├── .gitattributes ├── .gitignore ├── Hardware ├── SparkFun_ACS712LowCurrentSensorBoard.brd └── SparkFun_ACS712LowCurrentSensorBoard.sch ├── LICENSE.md ├── Production └── SparkFun_ACS712_Low_Current_Sensor_Panel_v14.brd ├── README.md └── Software └── SparkFun_ACS712_Demo └── SparkFun_ACS712_Demo.ino /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | 4 | # Custom for Visual Studio 5 | *.cs diff=csharp 6 | *.sln merge=union 7 | *.csproj merge=union 8 | *.vbproj merge=union 9 | *.fsproj merge=union 10 | *.dbproj merge=union 11 | 12 | # Standard to msysgit 13 | *.doc diff=astextplain 14 | *.DOC diff=astextplain 15 | *.docx diff=astextplain 16 | *.DOCX diff=astextplain 17 | *.dot diff=astextplain 18 | *.DOT diff=astextplain 19 | *.pdf diff=astextplain 20 | *.PDF diff=astextplain 21 | *.rtf diff=astextplain 22 | *.RTF diff=astextplain 23 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ################# 2 | ## SparkFun Useful stuff 3 | ################# 4 | 5 | ## AVR Development 6 | *.eep 7 | *.elf 8 | *.lst 9 | *.lss 10 | *.sym 11 | *.d 12 | *.o 13 | *.srec 14 | *.map 15 | 16 | ## Notepad++ backup files 17 | *.bak 18 | 19 | ## BOM files 20 | *bom* 21 | 22 | ################# 23 | ## Eclipse 24 | ################# 25 | 26 | *.pydevproject 27 | .project 28 | .metadata 29 | bin/ 30 | tmp/ 31 | *.tmp 32 | *.bak 33 | *.swp 34 | *~.nib 35 | local.properties 36 | .classpath 37 | .settings/ 38 | .loadpath 39 | 40 | # External tool builders 41 | .externalToolBuilders/ 42 | 43 | # Locally stored "Eclipse launch configurations" 44 | *.launch 45 | 46 | # CDT-specific 47 | .cproject 48 | 49 | # PDT-specific 50 | .buildpath 51 | 52 | 53 | ############# 54 | ## Eagle 55 | ############# 56 | 57 | # Ignore the board and schematic backup files 58 | *.b#? 59 | *.s#? 60 | 61 | 62 | ################# 63 | ## Visual Studio 64 | ################# 65 | 66 | ## Ignore Visual Studio temporary files, build results, and 67 | ## files generated by popular Visual Studio add-ons. 68 | 69 | # User-specific files 70 | *.suo 71 | *.user 72 | *.sln.docstates 73 | 74 | # Build results 75 | [Dd]ebug/ 76 | [Rr]elease/ 77 | *_i.c 78 | *_p.c 79 | *.ilk 80 | *.meta 81 | *.obj 82 | *.pch 83 | *.pdb 84 | *.pgc 85 | *.pgd 86 | *.rsp 87 | *.sbr 88 | *.tlb 89 | *.tli 90 | *.tlh 91 | *.tmp 92 | *.vspscc 93 | .builds 94 | *.dotCover 95 | 96 | ## TODO: If you have NuGet Package Restore enabled, uncomment this 97 | #packages/ 98 | 99 | # Visual C++ cache files 100 | ipch/ 101 | *.aps 102 | *.ncb 103 | *.opensdf 104 | *.sdf 105 | 106 | # Visual Studio profiler 107 | *.psess 108 | *.vsp 109 | 110 | # ReSharper is a .NET coding add-in 111 | _ReSharper* 112 | 113 | # Installshield output folder 114 | [Ee]xpress 115 | 116 | # DocProject is a documentation generator add-in 117 | DocProject/buildhelp/ 118 | DocProject/Help/*.HxT 119 | DocProject/Help/*.HxC 120 | DocProject/Help/*.hhc 121 | DocProject/Help/*.hhk 122 | DocProject/Help/*.hhp 123 | DocProject/Help/Html2 124 | DocProject/Help/html 125 | 126 | # Click-Once directory 127 | publish 128 | 129 | # Others 130 | [Bb]in 131 | [Oo]bj 132 | sql 133 | TestResults 134 | *.Cache 135 | ClientBin 136 | stylecop.