#1 LiPo ESR
Posted: Thu May 20, 2021 10:02 am
and now for something completely different.....
The scenario
I was going to rig up a device to measure the internal resistance of a lipo battery(max 4 cells 18v), using an atmel 8 bit which requires a divider to take the voltage down to the max adc level.
I was going to use the circuit shown in order to use the function:
Ri = (Vopen-Vload)/I
The question: does the panel think that the divider will affect the on load vs off load voltage for the calcs.
If anybody is curious why the atmel and not just use dmm then the thinking is that I can lend out the device and the whole thing relies on timing between the readings...and obviously a disconnect after the prescribed time.
The scenario
I was going to rig up a device to measure the internal resistance of a lipo battery(max 4 cells 18v), using an atmel 8 bit which requires a divider to take the voltage down to the max adc level.
I was going to use the circuit shown in order to use the function:
Ri = (Vopen-Vload)/I
The question: does the panel think that the divider will affect the on load vs off load voltage for the calcs.
If anybody is curious why the atmel and not just use dmm then the thinking is that I can lend out the device and the whole thing relies on timing between the readings...and obviously a disconnect after the prescribed time.