Automatic Night Lamp with Morning Alarm

May 15th, 2015
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This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning. A super-bright white LED is used as the night lamp. It gives bright and cool light in the room.

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Automatic Night Lamp with Morning AlarmC I I R U IU IIT EIAD E A SC RC C T D SAUTOMATIC NIGHT LAMP WITHMORNING ALARMD. MOHAN KUMARSANI THEOhis circuit automatically turns on anight lamp when bedroom light isswitched off. The lamp remainson until the light sensor senses daylightin the morning. A super-bright whiteLED is used as the night lamp. It givesbright and cool light in the room. Whenthe sensor detects the daylight in themorning, a melodious morning alarmsounds.sistors (LDRs) for sensing darkness andlight in the room. The resistance of LDR isvery high in darkness, which reduces tominimum when LDR is fully illuminated.LDR1 detects darkness, while LDR2 detects light in the morning. The circuit is designed around thepopular timer IC NE555 (IC2), which isconfigured as a monostable. IC2 is activated by a low pulse applied to its trigger pin 2. Onc

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