Using WPU and ADC

[peterdeco1]

What phototransistor are you using? Generally, the collector needs a far lower resistance than the WPU's in the PIC. Maybe disable WPU's (if they enable in analog mode) and tie a suitable external resistor to B+. Or try a photoresistor instead. Good luck.

[Szczepaniec]

I am using an OSRAM, SFH 300 FA-3/4 which works fine. It is apparently a problem with my code because it doesn't work on my breadboard but a more basic program utilizing the WPU, ADC, and an LCD works fine. FWIW, I am using a 12F615 and you do have to activate the WPU after configuring the pin as an analog input.