Circuit DIY – How to Make a Digital Light Dimmer!

http://www.elektronika.ba/img-cont/c/c_738_dim5.jpg

For those of you who want to control dimming of your house lights “digitally” using a single seven-segment display to show its brightness, you might want to take a look at these free circuit schematics on making a digital light dimmer.  It’s not in English but the code could still be very helpful. (Blog post in English)

The light level can be adjusted with two push-buttons “Up” and “Down”. Controller in this application is PIC16F84 that drives BUZ11 mosfet. Dimmer is tested with a light bulb 12V/4W and mosftet didn’t get even warm (which was expected since the datasheet says: 50V/30A). There is a small 5V voltage regulator on board LM78M05 (0,5 A) for the PIC microcontroller. Light level can be adjusted to 10 steps (0-9) and upon startup it is automatically adjusted to level 5. Current light level is displayed on 7-segment LED display with common anode. PCB was designed in Proteus and firmware is written in PBP.

via hackedgadgets

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