Last night was a pain but I assembled the unit and got it calibrated... after the power went off a few times due to storms I gave up.
I have it working but I am getting 2.19v with the calibration rod in when connected to the PICA board. If I connect the multimeter alone (or remove the pin T3) I get the correct 1.55v which is close the calibration rod and when I stick filament in I got 1.73v which is close of filament I had... it seems to be about 0.05 out to be exact.
In Pin.h I added:
// #define TEMP_3_PIN 12
//added pin for Filament sensor analog input
#define FILWIDTH_PIN 12
Should I comment out the #define TEMP_3_PIN 12 line? seems to work with the line commented out anyway.
No matter how, I see it when I connect to pin 12 I get 2.19v with the rod and about 2.35 with filament. I can see the size vary s the filament pases through but the percentage change is just on 100% but I assume this is because it is out side the parameters as the firmware is looking for a Max of 2.0 and a Min of 1.5.