Tastatura capacitiva 4 butoane TTP224 Arduino / PIC / AVR / ARM / STM32 #009

This Capacitive Touch Module uses the touch-sensing IC TTP224 to add capacitive touch to your project . Just power with 2.4 to 5.5VDC and touch the pad to activate the sensor. These touch switches interface easily to any project - with or without a microcontroller.

When a capacitive load (such as a human hand) is in close proximity to the sense-pad, the sensor detects the change in capacitance and activates the switch. Custom sense-pads can be made from nearly any conductive material and these sensors can detect touch through thin layers of non-conductive materials such as glass, plastic, fabric or even wood. So, you can make this sensor hidden in the wall, tabletop and other places, which allows you to remove the conventional push-buttons troubles.

There are totally 4 pads on this module, these sense-pads can be extended with wire and almost any conductive material, so that you can add 4 touch switch easily for your project.

Specification:

• Onboard TTP224 capacitive touch sensor IC 4 keys
• 4 board-level status indicator
• Working voltage: 2.4V-5.5V
• Advanced Pins breakout, so that the output mode and working mode selectable.
• Low power selection
• PCB board size: 35 (mm) x29 (mm

In this example I connect a TTP224 4-CHANNEL CAPACITIVE TOUCH module that I bought recently to an Arduino. This capacitive module offers 4 touch pads, here is a picture of this

TTP224 4-CHANNEL CAPACITIVE TOUCH

 

Schematic

We connect the 4 outputs to Arduino pins 4 to 7, this is a basic schematic

arduino and ttp224

Code

Copy the following into your Arduino IDE and uplaod the sketch, now open the serial monitor and press one of the number buttons. The serial monitor displays the button pressed.

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int i;   void setup() { //set pins 4 - 7 as inputs for(i=4; i<=7; i++) { pinMode(i, INPUT); } Serial.begin(9600); }   void loop() { for(i=4; i<=7; i++) { if(digitalRead(i) == HIGH) { //I'm using pins 4 - 7 so subtract 3 to match //numbering on module Serial.println(i-3); } } delay(100); }