Lamp Timer


Posted on Feb 6, 2013

The purpose of this circuit is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. It is useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep... 30 minutes operation Blinking LED signals 6 last minutes before turn-off


Lamp Timer
Click here to download the full size of the above Circuit.

After turn-on by P1 pushbutton, the LED illuminates for around 25 minutes, but then it starts to blink for two minutes, stops blinking for two minutes and blinks for another two just before switching the lamp off, thus signaling that the on-time is ending




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