Hi, I'm just going mad. Wish somebody could help.
I'm making a tracked rover using a PIC16F877/20 and the classical SN754410.
I've got the H-Bridge connected to portd 0-6, separate 12 volts power for the motors, capacitors and so on.
I double checked everything about 30 times but only one of the two motors runs in both directions, (pin 2-3), the one connected to pin 0-1 only goes one way.
After all day measuring, checking, using multimeter etc, I just moved the control on portc and everything works smoothly.
I can't really understand why.
By the way, I tried with another SN754410 (just in case...), another 877 (just in case), I swapped motors.
I mean, everything was OK.
Any idea of where is my mistake? (I'd like to sleep tonight)
Tx.