ramps thermocouple pins dual extruders

Having problem getting the dual extruders to work with thermocouples.

I hooked up aux1 the positive and negative and pin 3. I get temp readings.

I enabled dual extruders and I tried Aux pin 4 and pin 7 in pins.h section but no luck. I have the LCD screen taking up aux3. I dissconnected one of the thermocouples and oddly enough it displays 2 different readings.


So can i use the Aux2 for the second thermocouple and which pin?

Which thermocouple boards are you using?

RAMPS by default doesn't directly interface with thermocouples, so you need an interface board of some kind, and there is no set standard for them. Some use analog comms from the interface chip, and some use digital (and not all the digital ones use the same protocol).