* 137 | ~$* 138 | *.dbmdl 139 | Generated_Code #added for RIA/Silverlight projects 140 | 141 | # Backup & report files from converting an old project file to a newer 142 | # Visual Studio version. Backup files are not needed, because we have git ;-) 143 | _UpgradeReport_Files/ 144 | Backup*/ 145 | UpgradeLog*.XML 146 | 147 | 148 | ############ 149 | ## Windows 150 | ############ 151 | 152 | # Windows image file caches 153 | Thumbs.db 154 | 155 | # Folder config file 156 | Desktop.ini 157 | 158 | 159 | ############# 160 | ## Python 161 | ############# 162 | 163 | *.py[co] 164 | 165 | # Packages 166 | *.egg 167 | *.egg-info 168 | dist 169 | build 170 | eggs 171 | parts 172 | bin 173 | var 174 | sdist 175 | develop-eggs 176 | .installed.cfg 177 | 178 | # Installer logs 179 | pip-log.txt 180 | 181 | # Unit test / coverage reports 182 | .coverage 183 | .tox 184 | 185 | #Translations 186 | *.mo 187 | 188 | #Mr Developer 189 | .mr.developer.cfg 190 | 191 | # Mac crap 192 | .DS_Store 193 | -------------------------------------------------------------------------------- /Hardware/SparkFun_ACS712LowCurrentSensorBoard.brd: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | GND 124 | Vo 125 | 5V 126 | GAIN 127 | Vref 128 | IP+ 129 | IP- 130 | ACS712 Low Current 131 | Sensor Board v1 132 | v14 133 | IP- 134 | IP+ 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | >NAME 148 | >VALUE 149 | 150 | 151 | <b>CAPACITOR</b><p> 152 | chip 153 | 154 | 155 | 156 | 157 | 158 | 159 | 160 | 161 | >NAME 162 | >VALUE 163 | 164 | 165 | 166 | 167 | 168 | 169 | <b>CAPACITOR</b><p> 170 | chip 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | >NAME 181 | >VALUE 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191 | 192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 | >NAME 211 | >VALUE 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 | 221 | 222 | 223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | 232 | 233 | 234 | 235 | 236 | 237 | 238 | 239 | 240 | 241 | 242 | 243 | 244 | 245 | 246 | 247 | 248 | 249 | 250 | 251 | 252 | 253 | 254 | 255 | 256 | 257 | 258 | 259 | 260 | 261 | 262 | 263 | 264 | 265 | 266 | 267 | 268 | 269 | 270 | 271 | 272 | 273 | 274 | 275 | 276 | 277 | 278 | 279 | 280 | 281 | 282 | 283 | 284 | 285 | 286 | 287 | 288 | 289 | 290 | 291 | 292 | 293 | 294 | 295 | 296 | 297 | 298 | 299 | 300 | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 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>VALUE 787 | 788 | 789 | 790 | 791 | 792 | 793 | 794 | 795 | 796 | 797 | 798 | >NAME 799 | >VALUE 800 | 801 | 802 | 803 | 804 | 805 | 806 | 807 | 808 | 809 | 810 | 811 | 812 | 813 | 814 | <b>EAGLE Design Rules</b> 815 | <p> 816 | The default Design Rules have been set to cover 817 | a wide range of applications. Your particular design 818 | may have different requirements, so please make the 819 | necessary adjustments and save your customized 820 | design rules under a new name. 821 | 822 | 823 | 824 | 825 | 826 | 827 | 828 | 829 | 830 | 831 | 832 | 833 | 834 | 835 | 836 | 837 | 838 | 839 | 840 | 841 | 842 | 843 | 844 | 845 | 846 | 847 | 848 | 849 | 850 | 851 | 852 | 853 | 854 | 855 | 856 | 857 | 858 | 859 | 860 | 861 | 862 | 863 | 864 | 865 | 866 | 867 | 868 | 869 | 870 | 871 | 872 | 873 | 874 | 875 | 876 | 877 | 878 | 879 | 880 | 881 | 882 | 883 | 884 | 885 | 886 | 887 | 888 | 889 | 890 | 891 | 892 | 893 | 894 | 895 | 896 | 897 | 898 | 899 | 900 | 901 | 902 | 903 | 904 | 905 | 906 | 907 | 908 | 909 | 910 | 911 | 912 | 913 | 914 | 915 | 916 | 917 | 918 | 919 | 920 | 921 | 922 | 923 | 924 | 925 | 926 | 927 | 928 | 929 | 930 | 931 | 932 | 933 | 934 | 935 | 936 | 937 | 938 | 939 | 940 | 941 | 942 | 943 | 944 | 945 | 946 | 947 | 948 | 949 | 950 | 951 | 952 | 953 | 954 | 955 | 956 | 957 | 958 | 959 | 960 | 961 | 962 | 963 | 964 | 965 | 966 | 967 | 968 | 969 | 970 | 971 | 972 | 973 | 974 | 975 | 976 | 977 | 978 | 979 | 980 | 981 | 982 | 983 | 984 | 985 | 986 | 987 | 988 | 989 | 990 | 991 | 992 | 993 | 994 | 995 | 996 | 997 | 998 | 999 | 1000 | 1001 | 1002 | 1003 | 1004 | 1005 | 1006 | 1007 | 1008 | 1009 | 1010 | 1011 | 1012 | 1013 | 1014 | 1015 | 1016 | 1017 | 1018 | 1019 | 1020 | 1021 | 1022 | 1023 | 1024 | 1025 | 1026 | 1027 | 1028 | 1029 | 1030 | 1031 | 1032 | 1033 | 1034 | 1035 | 1036 | 1037 | 1038 | 1039 | 1040 | 1041 | 1042 | 1043 | 1044 | 1045 | 1046 | 1047 | 1048 | 1049 | 1050 | 1051 | 1052 | 1053 | 1054 | 1055 | 1056 | 1057 | 1058 | 1059 | 1060 | 1061 | 1062 | 1063 | 1064 | 1065 | 1066 | 1067 | 1068 | 1069 | 1070 | 1071 | 1072 | 1073 | 1074 | 1075 | 1076 | 1077 | 1078 | 1079 | 1080 | 1081 | 1082 | 1083 | 1084 | 1085 | 1086 | 1087 | 1088 | 1089 | 1090 | 1091 | 1092 | 1093 | 1094 | 1095 | 1096 | 1097 | 1098 | 1099 | 1100 | 1101 | 1102 | 1103 | 1104 | 1105 | 1106 | 1107 | 1108 | 1109 | 1110 | 1111 | 1112 | 1113 | 1114 | 1115 | 1116 | 1117 | 1118 | 1119 | 1120 | 1121 | 1122 | 1123 | 1124 | 1125 | 1126 | 1127 | 1128 | 1129 | 1130 | 1131 | 1132 | 1133 | 1134 | 1135 | 1136 | 1137 | 1138 | 1139 | 1140 | 1141 | 1142 | 1143 | 1144 | 1145 | 1146 | 1147 | 1148 | 1149 | 1150 | 1151 | 1152 | 1153 | 1154 | 1155 | 1156 | 1157 | 1158 | 1159 | 1160 | 1161 | 1162 | 1163 | 1164 | 1165 | 1166 | 1167 | 1168 | 1169 | 1170 | 1171 | 1172 | 1173 | 1174 | 1175 | 1176 | 1177 | 1178 | 1179 | 1180 | 1181 | 1182 | 1183 | 1184 | 1185 | 1186 | 1187 | 1188 | 1189 | 1190 | 1191 | 1192 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | SparkFun License Information 2 | ============================ 3 | 4 | SparkFun uses two different licenses for our files — one for hardware and one for code. 5 | 6 | Hardware 7 | --------- 8 | 9 | **SparkFun hardware is released under [Creative Commons Share-alike 4.0 International](http://creativecommons.org/licenses/by-sa/4.0/).** 10 | 11 | Note: This is a human-readable summary of (and not a substitute for) the [license](http://creativecommons.org/licenses/by-sa/4.0/legalcode). 12 | 13 | You are free to: 14 | 15 | Share — copy and redistribute the material in any medium or format 16 | Adapt — remix, transform, and build upon the material 17 | for any purpose, even commercially. 18 | The licensor cannot revoke these freedoms as long as you follow the license terms. 19 | Under the following terms: 20 | 21 | Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. 22 | ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original. 23 | No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits. 24 | Notices: 25 | 26 | You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation. 27 | No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material. 28 | 29 | 30 | Code 31 | -------- 32 | 33 | **SparkFun code, firmware, and software is released under the MIT License(http://opensource.org/licenses/MIT).** 34 | 35 | The MIT License (MIT) 36 | 37 | Copyright (c) 2016 SparkFun Electronics 38 | 39 | Permission is hereby granted, free of charge, to any person obtaining a copy 40 | of this software and associated documentation files (the "Software"), to deal 41 | in the Software without restriction, including without limitation the rights 42 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 43 | copies of the Software, and to permit persons to whom the Software is 44 | furnished to do so, subject to the following conditions: 45 | 46 | The above copyright notice and this permission notice shall be included in all 47 | copies or substantial portions of the Software. 