differential analog read with gain (PGA) for arduino Mega2560, Leonardo
tested on atmega2560 board pins A0-A1
but have to work on
mega1280
atmega32u4 Leonardo, pro micro (if pins A4 A5 available)
probably it is good for fast reading bridge sensors: weight strain gauge / load cell , current, analog hall, custom Wheatstone Bridges, ...
make it as Arduino library
https://www.davidpilling.com/wiki/index.php/DiffADC there avail some explanation