//ADKeyboard Module
//Developed by DFRobot.com
//Last modified 30/11/2011
//Version 1.0
int adc_key_val[5] = {50, 200, 400, 600, 800 };
int NUM_KEYS = 5;
int adc_key_in;
int key = -1;
int oldkey = -1;
// Convert ADC value to key number
int get_key(unsigned int input)
{
int k;
for (k = 0; k < NUM_KEYS; k++)
{
if (input < adc_key_val[k])
return k;
}
if (k >= NUM_KEYS)k = -1; // No valid key pressed
return k;
}
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)
{
case 0:Serial.println("S1 OK");
break;
case 1:Serial.println("S2 OK");
break;
case 2:Serial.println("S3 OK");
break;
case 3:Serial.println("S4 OK");
break;
case 4:Serial.println("S5 OK");
break;
}
}
}
}
delay(100);
}
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