TP223 is a capacitive touch sensor module that can detect the touch of a finger or a conductive object. It is a compact and low-cost module that can be easily integrated into various electronic projects.The module has a single touch pad, which can be connected to a microcontroller or a digital input of a circuit. When a user touches the touch pad, the module detects the change in capacitance and outputs a digital signal to indicate the touch.

The TP223 module has a wide operating voltage range of 2.0V to 5.5V, making it compatible with a variety of electronic devices. It also has a built-in power-on reset circuit, which ensures reliable operation during power-up.The TP223 module is commonly used in various applications such as touch switches, touch lamps, touch sensors, and other human-machine interfaces. It is easy to use, requires minimal external components, and has low power consumption, making it an excellent choice for battery-powered devices.

Overall, the TP223 capacitive touch sensor module is a versatile and reliable touch sensor module that can be used in a wide range of electronic projects.

TTP223 Capacitive Touch Sensor

Pin Configuration of TTP223 Touch Sensor

The touch sensor as you can see in the picture above consists of only three pins. These are the signal, VCC, and GND pins.

The OUT pin is connected with the digital pin of Arduino board. This will be set up as an input. When pressure will be applied at the sensor’s surface, the signal will be 1 or HIGH. Other wise it will be 0 or LOW.

The VCC pin is connected with the power pin of the Arduino. The touch sensor module supports 2.0-5.5V DC power supply. We will connect this pin with Arduino 5V pin.

The GND pin is connected with the GND of the Arduino board.

Pin diagram of TTP223 Capacitive Touch Sensor

Features of TTP223 Capacitive Touch Sensor

The response time max 220mS at low power mode @VDD=3V

Sensitivity can adjust by the capacitance(0~50pF) outside

Stable touching detection of the human body for replacing traditional direct switch key

Provides Low Power mode

Provides direct mode、toggle mode by pad option(TOG pin) Q pin is CMOS output

All output modes can be selected active high or active low by pad option(AHLB pin)

Operating voltage 2.0V~5.5V

Operating current @VDD=3V, no load

At low power mode typical 1.5uA, maximum 3.0uA

After power-on have about 0.5sec stable-time, during the time do not touch the keypad, And the function is disabled

Auto calibration for life.

At low power mode, the re-calibration period is about 4.0sec normally,

When key detected touch and released touch, the auto re-calibration will be redoing after about 16sec from releasing key

The sensitivity of TTP223N-BA6 is better than TTP223-BA6’s. But the stability of TTP223N-BA6 is worse than TTP223-BA6’s.

Modes / Configuration of TTP223 Touch Sensor

There are four different configurations for this touch switch, which is explained below in details.

Modes of TTP223 Capacitive Touch Sensor

Config 1:

To obtain configuration one both A and B terminals should be in open position.

Default output state will be LOW

Changes the state (to HIGH) when a touch is detected and will be back to the default state when touch is released

Config 2:

To obtain configuration one both A should be open and B should be closed position.

Default output state will be LOW

Changes the state when a touch is detected and remains on that state until another touch is detected.

Config 3:

To obtain configuration one both A should be closed and B should be in open position.

Default output state will be HIGH

Changes the state (to LOW) when a touch is detected and will be back to the default state when touch is released

Config 4:

To obtain configuration one both A and B terminals should be closed position.

Default output state will be HIGH

Changes the state when a touch is detected and remains on that state until another touch is detected.

Touch sensitivity Adjustment

The TP223 capacitive touch sensor module's sensitivity can be adjusted by adding a capacitor. The value of the capacitor can range from 0 to 50 pf, with 0 pf providing maximum sensitivity, and 50 pf providing the lowest sensitivity.

For example, if you want to use the touch switch through a glass or acrylic material, you may need to adjust the sensitivity based on the thickness of the material. Adding a capacitor with an appropriate value can increase or decrease the sensitivity of the touch sensor, allowing it to detect touches through the material.

In general, adjusting the sensitivity of the TP223 module can help optimize its performance for different applications and environments. By adding or removing capacitors, you can fine-tune the module's sensitivity to meet specific requirements and improve its reliability and accuracy.

For full Project :

https://electronicsworkshops.com/2023/03/24/interfacing-ttp223-capacitive-touch-sensor-with-arduino/