If you look at my other threads you can see I am working on a slot car timer. basically I trip an IR beam through a photo transistor and this allows positive voltage to pass to the pin which I programed to turn on a led when the pin is high. This worked great on the bench but when I installed it in the track the led light flickers on when ever you rev up the car. I am not one to go racing to this forum at the first sign of trouble so I have been working on this for a week now and can not figure it out I have removed the IR circuit from the equation as well as plugged the track and pic into separate wall hydro lines. There is no connection between the track and the PIC ( I now trigger the led with a switch when it is off the light will flicker from the car). It only does it with high pitched whining cars (the really fast ones). This might be EMI or a grounding problem. Could programming be the problem? Is this common with small 20 volt dc motors?
Any help is much apreciated.
Thank you
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