int buttonState = 0;  
void setup(){
Serial.begin(115200);
Serial.print("FABLAB HONG KONG CMASS iSPACE | TEST CODE FOR ESP32 BLINK");
pinMode(23, INPUT);
pinMode(22, OUTPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(23);
  if (buttonState == HIGH) {
  digitalWrite(22, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // wait for a second
  digitalWrite(22, LOW);    // turn the LED off by making the voltage LOW
  delay(500);                       // wait for a second
   } else {
  // turn LED ON:
    digitalWrite(22, HIGH);
     }
}