Unused pins

[mackrackit]

At the risk of starting another argument/discussion...

An argument is a statement (premise) or group of statements (premises) offered in support of another statement (conclusion).

I was not thinking about the pin changing to an output. A resistor is good insurance.

[skimask]

An argument is a statement (premise) or group of statements (premises) offered in support of another statement (conclusion).

Good point...let me rephrase myself...

At the risk of sounding like a complete idiot..............................

[peterdeco1]

Thank you for the suggestion John. At the time of the problem I tried EVERYTHING - caps, grounding the motor casing, separate battery supplies for PIC circuit and motor, etc. Seemed the the PIC was just too close to the motor itself (I had no control over this). But by repeating the commands constantly (especially the TRIS commands to keep inputs as inputs and outs as outs) and the HIGHs as HIGHs, etc., the problem vanished. I also had another motor problem where the HPWM was set to a specific duty cycle and intermittently become an output HIGH or output LOW. Again, after setting the HPWM, I constantly repeated the command in other parts where the program would go and that fixed it. Of course the program took more memory, but that wasn't an issue.

[mister_e]

Who's John?

[JohnH]

Who's John?

That was me..

I sent peterdeco1 a private message regarding motor noise effecting A/D. My problem was solved by using .1uf caps from each motor lead to the motor's metal case. It seems to work with the small (noisy) hobby motors. I used shielded cable to the A/D inputs.


--John

[mister_e]

Welcome on the forum, and thanks to share your tips on the public area

[JohnH]

Welcome on the forum, and thanks to share your tips on the public area

Thanks Steve! I have learned a lot about Pic's from some of your posts and others here.

--John