LED (IR LED1) and the phototransistor (T1) and wireless light switch

Posted on Feb 6, 2014

The wireless light switch circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the phototransistor (T1). The infrared rays transmitted by IR LED1 is detected by the phototransistor to activate the hidden lock, flush system, hand dryer or else. This w

LED (IR LED1) and the phototransistor (T1) and wireless light switch
Click here to download the full size of the above Circuit.

ireless light switch is very stable and sensitive compared to other AC appliance control circuits. It is simple, compact and cheap. Current consumption is low in milliamperes. The circuit is built around an IC CA3140, IRLED1, phototransistor and other discrete components. The working of the circuit is simple. In order to switch on the appliance, you simply interrupt the infrared rays falling on the phototransistor through your hand. During the interruption, the appliance remains on through the relay. When you remove your hand from the infrared beam, the appliance turns off through the relay.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Positive input-negative output charge pump
    TT6061A and TT8486A sensitive touch light dimmer circuit with explanation
    5W Audio Amplifier Circuit based BD139/BD140
    Responsive Wearable Technology
    printed circuit board pcb etching
    DA-101 FM radio circuit chip
    Gas stove flame alarm circuit
    LM7805 + 5V power supply configuration