Hi folks -
Is there an Aref (analog voltage reference) pin somewhere on the Ultimate 2.0 MegaPi board? There is on the standard Mega 2560. My students are building robotic voltmeters, so we need a place to connect the stable voltage reference boards that we have built. In ArduinoC you use the analogReference() command to set this to be the external analog reference voltage pin.
Failing that, is there any other place on the board to get a stable voltage reference?