Electrical noise problem with PIC 16f84

[Snap]

I can't modify the cars so I tried to make a faraday cage with a king sized beer can. First I had to empty the can and several others in case I wrecked the first one cutting the top off.
I put the bread board in the can and covered the other end with foil. I poked a small hole so i could see if the light flickered and to let the power and ir detect wires in and set it up.
It seemed to make no difference what so ever.
I was about to try grounding the can to a wire attached to the ground on the outlet and desided to try the other idea of a cap on the ir pin. This greatly reduced the flicker.
I used a 10 uf electrolite cap.
The project works well enough to move in and start programming reset buttond and relays to start and stop the cars.
Thanks for the posts

[sayzer]

What about the cap accross the motor terminals?

Didn't you put one?


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[Snap]

Thanks for the advice but these are vintage collector HO scale slot cars and I own about a hundred of them. I can't modify them.
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[Snap]

I tried everything I could think of, coffee can, caps on inputs and even caps on the rails them selves each one hellped a little bit more but not 100%. Finally I found another person who had the same problem. he suggested all the things I tried as well as explaining that the spikes were way faster then the cars. I programmed in a 7 us delay after the first signal is recieved and then wait and see if it is still there after and it worked. I could even take the board out of the coffee can. I am learning a schematic cad program and will post everything when I am done. Thanks to everyone who helped I am adding a relay start and programmed sound so Im sure I will be back .
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[mackrackit]

Nice solution!

[mvs_sarma]

I can't modify the cars so I tried to make a faraday cage with a king sized beer can. First I had to empty the can and several others in case I wrecked the first one cutting the top off.
I put the bread board in the can and covered the other end with foil. I poked a small hole so i could see if the light flickered and to let the power and ir detect wires in and set it up.
It seemed to make no difference what so ever.
I was about to try grounding the can to a wire attached to the ground on the outlet and desided to try the other idea of a cap on the ir pin. This greatly reduced the flicker.
I used a 10 uf electrolite cap.
The project works well enough to move in and start programming reset buttond and relays to start and stop the cars.
Thanks for the posts

Congrats-- But it is not proper to think like hating something, the moment it is teasing you. the challenge is only the to study, implement and overcome hurdles.

Arts like carpentry etc are equally problematic to people like me - should have aptience and gain experience from failures

All the best