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>
>Not sure of your circuit but this will/should work.
>NPN transistor.
>Two input probes A and B
>Input A via 100K resistor to transistor base

Try 1k here, not much base current happening!


>Input B to PIC Vcc (perhaps via eg 10K resistor for safety)


Try 1k here as well, same as above


>Transistor emitter to ground
>100K resistor from transistor base to ground.
>10k resistor (or 100k) from transistor collector to Vcc (+5v)

10k, or even 4.7k




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