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Remote Operated Switch

To make a remote operated switch, you need to understand following circuits. I recommend you to make these circuits before you try a remote operated switch. a. Toggle switch using 555.

b. Dark sensor using two transistors.

c. How to use relay

d. Light operated switch

e. Monostable mode of operation of 555

f. How to use TSOP(infrared sensor)

Description of remote operated switch

When you press an infrared transmitter or normal TV remote control near TSOP1738 infrared sensor, the 555 timer configured in monostable mode gets triggered. The output pin 3 of 555 timer remains on for a while and the ‘on time’ is determined by the resistor R2 and capacitor C1. The output at pin3 along with transistor BD139 activates the 6Vrelay. The relay switches on the 555 timer configured in toggle switch mode and that finally glows LED D2. When you press remote control again near TSOP1738, the LED D2 switches off. Fig. Remote operated switch(Click on the schematic to enlarge it)

This project was tested and verified during LDR Engineering Course.

I am Sagar Sapkota living in Espoo, Finland. I have completed Master's degree in Electronics and Communications with major in Electronics Productization from the University of Turku, Finland. I love to share my electronics works with the world. You can buy my kits at buildcircuit.org. - Sagar Sapkota

8 COMMENTS

  1. Sir,
    instead of adding the toggle switch (using 2nd NE555 ) at the relays end can i directly apply it to load incase i don’t want to glow led ? -

  2. Sir,
    instead of adding the toggle switch (using 2nd NE555 ) at the relays end can i directly apply it to load incase i don’t want to glow led ?

  3. HI SIR
    I THINK THIS TSOP 1738 IC (INFRARED RECIVER) CAN TAKE FROM OUR SCRAP TV,DVD.
    ALSO

    CAN I MAKE MY OWN INFRARED TRANSMETER.(WITH REGULAR PUSH BUTOONS)

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