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.