First time to post here I’m relatively a newbie with Arduino so please bear with me. Anyway, right now I’m working on a project that will allow Arudino to measure voltages of a 3 series battery pack connections. Basically there’ will be three (3) 18650 lithium-ion batteries connected in series.
Nominal voltage of each cell is 3.7 so in 3S (series) configuration, I should be able to get 11.1V or 12.6V when fully charged.
However, I’m not incline of getting the total voltage using a voltage divided but rather, I would want each series voltage to be read from an Analog inputs of Arduino (i.e. Voltage of Series 1 goes to A0, voltage of Series 2, goes to A1 and Voltage of Series 3 goes to A3) (Please see attachment for visual representation).
Now, here are my questions:
- How would I be able to connect each series in Arduino to measure their corresponding voltage since their ground reference is different from each series connection? If my initial plan is not viable, what other ways to achieve such requirement. Appreciate any suggestions you may have.
- By the way are the ground PINs (i.e. power ground, digital ground, etc.) isolated from each other?
Thanks in advance.