Touch activated LED valentine, circuit.
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Driving LEDs with a microcontroller
The LEDs are dimmed using a hardware pulse-width module (PWM) on the PIC (PORT C, pin 5). The PWM isn't strong enough to directly power all the LEDs, instead it switches the ground of the LEDs through a transistor. This is the same method used in the RGB color changer and the analog gauge projects.
Ian Lesnet
Feb 8th 2008 11:35AM
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