Here's my project. I am measuring the current flow to a motor. To do this I am measuring the voltage across a shunt resistor in series with that motor. The problem that I have is the voltage measured across that resistor is a max of 7mvolts, and that obviously cannot be measured with any kind of accuracy using the normal "analogread". I noticed the Mega has differential inputs and I was wondering if there were any libraries already made that I could use or if I would have to start from scratch? If I would have to start from scratch where would be a good place to start to get me headed in the right direction.
Thanks for any help!