I'm trying to use a small leftover 5V solar panel as a darkness sensor, as in input into a PIC12F675 inbuilt comparator. But the difference in reading between the multimeter and when hooked up the PIC is extreme to the point it's not really usable. Like say 1.5V on the meter, but then only 10mV if that hooked up to the PIC. I know the virtual open circuit voltage is different from a solar panel vs loaded, but the difference is far more than I thought. As a test I also charged up a cap to 5V, then let it drain purely on that comparator input pin, and it drops quite quickly. I thought it was meant to be relatively high impedance input? Any workarounds or ideas?