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这是一款神奇的触摸键盘shield。你可以使用它来使得你的arduino工程有个既酷又方便的输入方式。此款shield 采用MPR121芯片构建。触摸键盘上共有9个电容式触摸按键。并且预留了3个可以分配的接口，可以扩充为其它输入。

板子上带有电平转换电路，适用于5V和3.3V系统。shield预焊有长脚排母，可以很方便的直接插在你的arduino控制板上。

示例代码：

#include "mpr121.h"
#include "i2c.h"

// 11 max digits used
#define DIGITS 11

// Match key inputs with electrode numbers
#define ONE 8
#define TWO 5
#define THREE 2
#define FOUR 7
#define FIVE 4
#define SIX 1
#define SEVEN 6
#define EIGHT 3
#define NINE 0

//extras (not used)
#define ELE9 9
#define ELE10 10
#define ELE11 11

//interupt pin
int irqpin = 2; // D2

void setup()
{
//make sure the interrupt pin is an input and pulled high
pinMode(irqpin, INPUT);
digitalWrite(irqpin, HIGH);

//configure serial out
Serial.begin(9600);

//output on ADC4 (PC4, SDA)
DDRC |= 0b00010011;
// Pull-ups on I2C Bus
PORTC = 0b00110000;
// initalize I2C bus. Wiring lib not used.
i2cInit();

delay(100);
// initialize mpr121
mpr121QuickConfig();

// Create and interrupt to trigger when a button
// is hit, the IRQ pin goes low, and the function getNumber is run.
attachInterrupt(0,getNumber,LOW);

// prints 'Ready...' when you can start hitting numbers
Serial.println("Ready...");
}

void loop()
{
//You can put additional code here. The interrupt will run in the backgound.
}

void getNumber()
{
int i = 0;
int touchNumber = 0;
uint16_t touchstatus;
char digits[DIGITS];

touchstatus = mpr121Read(0x01) << 8;
touchstatus |= mpr121Read(0x00);

for (int j=0; j<12; j++) // Check how many electrodes were pressed
{
    if ((touchstatus & (1<<j)))
      touchNumber++;
}

if (touchNumber == 1)
{
    if (touchstatus & (1<<SEVEN))
      digits[i] = '7';
    else if (touchstatus & (1<<FOUR))
      digits[i] = '4';
    else if (touchstatus & (1<<ONE))
      digits[i] = '1';
    else if (touchstatus & (1<<EIGHT))
      digits[i] = '8';
    else if (touchstatus & (1<<FIVE))
      digits[i] = '5';
    else if (touchstatus & (1<<TWO))
      digits[i] = '2';
    else if (touchstatus & (1<<NINE))
      digits[i] = '9';
    else if (touchstatus & (1<<SIX))
      digits[i] = '6';
    else if (touchstatus & (1<<THREE))
      digits[i] = '3';

    Serial.print(digits[i]);
    i++;
}
//do nothing if more than one button is pressed
else if (touchNumber == 0)
    ;
else
    ;
}