Strange behaviour from PIC16F877 on TMR0

[mikebar]

Hi JS.
Thank you for your suggestions. I will try to use these parts. Did you think that the HC version of the gates are good enough?
I mean 74HC02, 74HC04 etc.

All the best.
Mike.

[Archangel]

Yes I do, but I think the key is to use something with a schmitt trigger, too often logic without them tends to languish in a state 1/2 way between high and low, and then they will operate intermittantly as power suppliy voltage, temp. and humidity, or will of the gods dictate.

[Archangel]

Before you go out and buy anything, try a low power LED on you input and visually see what happens when you turn the motor by hand.
JS