AT89C2051 Night Light Saver

Posted on Feb 4, 2014

The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated by Schmitt trigger gate CD4093, ~680kHz. Reference frequency was derived from 50Hz main lin

AT89C2051 Night Light Saver
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e. Time setting only allows at 18:00 by pressing time set button once. If main line has failed, functioning LED will blink at high rate. Since there is no battery backup, thus repressing the button is then needed. The output is capable of driving say, a 25W incandescent lamp.

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