This is based on the work from Adam Welch http://adamwelch.co.uk/2016/01/lithium-ion-18650-battery-capacity-checker/ with several changes
- Ability to discharge 4 cells instead of 1
- Arduino code re-factored to use a millis() timer rather than delay()
- LCD code removed to maximize available Arduino pins
- Logging is done over serial to a Raspberry Pi
- A script runs on the Raspberry Pi to send a tweet when all cells have been discharged
Features I'm looking to add:
- JSON output
- REST API
- Ability to replace individual cells that are complete
Feel free to submit a pull request.
Thanks.