Simple Light Sensor Alarm circuit with NE555


Posted on Feb 7, 2014

This circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 astable multivibrator was used here which sent signal a tone of about 1kHz upon detecting light. The sensor when exposed by light completes the circuit and makes the 555 oscillate at about 1kHz with transistor to drive current. Sensitivity can be adjust wit


Simple Light Sensor Alarm circuit with NE555
Click here to download the full size of the above Circuit.

h P1. This makes the sun light to flow through it to the ground and prevents the alarm from going on due to the stored light on the sensor.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Mini-box 2W Amplifier
    PC parallel port Null Printer Adapter
    Walkman amplifier II
    Negative-triggered-touch-circuit
    Time Delay Relay Circuit
    Drive Two-Six White LEDs (WLEDs) in Parallel
    25 Watt Audio Amplifier Circuit
    cheap motors with arduino
    ttl three state logic probe circuit
    Simple Metal Detector Circuit
    Crystal Tester Circuit
    Changes inductive boost LED Driver
    PPMC and stepping motor driver IC dedicated connection circuit
    Days to TN-1 Intelligent negative pulse charging circuit



    Top