//initialize pins
const int ledRed = 0;
const int swRed = 2;

void setup() {
  // set up pinouts: pin 0 output, pin 2 input
  pinMode(ledRed, OUTPUT);
  pinMode(swRed, INPUT);

}

void loop() {
  // switch circuit 5v pull-down resistor trigger
  int stateButton = digitalRead(swRed);
  if(stateButton == HIGH){
    digitalWrite(ledRed, HIGH);
  }
  else{
    digitalWrite(ledRed, LOW);
  }
}