A capacitive touch switch module (TTP223) is a touch pad detector integrated circuit which works as a single tactile button, which means, it can be used to sense touch inputs as switch buttons and do the work accordingly. This touch detection IC is designed for replacing traditional direct button keys with diverse pad sizes. The touch plate of the sensor is present in the opposite face of the pins.
There are two bridges in the TTP223 module. It has 3 modes, depending upon which bridge is soldered.
Like many other modules, it also has 3 pins:-
1. GND – ground
2. I/O – input/output
3. VCC – power
| BRIDGE A | BRIDGE B | MODE |
| unsoldered | unsoldered | Touch to ON (initially low) |
| unsoldered | soldered | Touch to OFF (initially high) |
| soldered | soldered | Self-locking switch (initially low) |
| soldered | unsoldered | Self-locking switch (initially high) |
How to use
Tutorial –
https://diyusthad.com/2019/06/how-to-use-ttp223-based-touch-switch.html
Common Applications
1. Used as an alternative to touch pad switches.
Some example projects that students can try out in the ATL Lab
1. Make a circuit and control its ON/OFF states using capacitive touch switch module
Safety Measures to follow
● Do not put anything liquid with the interface of the module.
● Don’t apply excess pressure to the sensor part as it may get damaged.
Important Links
1. How to use a capacitive touch switch (https://www.youtube.com/watch?v=g_kqd64dXzA)
YouTube Video
