Published March 22, 2018 © GPL3+

Get Started with Capacitive Touch Kit

In between a new project I decided to make a small tutorial on capacitive touch pad for your next project.

BeginnerProtip1 hour8,715

Things used in this project

Hardware components

DFRobot Capacitive Touch Kit For Arduino

Arduino UNO

Story

For my next project I'm going to use some capacitive touchpad, and before releasing it, I decided to make a small tutorial about the kit that I received for DFRobot.

The kit brings 3 touchpads:

Numeric keypad

Wheel pad

Touch pad

Connector board and rainbow cable. The kit only allow the use of one pad at a time connected to the Arduino. To start you will need the touch kit library, available here. Download and install it on your Arduino Library folder.

Schematic

Keypad Schematic

Wheel Schematic

Touchpad Schematic

Just follow one of the schematic, to connect them in your arduino board.

The communication is done trough I2C (A4 and A5 for arduino UNO) and an adicional pin D2 (I did not confirm this but I think that this library need an interruption pin, so I do not know about compatibility with other boards)

Code

Just do to the example folder of your Arduino IDE locate the MPR121 folder and load the example code according to the keypad that you have connected.

Or upload the ones in the attachment files.

Test it.

Example Folder

Conclusion

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Code

/*
 TouchWheel.pde
 MPR121 WhellPad Example Code
 
 by:Waiman Zhao
 Mail:Binpower@foxmail.com
 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);
}

/*
 Keypad.pde
 MPR121 Keypad Example Code
 
 by:Waiman Zhao
 Mail:Binpower@foxmail.com
 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==11)
  { Serial.print("key:");
  Serial.println("*");
  }
  else if(key==12)
  {
    Serial.print("key:");
  Serial.println("#");
  }
  else if(key>=0){
    Serial.print("key:"); 
    Serial.println(key); 
  }
	delay(200);
}

// #
// # Editor    : Jiang from DFRobot
// # Data      : 19.11.2012
// # E-Mail    : jianghao0716@gmail.com

// # 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 D2 (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);
}

Credits

Hugo Gomes

10 projects • 116 followers

http://www.hugogomes.net Youtube Channel - https://goo.gl/fnQLJo

Get Started with Capacitive Touch Kit

Things used in this project

Hardware components

Story

Schematic

Code

Conclusion

Schematics

Keypad

Wheel Pad

Touchpad

Code

TouchWheel.pde

Keypad.pde

Capacitive touch pad

Credits

Hugo Gomes

Comments

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Get Started with Capacitive Touch Kit

Get Started with Capacitive Touch Kit

Things used in this project

Hardware components

Story

Schematic

Code

Conclusion

Schematics

Keypad

Wheel Pad

Touchpad

Code

TouchWheel.pde

Keypad.pde

Capacitive touch pad

Credits

Hugo Gomes

Comments

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