I have a small robot project and I want to monitor the LiPo I’m using. From experience elsewhere, I know the cells in a LiPo can discharge in a surprisingly uneven manner so I’d like to monitor the individual cells via the balance connector.
As this isn’t the core of the project I was hoping to find a ready to go solution, e.g. a breakout with a balance connector and a small IC with e.g. I2C output that I could interface with. But no such luck
The easiest thing to do would be to buy a low voltage alarm and desolder the buzzers and wire their connections into my MCU. I wouldn’t have per cell data but I’d know the alarm was monitoring the individual cells and activating the buzzer when the first of them went too low. E.g. this project on Instructables does exactly that.
The alternative with a bit more work would be to wire up something nice and tiny like an M0 trinket (although after taking 2 pins for I2C, to talk to the main MCU, I’d only have 3 analog capable pins left over - so maybe it’s a bit too tiny).
Usually one can find a fairly definitive looking project for this kind of thing, e.g. something in the learning sections of Pololu, Adafruit or Sparkfun. But I didn’t come across something that had that “this is definitely the answer” feel.
I did find this project (using a RaspIO Duino) and this one (involving a different resistor layout) using an Arduino Nano. The second one looks more convincing to my untrained eye (I’m a software person who hacks hardware in a somewhat cookbook style - generally after massively over investigating things).
Any other pointers or comments would be a great help Thanks