The TTP223 Touch sensor has the capability to make the entire touch sensor project without the need for complex circuits or mechanical buttons. The entire sensor board is a very tiny and compact one for DIY Projects.
In this article, I am sharing the Circuit diagram, a working explanation of the TTP223 Touch sensor based on/off the project. Simple and very minimal components are used in it. You can connect this circuit with a 12V relay to operate the home appliances too.
Introduction
The TTP223 Capacitive Touch sensor module is used in various electronics projects. Most hobby electronic enthusiasts and beginners choose this type of electronic sensor to build projects.
The capacitive touch sensor senses the touch or proximity without any physical contact. The compact design of this TTP223 Mosule makes it easy for electronics project building.
Key Features and Specifications
- Operating voltage: 2.0V to 5.5V DC
- Technology used: Capacitive sensing technology
- Touch Detection mode: Toggle mode and momentary mode
- Output interface: The output signal will be in digital format.
- Low power consumption and energy efficiency.
TTP223 Touch ON/OFF Circuit
Working
The circuit consists of two touch sensors. One is for turning on and the other one is for turning off the circuit. While the finger touch on the sensitive area produces a positive voltage in the output pin. That will pass through the 1N4007 diode and it reaches the BC547 transistor base pin.
At the same time, the Transistor turns on and starts to conduct negative voltage through it. Also the same time BD911 transistor turns on and the output voltage passes through it. If you are touching the second touch sensor the voltage passes to the nearest BC547 transistor and it will turn off the first BC547 and BD911 transistors. Then it will stop conducting the output voltage.
Components Required
| Component | Quantity |
| TTP223 Capacitive Touch sensor | 1 |
| L7805 or LM7805 Voltage regulator | 1 |
| BD911 Transistor | 1 |
| LED | 1 |
| BC457 Transistor | 2 |
| BC557 Transistor | 1 |
| 10K resistor | 5 |
| 1N4007 diode | 1 |
| 12v Battery | 1 |
Touch sensor Pinout
Conclusion
The TTP223 touch switch circuit is most suitable for home appliances and also for hobby electronics projects. It can able to handle high-power rating machines using a powerful relay attached to the circuit.
FAQ
The TTP223 Touch sensor module works based on capacitive technology. When one touch is detected the module produces the output voltage through the I/O Pin of the module.
The module works based on the touch sensing on the touchpad. The internal circuit starts to produce voltage while touching it.
0 to 50pf
It replaces the button key with a Touch switch.
