Touchless Toggle Switch Help

Thread Starter


Joined Feb 5, 2022
Need help simplifying this project as arduino is abit overkill for this application. I am abit noob at electronics and wondering if there are any IC's or modules that will simplify or make this project more efficient. Thanks.

IR-1 and IR-2 are IR obstacle avoidance sensor modules.
Relay-1 and Relay-2 interconnect to form a latching relay.

If finger swipes past IR-1 THEN IR-2, Turn ON relay (keep in NO position)
If finger swipes past IR-2 THEN IR-1, TURN OFF relay (return to NC position)
Pretty much same as a normal light switch.


Joined Aug 23, 2012
What I thought as this way --

If the output of IR is Low to High then using CD4013:

IR → CR Differential circuit with 1N4148 → 5V logic level N MOSFET or you want to add a relay, you also could choose the P MOSFET and choose the different output of CD4013(D, CK all connected to Ground).

If the output of IR is High to Low then choose 74HC74.

You can choose C=0.1uF, R=47K to try and according to the time that the finger passes through IR-1 to IR-2, and adjust the values of CR.

There is a little strange in the circuit diagram of relays, are you drawn the wrong connection or what?


Joined Dec 31, 2017
Need help simplifying this project as arduino is abit overkill for this application
I don't think it's overkill by any means which Arduino model are you using? I'm thinking use a Nano.
Do not need two relays to latch if using a micro.
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