Hi everyone, I've got a  rather weird problem here. I  configured my
microcontroller to count incoming pulses using a function called event
couter mode. This is commonly used to track the position of a motor
movement. The pulse generating circuit and my microcontroller shares the
same DC power supply(wall wart). The pulses are sent to the microcontroller
input pin via a schmidt trigger.

The strange thing is that once I turn on a standard DC power supply
unit(using the same AC outlet), the counter goes haywire. The DC power
supply unit is not connected to anything except the incoming mains. I move
the power supply unit to another mains(which is isolated from the
microcontroller) and the problem is solved. Is there anything I can do to
prevent this?

Thanks
Mark





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