Example Code for Arduino-TouchPad

Hardware Preparation

• 3.3V Arduino Pro Mini: Quantity 1
• DFRobot Touch Kit (TouchPad): Quantity 1
• Wiring: SDA (MPR121) -> PIN A4 (Arduino), SCL (MPR121) -> PIN A5 (Arduino), IRQ (MPR121) -> PIN A2 (Arduino)

Software Preparation

• Development Tool: Arduino IDE
• Library: MPR121 v1.0.zip

Wiring Diagram

Touch pad CD

The pin number is the same to the PCB board one.

Other Preparation Work

Please download the MPR121 v1.0.zip first.

Sample Code

// #
// # Editor    : Jiang from DFRobot
// # Data      : 19.11.2012
// # E-Mail    : [email protected]

// # Product name  : Capacitive touch pad
// # Version  : 0.4
// # Power supply: 3.3v
// # Connection:
// #       SDA (MPR121) -> PIN A4 (Arduino)
// #       SCL (MPR121) -> PIN A5 (Arduino)
// #       IRQ (MPR121) -> PIN A2 (Arduino)

#include <Wire.h>
#include <mpr121.h>

int X ;           // X-coordinate
int Y ;           // Y-coordinate

// =========  setup  =========
void setup()
{
  //  initialize function
  Serial.begin(19200);
  Wire.begin();
  CapaTouch.begin();

  delay(500);
  Serial.println("START");
}


// =========  loop  =========
void loop()
{
  X=CapaTouch.getX();              // Get X position.
  Y=CapaTouch.getY();              // Get Y position.
  if(X>=1&&X<=9&&Y>=1&&Y<=13)
   {                                 // Determine whether in the range.If not,do nothing.
      Serial.print("X=");
      Serial.print(X);
      Serial.print("  Y=");
      Serial.println(Y);
   }
  delay(200);
}