|
Yup, I was about to write that. 10 bits = 0-1023 output = about 0.1V resolution @ 100V, which is fine for me. If I had a lithium pack I would use multiple boards to get the resolution higher. 25+ separate measurements would require that anyway.
So bank2 reading - bank 1reading = bank 2 voltage, and so on.
Also, the Vref pin is only ever used if you want to read an analog signal of less than 0-5V using all 10 bits of ADC. For example, if you wanted to measure a 0-2V signal with 1023 steps of measurement, you would feed a 2V signal to Vref and write the code accordingly.
Normally, the ADC compares each analog input to +5, but the measured voltage potential needs GND to make the circuit. So I will hook GND up to the lowest pack potential as the zero ref.
Schematics to come.
|