#define DEBOUNCE_TIME 15
#define STATE_TO_TRIGGER 0
bool currState;
bool prevState;
unsigned long previousRead = 0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(7, INPUT_PULLUP);
  currState = digitalRead(7);
  prevState = currState;
}

void loop() {
  // ทำให้ไมโครคอนโทรลเลอร์สามารถอ่านปุ่มเมื่อเวลาผ่านไปครบเท่านั้น
  if(millis() - previousRead >= DEBOUNCE_TIME){
    currState = digitalRead(7);
    previousRead = millis();
  } 

  if(currState != prevState){
    if(currState == STATE_TO_TRIGGER){
      Serial.println("Hello");
    }
  }
  prevState = currState;
}