Hi
LiPo batteries are generally 3.7-4,2V cells wired in series. I need to measure their voltages (in a 3 cell battery).
I'm building a flight controller based on Arduino and MPU6050 and it would be nice to monitor each cel's voltage.
I think I can use analog pins but the problem is as they are wired in series, the positive of some cells is the negative of another, and so!
Any hint?
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Super nice.
But unusual. Flight controllers I use give me total battery voltage, and deduce an average cell voltage.
Which is nice, because it means in my OSD I can put the average cell voltage, and always fly to the same voltage point, for me 3.4 under load.
Unless you have really bad batteries, you won't need to worry too much about the cells becoming unbalanced during a flight.
Check the battery free each flight, always y use a balance charger and as soon as one cell is more than a little compromised balance-wise, retire the battery.
Alternately, if you insist on in air balance monitoring and you have the capacity, fly a battery monitor with everything else. They can be set to alarm when any cell goes below a certain voltage, and make enough noise so that may be all you need.
https://www.getfpv.com/1-8s-lipo-battery-voltage-tester-low-voltage-buzzer-alarm.html
Just hook it on the balance connector and off you go.
a7
Using the first ‘bottom’ negative as ‘ground / 0V’, you can measure each of the positive nodes going up the chain
Simply add/ subtract for each battery to get the individual bells.
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