Introduction

Battery-tester for up to 3 batteries (typically Li-* batteries). The circuite uses a INA3221 triple current sensor to measure batteries voltage and current drawn during a discharge cycle. Measrumentss are logged into the file system as CSV files which can then be imported in Excel in order to draw graph or perform additional calculations.

Note : I faced some memory problems with CircuitPlayground Express so I had to remove dependencies to adafruit_circuitplayground.express and use standard libs to acces neopixels and buttons. Code has also been splitted in 2:

• batterrytester.py implements the state machine for the test. On systems with limited memory (SAMD21), it must be precompiled to batterytester.mpy. Same applies to barbudor_ina3221 -> mpy
• runtest.py is the main script

Running : From REPL, execute

import batterytester import runtest runtest.test()

Dependencies

This script depends on:

• Adafruit CircuitPython <https://github.com/adafruit/circuitpython>
• Adafruit Bus Device <https://github.com/adafruit/AdafruitCircuitPythonBusDevice>
• Barbudor's CircuitPython_INA3221 driver <https://github.com/barbudor/CircuitPython_INA3221>

Contributing

This is a simple test I've done for my own usage which is not worth contribution. But feel free to fork, copy and adapt for your own usage.