | 95 | 96 | # -- Options for HTML output ---------------------------------------------- 97 | 98 | # The theme to use for HTML and HTML Help pages. See the documentation for 99 | # a list of builtin themes. 100 | # 101 | import sphinx_rtd_theme 102 | 103 | html_theme = "sphinx_rtd_theme" 104 | 105 | # Add any paths that contain custom static files (such as style sheets) here, 106 | # relative to this directory. They are copied after the builtin static files, 107 | # so a file named "default.css" will overwrite the builtin "default.css". 108 | html_static_path = ["_static"] 109 | 110 | # The name of an image file (relative to this directory) to use as a favicon of 111 | # the docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32 112 | # pixels large. 113 | # 114 | html_favicon = "_static/favicon.ico" 115 | 116 | # Output file base name for HTML help builder. 117 | htmlhelp_basename = "AdafruitMAX31865Librarydoc" 118 | 119 | # -- Options for LaTeX output --------------------------------------------- 120 | 121 | latex_elements = { 122 | # The paper size ('letterpaper' or 'a4paper'). 123 | # 124 | # 'papersize': 'letterpaper', 125 | # The font size ('10pt', '11pt' or '12pt'). 126 | # 127 | # 'pointsize': '10pt', 128 | # Additional stuff for the LaTeX preamble. 129 | # 130 | # 'preamble': '', 131 | # Latex figure (float) alignment 132 | # 133 | # 'figure_align': 'htbp', 134 | } 135 | 136 | # Grouping the document tree into LaTeX files. List of tuples 137 | # (source start file, target name, title, 138 | # author, documentclass [howto, manual, or own class]). 139 | latex_documents = [ 140 | ( 141 | master_doc, 142 | "AdafruitMAX31865Library.tex", 143 | "Adafruit MAX31865 Library Documentation", 144 | author, 145 | "manual", 146 | ), 147 | ] 148 | 149 | # -- Options for manual page output --------------------------------------- 150 | 151 | # One entry per manual page. List of tuples 152 | # (source start file, name, description, authors, manual section). 153 | man_pages = [ 154 | ( 155 | master_doc, 156 | "adafruitMAX31865library", 157 | "Adafruit MAX31865 Library Documentation", 158 | [author], 159 | 1, 160 | ) 161 | ] 162 | 163 | # -- Options for Texinfo output ------------------------------------------- 164 | 165 | # Grouping the document tree into Texinfo files. List of tuples 166 | # (source start file, target name, title, author, 167 | # dir menu entry, description, category) 168 | texinfo_documents = [ 169 | ( 170 | master_doc, 171 | "AdafruitMAX31865Library", 172 | "Adafruit MAX31865 Library Documentation", 173 | author, 174 | "AdafruitMAX31865Library", 175 | "One line description of project.", 176 | "Miscellaneous", 177 | ), 178 | ] 179 | -------------------------------------------------------------------------------- /docs/examples.rst: -------------------------------------------------------------------------------- 1 | Simple test 2 | ------------ 3 | 4 | Ensure your device works with this simple test. 5 | 6 | .. literalinclude:: ../examples/max31865_simpletest.py 7 | :caption: examples/max31865_simpletest.py 8 | :linenos: 9 | -------------------------------------------------------------------------------- /docs/examples.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /docs/index.rst: -------------------------------------------------------------------------------- 1 | .. include:: ../README.rst 2 | 3 | Table of Contents 4 | ================= 5 | 6 | .. toctree:: 7 | :maxdepth: 4 8 | :hidden: 9 | 10 | self 11 | 12 | .. toctree:: 13 | :caption: Examples 14 | 15 | examples 16 | 17 | .. toctree:: 18 | :caption: API Reference 19 | :maxdepth: 3 20 | 21 | api 22 | 23 | .. toctree:: 24 | :caption: Tutorials 25 | 26 | Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 Learning Guide 27 | 28 | .. toctree:: 29 | :caption: Related Products 30 | 31 | Adafruit Universal