48 | 49 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 50 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 51 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 52 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 53 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 54 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 55 | SOFTWARE. 56 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | **NOTE:** *This product has been retired from our catalog. There is an updated drop-in replacement with the ACS723 available: [SEN-14544](https://github.com/sparkfun/Current_Sensor_Breakout-ACS723-Low_Current). If you are looking for more up-to-date info, please check out some of these resources to see how other users are still hacking and improving on this product version.* 2 | 3 | * *[SparkFun Forum](https://forum.sparkfun.com/)* 4 | * *[Comments Here on GitHub](https://github.com/sparkfun/Low_Current_Sensor_Breakout-ACS712/issues)* 5 | * *[IRC Channel](https://www.sparkfun.com/news/263)* 6 | 7 | SparkFun Low Current Sensor Breakout Board - ACS712 8 | ====================================================== 9 | 10 | ![SparkFun Low Current Sensor Breakout Board - ACS712](https://cdn.sparkfun.com//assets/parts/2/1/5/6/08883-1.jpg) 11 | 12 | [*SparkFun Low Current Sensor Breakout Board - ACS712 (SEN-08883)*](https://www.sparkfun.com/products/8883) 13 | 14 | This current sensor gives precise current measurement for both AC and DC signals. 15 | These are good sensors for metering and measuring overall power consumption of systems. 16 | The ACS712 Low Current Sensor Breakout outputs an analog voltage that varies linearly with sensed current. 17 | 18 | Repository Contents 19 | ------------------- 20 | * **/Hardware** - All Eagle design files (.brd, .sch) 21 | 22 | Documentation 23 | -------------- 24 | * **[Hookup Guide](https://learn.sparkfun.com/tutorials/acs712-low-current-sensor-hookup-guide)** - Basic hookup guide for the ACS712. 25 | 26 | Product Versions 27 | ---------------- 28 | 29 | * [SEN-08883 (RETIRED)](https://www.sparkfun.com/products/8883)- Initial release; ACS712 Version of this Board 30 | 31 | License Information 32 | ------------------- 33 | 34 | This product is _**open source**_! 35 | 36 | Please review the LICENSE.md file for license information. 37 | 38 | If you have any questions or concerns on licensing, please contact techsupport@sparkfun.com. 39 | 40 | Distributed as-is; no warranty is given. 41 | 42 | - Your friends at SparkFun. 43 | 44 | __ 45 | -------------------------------------------------------------------------------- /Software/SparkFun_ACS712_Demo/SparkFun_ACS712_Demo.ino: -------------------------------------------------------------------------------- 1 | /* SparkFun ACS712 Demo 2 | Created by George Beckstein for SparkFun 3 | 4/30/2017 4 | 5 | Uses an Arduino to set up the ACS712 Current Sensor 6 | See the product page at: https://www.sparkfun.com/products/8883 7 | 8 | Parts you may need: 9 | - 100 Ohm, 1/2W or greater resistor OR two 220 Ohm 1/4 resistors in parallel 10 | - ACS712 Breakout with on-board amplifier 11 | 12 | Optional equipment: 13 | - Oscilloscope 14 | - Multimeter (or two) 15 | - A power supply with current limiting/constant current would be handy to calibrate the device without using resistors 16 | */ 17 | 18 | const int analogInPin = A0; 19 | 20 | // Number of samples to average the reading over 21 | // Change this to make the reading smoother... but beware of buffer overflows! 