#define RLED 23
#define BLED 22
#define PIR 21
#define GLED 2

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(RLED, OUTPUT);
  pinMode(BLED, OUTPUT);
  pinMode(GLED, OUTPUT);
  pinMode(PIR, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(PIR)==1){
    digitalWrite(RLED, HIGH);
    delay(500);
    digitalWrite(RLED, LOW);
    digitalWrite(BLED, HIGH);
    delay(500);
    digitalWrite(BLED, LOW);
  }else{
    digitalWrite(GLED, HIGH);
    digitalWrite(GLED, LOW);
    delay(500);
  }
}