Thermocouple Amplifier MAX31856 Breakout 32 | 33 | Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 34 | 35 | Adafruit PT1000 RTD Temperature Sensor Amplifier - MAX31865 36 | 37 | .. toctree:: 38 | :caption: Other Links 39 | 40 | Download from GitHub 41 | Download Library Bundle 42 | CircuitPython Reference Documentation 43 | CircuitPython Support Forum 44 | Discord Chat 45 | Adafruit Learning System 46 | Adafruit Blog 47 | Adafruit Store 48 | 49 | Indices and tables 50 | ================== 51 | 52 | * :ref:`genindex` 53 | * :ref:`modindex` 54 | * :ref:`search` 55 | -------------------------------------------------------------------------------- /docs/index.rst.license: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | -------------------------------------------------------------------------------- /docs/requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | sphinx 6 | sphinxcontrib-jquery 7 | sphinx-rtd-theme 8 | -------------------------------------------------------------------------------- /examples/max31865_simpletest.py: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries 2 | # SPDX-License-Identifier: MIT 3 | 4 | # Simple demo of the MAX31865 thermocouple amplifier. 5 | # Will print the temperature every second. 6 | import time 7 | 8 | import board 9 | import digitalio 10 | 11 | import adafruit_max31865 12 | 13 | # Create sensor object, communicating over the board's default SPI bus 14 | spi = board.SPI() 15 | cs = digitalio.DigitalInOut(board.D5) # Chip select of the MAX31865 board. 16 | sensor = adafruit_max31865.MAX31865(spi, cs) 17 | # Note you can optionally provide the thermocouple RTD nominal, the reference 18 | # resistance, and the number of wires for the sensor (2 the default, 3, or 4) 19 | # with keyword args: 20 | # sensor = adafruit_max31865.MAX31865(spi, cs, rtd_nominal=100, ref_resistor=430.0, wires=2) 21 | 22 | # Main loop to print the temperature every second. 23 | while True: 24 | # Read temperature. 25 | temp = sensor.temperature 26 | # Print the value. 27 | print(f"Temperature: {temp:0.3f}C") 28 | # Delay for a second. 29 | time.sleep(1.0) 30 | -------------------------------------------------------------------------------- /optional_requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | -------------------------------------------------------------------------------- /pyproject.toml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | [build-system] 6 | requires = [ 7 | "setuptools", 8 | "wheel", 9 | "setuptools-scm", 10 | ] 11 | 12 | [project] 13 | name = "adafruit-circuitpython-max31865" 14 | description = "CircuitPython library for MAX31865 thermocouple amplifier." 15 | version = "0.0.0+auto.0" 16 | readme = "README.rst" 17 | authors = [ 18 | {name = "Adafruit Industries", email = "circuitpython@adafruit.com"} 19 | ] 20 | urls = {Homepage = "https://github.com/adafruit/Adafruit_CircuitPython_MAX31865"} 21 | keywords = [ 22 | "adafruit", 23 | "max31865", 24 | "thermocouple", 25 | "amplifier", 26 | "breakout", 27 | "hardware", 28 | "micropython", 29 | "circuitpython", 30 | ] 31 | license = {text = "MIT"} 32 | classifiers = [ 33 | "Intended Audience :: Developers", 34 | "Topic :: Software Development :: Libraries", 35 | "Topic :: Software Development :: Embedded Systems", 36 | "Topic :: System :: Hardware", 37 | "License :: OSI Approved :: MIT License", 38 | "Programming Language :: Python :: 3", 39 | ] 40 | dynamic = ["dependencies", "optional-dependencies"] 41 | 42 | [tool.setuptools] 43 | py-modules = ["adafruit_max31865"] 44 | 45 | [tool.setuptools.dynamic] 46 | dependencies = {file = ["requirements.txt"]} 47 | optional-dependencies = {optional = {file = ["optional_requirements.txt"]}} 48 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: Unlicense 4 | 5 | Adafruit-Blinka 6 | adafruit-circuitpython-busdevice 7 | -------------------------------------------------------------------------------- /ruff.toml: -------------------------------------------------------------------------------- 1 | # SPDX-FileCopyrightText: 2024 Tim Cocks for Adafruit Industries 2 | # 3 | # SPDX-License-Identifier: MIT 4 | 5 | target-version = "py38" 6 | line-length = 100 7 | 8 | [lint] 9 | preview = true 10 | select = ["I", "PL", "UP"] 11 | 12 | extend-select = [ 13 | "D419", # empty-docstring 14 | "E501", # line-too-long 15 | "W291", # trailing-whitespace 16 | "PLC0414", # useless-import-alias 17 | "PLC2401", # non-ascii-name 18 | "PLC2801", # unnecessary-dunder-call 19 | "PLC3002", # unnecessary-direct-lambda-call 20 | "E999", # syntax-error 21 | "PLE0101", # return-in-init 22 | "F706", # return-outside-function 23 | "F704", # yield-outside-function 24 | "PLE0116", # continue-in-finally 25 | "PLE0117", # nonlocal-without-binding 26 | "PLE0241", # duplicate-bases 27 | "PLE0302", # unexpected-special-method-signature 28 | "PLE0604", # invalid-all-object 29 | "PLE0605", # invalid-all-format 30 | "PLE0643", # potential-index-error 31 | "PLE0704", # misplaced-bare-raise 32 | "PLE1141", # dict-iter-missing-items 33 | "PLE1142", # await-outside-async 34 | "PLE1205", # logging-too-many-args 35 | "PLE1206", # logging-too-few-args 36 | "PLE1307", # bad-string-format-type 37 | "PLE1310", # bad-str-strip-call 38 | "PLE1507", # invalid-envvar-value 39 | "PLE2502", # bidirectional-unicode 40 | "PLE2510", # invalid-character-backspace 41 | "PLE2512", # invalid-character-sub 42 | "PLE2513", # invalid-character-esc 43 | "PLE2514", # invalid-character-nul 44 | "PLE2515", # invalid-character-zero-width-space 45 | "PLR0124", # comparison-with-itself 46 | "PLR0202", # no-classmethod-decorator 47 | "PLR0203", # no-staticmethod-decorator 48 | "UP004", # useless-object-inheritance 49 | "PLR0206", # property-with-parameters 50 | "PLR0904", # too-many-public-methods 51 | "PLR0911", # too-many-return-statements 52 | "PLR0912", # too-many-branches 53 | "PLR0913", # too-many-arguments 54 | "PLR0914", # too-many-locals 55 | "PLR0915", # too-many-statements 56 | "PLR0916", # too-many-boolean-expressions 57 | "PLR1702", # too-many-nested-blocks 58 | "PLR1704", # redefined-argument-from-local 59 | "PLR1711", # useless-return 60 | "C416", # unnecessary-comprehension 61 | "PLR1733", # unnecessary-dict-index-lookup 62 | "PLR1736", # unnecessary-list-index-lookup 63 | 64 | # ruff reports this rule is unstable 65 | #"PLR6301", # no-self-use 66 | 67 | "PLW0108", # unnecessary-lambda 68 | "PLW0120", # useless-else-on-loop 69 | "PLW0127", # self-assigning-variable 70 | "PLW0129", # assert-on-string-literal 71 | "B033", # duplicate-value 72 | "PLW0131", # named-expr-without-context 73 | "PLW0245", # super-without-brackets 74 | "PLW0406", # import-self 75 | "PLW0602", # global-variable-not-assigned 76 | "PLW0603", # global-statement 77 | "PLW0604", # global-at-module-level 78 | 79 | # fails on the try: import typing used by libraries 80 | #"F401", # unused-import 81 | 82 | "F841", # unused-variable 83 | "E722", # bare-except 84 | "PLW0711", # binary-op-exception 85 | "PLW1501", # bad-open-mode 86 | "PLW1508", # invalid-envvar-default 87 | "PLW1509", # subprocess-popen-preexec-fn 88 | "PLW2101", # useless-with-lock 89 | "PLW3301", # nested-min-max 90 | ] 91 | 92 | ignore = [ 93 | "PLR2004", # magic-value-comparison 94 | "UP030", # format literals 95 | "PLW1514", # unspecified-encoding 96 | "PLR0913", # too-many-arguments 97 | "PLR0915", # too-many-statements 98 | "PLR0917", # too-many-positional-arguments 99 | "PLR0904", # too-many-public-methods 100 | "PLR0912", # too-many-branches 101 | "PLR0916", # too-many-boolean-expressions 102 | ] 103 | 104 | [format] 105 | line-ending = "lf" 106 | --------------------------------------------------------------------------------