#define RLED 23
#define GLED 22
#define BLED 21
#define L_PIR 19
#define R_PIR 18
int stat = 0;

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

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(L_PIR)==1){
    stat = 1;
  }else if (digitalRead(R_PIR)==1){
    stat = 2;
  }else{
    stat = 0;
  }
  switch(stat){
    case 0:
      rotateRGB();
      break;
    case 1:
      rotateRG();
      break;
    case 2:
      rotateG();
      break; 
  }
}

void rotateRGB() {
  digitalWrite(RLED, HIGH);
  delay(500);
  digitalWrite(RLED, LOW);
  digitalWrite(GLED, HIGH);
  delay(500);
  digitalWrite(GLED, LOW);
  digitalWrite(BLED, HIGH);
  delay(500);
  digitalWrite(BLED, LOW);
}

void rotateRG() {
  digitalWrite(RLED, HIGH);
  delay(500);
  digitalWrite(RLED, LOW);
  delay(500);
  digitalWrite(BLED, HIGH);
  delay(500);
  digitalWrite(BLED, LOW);
  delay(500);
}

void rotateG() {
digitalWrite(GLED, HIGH);
delay(500);
digitalWrite(GLED, LOW);
delay(500);
}