Example Code for Arduino-WheelPad with MPR121 Capacitive Touch Kit (DFR0129)

This article offers detailed instructions on setting up and programming the Arduino-WheelPad using a 3.3V Arduino Pro Mini and the MPR121 library, featuring hardware and software preparation, wiring diagrams, and sample code to help users explore touch sensor technology.

Hardware Preparation

3.3V Arduino Pro Mini: Quantity 1
DFRobot Touch Kit (WheelPad): Quantity 1
Wiring: SDA -> A4, SCL -> A5, IRQ -> D2

Software Preparation

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

Wiring Diagram

Wheel 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


/*
 TouchWheel.pde
 MPR121 WhellPad Example Code

 by:Waiman Zhao
 Mail:[email protected]
 created on: 11/2/14
 license: CC-SA 3.0

 Hardware: 3.3V Arduino Pro Mini
           SDA -> A4
           SCL -> A5
           IRQ -> D2
*/


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

int key = 0;


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

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


// =========  loop  =========
void loop()
{
   key=CapaTouch.keyPad();

  if (key==1)
  { Serial.print("wheel:");
  Serial.println("0");
  }
   if (key==4)
  { Serial.print("wheel:");
  Serial.println("1");
  }
   if (key==7)
  { Serial.print("wheel:");
  Serial.println("2");
  }
   if (key==11)
  { Serial.print("wheel:");
  Serial.println("3");
  }
   if (key==2)
  { Serial.print("wheel:");
  Serial.println("4");
  }
   if (key==5)
  { Serial.print("wheel:");
  Serial.println("5");
  }

   if (key==8)
  { Serial.print("wheel:");
  Serial.println("6");
  }
   if (key==0)
  { Serial.print("wheel:");
  Serial.println("7");
  }
   if (key==3)
  { Serial.print("wheel:");
  Serial.println("8");
  }
    delay(200);
}