I've designed a project around an Arduino Mini, that uses the additional ADC pins AD4-AD7. I'm having trouble reading from AD6 and AD7. I've verified that the connections are OK to the board (checked continuity with a multimeter) so it doesn't seem to be a hardware issue.
I've initialized AD6 and AD7 as inputs using pinMode (20 and 21, respectively) and the compiler seems cool with that.
The code also seems to do an analogRead just fine on the pins, but I can't get serial.println to spit out the value that was read - it crashes the arduino! So, I suppose I'm not really sure if analogRead really worked or not.
So is there anything special I need to be doing to get these ADC lines to work? Without serial.println working, how can I verify that the analogRead is happening (and get a specific value?)
Thanks for your help...