I am putting together a device to measure a voltage from a 12V charging unit and batter. The idea is to take this measurement and transmit it to a “base station” for logging. For the initial trial I am using a Teensy. They are 5V tolerant but will cap the reading once the analogue input goes above 3.3V.
It was suggested that I could increase the resolution of the reading but taking a smaller sample. i.e. since the system I am building is not really interested in the full range i.e. 0-12V but more like 8V-14V, it should be possible to test for this using a voltage divider.
I have modeled this in Fastad and seems like I might have what was meant. I thought I would throw it to the forum for confirmation that this is the correct approach. In the end, this does not have to be super accurate. But do not want the analog signal to go above the 3.3V