신호등이 빨간불일 때 초음파 센서가 켜지도록 하고 싶습니다. 조건문을 어디에 어떻게
 
작성해야 하는지 궁금합니다.
 

#define LED_R 3
#define LED_Y 4
#define LED_G 5
 
void setup() {
  // put your setup code here, to run once:
  pinMode(LED_R, OUTPUT);
  pinMode(LED_Y, OUTPUT);
  pinMode(LED_G, OUTPUT);
}
 
void loop() {
  // put your main code here, to run repeatedly:
  turnOffAll();
  
  digitalWrite(LED_R, HIGH);
  delay(10000);
  turnOffAll();
 
  digitalWrite(LED_Y, HIGH);
  delay(2000);
  turnOffAll();
 
  digitalWrite(LED_G, HIGH);
  delay(10000);
  turnOffAll();

  digitalWrite(LED_Y, HIGH);
  delay(2000);
  turnOffAll();
}
 
void turnOffAll() {
  digitalWrite(LED_R, LOW);
  digitalWrite(LED_Y, LOW);
  digitalWrite(LED_G, LOW);
}