int LED = 8;
int PushButton = 7;
int state = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED, OUTPUT);
  pinMode(PushButton, INPUT_PULLUP);
  digitalWrite(LED, LOW);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  state = keyGetNum(PushButton);
  //Serial.print(state);
  if (state == HIGH)
  {
    digitalWrite(LED, HIGH);
    delay(50);
  }
  digitalWrite(LED, LOW);
  
}


/*get key state using debounce*/
int keyGetNum(int key)
{
  if(digitalRead(key) == LOW)
  {
    delay(20);
    //Serial.print(digitalRead(key));
    while(digitalRead(key) == LOW);
    Serial.println("pushed.");
    delay(20);
    state = 1;  //voltage on pin is different from the key state
  }
  return state;
  //Serial.println(state);

}