Electronical novice (but Advanced Idiot) here. Trying to interface a phototransistor to a Microchip PIC I/O pin. Per the phototransistor's datasheet, I'm feeding +5V into the collector and have a resistor between the emitter and GND. When the emitter isn't connected to the PIC, a voltmeter on the emitter reads nicely between near-0V to +5V with varying light exposure. But when I tie the emitter to the PIC, that range drops to a maximum of less than +0.5V. Changing the resistor value or swapping the resistor to the collector side (emitter then is to GND) and measuring there doesn't seem to make a difference. Setting the pin up for ADC or not doesn't either. TRIS definitely has it set as input though. Looking online, seems like lots of circuits showing the hardware as I have it. Is it something about the PIC? I'm sure it's something dead simple. Suggestions? Rebukes?