I have a module with an ADC with a maximum input voltage of 2V. I would like to monitor the battery voltage of 15V with this input. I have successfully used a trimpot as a voltage divider to effectively divide by 10 to get 1.5V at the input.
The trimpot is to calibrate the reading because fixed resistors will never be exact. Is there something I can add to this in order to protect the ADC input against overvoltage if the trimpot is turned too far?
As an aside, I am planning to also add an op-amp voltage follower at the input to isolate the voltage divider from the ADC input.