Night security light


Posted on Feb 5, 2014

This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the pin 12 of IC1 becomes low and the IC starts oscillating, which indicated by the flashing of L


Night security light
Click here to download the full size of the above Circuit.

ED D3. The values of the timing components R1, R2, C4 are so selected that the out put pin3 of IC1 goes high after 8 hours. That means the high output drives the triac to switch on the lamp around 2`O clock. At morning, the LDR resistance drops and the pin 12 of IC1 goes high and stops the oscillation, making the lamp OFF. The switch S1 can be used to manually ON the lamp. The capacitor C2 prevents false triggering.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    RF-telemetry transmitter features minimal parts count
    Mains variable Delay circuit
    Auto poweroff for power supplies circuit
    ISP Programming Kit for AT89S52 and AVR series Microcontroller
    fredbox
    fm transmitter 88 108mhz ic
    2 km FM transmitter
    Photo relay circuit
    Parallel Path Magnet Motor



    Top