22 | const int avgSamples = 10; 23 | 24 | int sensorValue = 0; 25 | 26 | float sensitivity = 100.0 / 500.0; //100mA per 500mV = 0.2 27 | float Vref = 2500; // Output voltage with no current: ~ 2500mV or 2.5V 28 | 29 | void setup() { 30 | // initialize serial communications at 9600 bps: 31 | Serial.begin(9600); 32 | } 33 | 34 | void loop() { 35 | // read the analog in value: 36 | for (int i = 0; i < avgSamples; i++) 37 | { 38 | sensorValue += analogRead(analogInPin); 39 | 40 | // wait 2 milliseconds before the next loop 41 | // for the analog-to-digital converter to settle 42 | // after the last reading: 43 | delay(2); 44 | 45 | } 46 | 47 | sensorValue = sensorValue / avgSamples; 48 | 49 | // The on-board ADC is 10-bits -> 2^10 = 1024 -> 5V / 1024 ~= 4.88mV 50 | // The voltage is in millivolts 51 | float voltage = 4.88 * sensorValue; 52 | 53 | // This will calculate the actual current (in mA) 54 | // Using the Vref and sensitivity settings you configure 55 | float current = (voltage - Vref) * sensitivity; 56 | 57 | // This is the raw sensor value, not very useful without some calculations 58 | //Serial.print(sensorValue); 59 | 60 | /************************************************************************************* 61 | * Step 1.) 62 | * Uncomment and run the following code to set up the baseline voltage 63 | * (the voltage with 0 current flowing through the device). 64 | * Make sure no current is flowing through the IP+ and IP- terminals during this part! 65 | * 66 | * The output units are in millivolts. Use the Arduino IDE's Tools->Serial Plotter 67 | * To see a plot of the output. Adjust the Vref potentiometer to set the reference 68 | * voltage. This allows the sensor to output positive and negative currents! 69 | *************************************************************************************/ 70 | 71 | Serial.print(voltage); 72 | //Serial.print("mV"); 73 | 74 | /************************************************************************************* 75 | * Step 2.) 76 | * Keep running the same code as above to set up the sensitivity 77 | * (how many millivolts are output per Amp of current. 78 | * 79 | * This time, use a known load current (measure this with a multimeter) 80 | * to give a constant output voltage. Adjust the sensitivity by turning the 81 | * gain potentiometer. 82 | * 83 | * The sensitivity will be (Vreading - Vref)/(known current). 84 | *************************************************************************************/ 85 | 86 | /************************************************************************************* 87 | * Step 3.) 88 | * Comment out the code used for the last two parts and uncomment the following code. 89 | * When you have performed the calibration steps above, make sure to change the 90 | * global variables "sensitivity" and "Vref" to what you have set up. 91 | * 92 | * This next line of code will print out the calculated current from these parameters. 93 | * The output is in mA 94 | *************************************************************************************/ 95 | 96 | //Serial.print(current); 97 | //Serial.print("mA"); 98 | 99 | 100 | // -- DO NOT UNCOMMENT BELOW THIS LINE -- 101 | Serial.print("\n"); 102 | 103 | // Reset the sensor value for the next reading 104 | sensorValue = 0; 105 | } 106 | --------------------------------------------------------------------------------