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TTP224 Touch Sensor ​

  This module is a capacitive touch switch module based on the touch detection IC (TTP223B). In its normal state, the module outputs a low level and operates in low-power mode. When the corresponding position is touched with a finger, the module will output a high level and switch to a fast mode. If no touch is detected for 12 seconds, the module will switch back to low-power mode. The module can be installed on non-metallic materials such as plastic or glass surfaces. It is also possible to cover the surface of the module with a thin sheet of paper (non-metallic) until the touch position is correct, allowing it to be used as a hidden button in places like walls or tabletops. This module helps you avoid the hassle of conventional pressure-type buttons.

Module Source ​

Specifications ​

Operating Voltage: 2.4V to 5.5V

Operating Current: 2.5uA to 9uA

Module Size: 35mm x 29mm

Fastest Response Time: 100ms

Control Method: GOIO (General Input/Output)

Pin Count: 6 pins (2.54mm pitch header)

Hardware Connection ​

  Generally, the TTP224 module has four touch keys, with each key corresponding to an output pin. Additionally, there are two power supply pins, VCC and GND.

  • Connect the VCC of TTP224 to the 5V of the development board.
  • Connect the GND of TTP224 to the GND of the development board.
  • Connect the output pins of TTP224 (usually labeled OUT1, OUT2, OUT3, OUT4) to the digital input pins 2, 3, 4, and 5 of the development board.

Usage Method ​

c
/******************************************************************************
  * Test Hardware: LCSC ColorEasyDuino Development Board
  * Version Number: V1.0
  * Modified By: www.lckfb.com
  * Modification Date: April 8, 2024
  * Function Overview:
  *****************************************************************************
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******************************************************************************/
// 定义连接到TTP224触摸传感器输出的Arduino引脚
const int touchPin1 = 2;    //OUT1
const int touchPin2 = 3;//OUT2
const int touchPin3 = 4;//OUT3
const int touchPin4 = 5;//OUT4

void setup() {
  // 初始化串行通信
  Serial.begin(9600);

  // 将触摸传感器连接的引脚配置为输入
  pinMode(touchPin1, INPUT);
  pinMode(touchPin2, INPUT);
  pinMode(touchPin3, INPUT);
  pinMode(touchPin4, INPUT);
}

void loop() {
  // 读取各个触摸键的状态
  int state1 = digitalRead(touchPin1);
  int state2 = digitalRead(touchPin2);
  int state3 = digitalRead(touchPin3);
  int state4 = digitalRead(touchPin4);

  // 如果任一触摸键被按下，打印其状态
  if (state1 == HIGH || state2 == HIGH || state3 == HIGH || state4 == HIGH) {
    Serial.print("Touch states: ");
    Serial.print(state1);
    Serial.print(" ");
    Serial.print(state2);
    Serial.print(" ");
    Serial.print(state3);
    Serial.print(" ");
    Serial.println(state4);
  }

  delay(100);  // 稍作延迟，避免过于频繁的读取
}

Usage Testing ​

Touch each of the 4 areas separately, and the touched area is displayed as 1 in the serial port debugging tool.

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