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This project controls a LED using the PWM on the beagle. I have hooked up a potentiometer to gpio7 and connected a switch to pin 60 this selects the duty cycle. When it is on, the duty cycle is 100% when it is off the duty cycle is 50%.
This also handles ^C by cleaning up the gpio pins and unexporting them.
It will also display the current voltage value from the analog input.