Published March 31, 2020 © GPL3+

Touch Activated Relay – How to

Let’s learn how to use a touch switch with a single relay or relay channel to control the relays. So that we can drive high voltage appliance

BeginnerFull instructions provided723

Things used in this project

Hardware components

Seeed Studio Grove - 2-Channel SPDT Relay

ttp223 touch switch

Story

Let’s learn how to use a touch switch with a single relay or relay channel to control the relays. So that we can drive high voltage appliances using touch switches.

Video

Pinout

TTP223 Configurations

There are total 4 different configurations for the ttp223 touch switch for our current application we are going to use the 2nd configuration which is A is open & B is closed. By default, the ttp223 switch will be coming in configuration 1 which is both A and B are open.

Circuit

Connect the GND of the ttp223 touch switch with the GND of the relay board.
Connect the OUT of the ttp223 touch switch to the IN of the relay board.
Connect the VCC of the ttp223 touch switch to the VCC of the relay board.
Connect the negative of the 5v power supply to the common GND of the circuit.
And finally, connect the +5v to the common VCC of the circuit as shown above in the circuit diagram.
Now you can connect any AC appliance to the relay as shown.