Sample Code

//ADKeyboard Module

//Developed by DFRobot.com

//Last modified 30/11/2011

//Version 1.0

int adc_key_val[5] ={600,650, 700,

800, 900 };

int NUM_KEYS = 5;

int adc_key_in;

int key=-1;

int oldkey=-1;

void setup()

{

pinMode(13, OUTPUT);

//we'll use the debug LED to output a heartbeat

Serial.begin(9600); // 9600 bps

}

void loop()

{

adc_key_in = analogRead(0);

// read the value from the sensor

digitalWrite(13,LOW);

key = get_key(adc_key_in);

// convert into key press

if (key != oldkey)

// if keypress is detected

{

delay(50);

// wait for debounce time

adc_key_in = analogRead(0);

// read the value from the sensor

key = get_key(adc_key_in);

// convert into key press

if (key != oldkey)

{

oldkey = key;

if (key >=0){

digitalWrite(13,HIGH);

switch(key)

{