ttp229touch.ino

/*
Connections
VCC ----- 5V/3.3V
GND ----- GND
SCL -----> D12
SDO -----> D13

Note: If using 3.3V logic boards like Pro Mini or ESP8266, connect VCC to 3.3V.
*/

#define pulse 12
#define data 13

int old  = 0;

void setup() {
  Serial.begin(9600);
  pinMode(pulse, OUTPUT);  
  pinMode(data, INPUT); 
}

void loop() {
  int Key = getkey();
  if (Key!=0&Key!=old) {
    Serial.print("BUTTON PRESSED:--> ");
    Serial.println(Key);
  }
  old = Key;
  delay(100); //Debounce
}

byte getkey(void) {
  byte cnt;
  byte num = 0;
  for(cnt = 1; cnt < 17; cnt++) {
    digitalWrite(pulse, LOW); 
    if(digitalRead(data) == 0)
      num = cnt;
    digitalWrite(pulse, HIGH);
  }  
  return num; 
}