// Перекрёсток: Светофор A и Светофор B
// A: D9 - красный, D4 - жёлтый, D2 - зелёный
// B: D5 - красный, D6 - жёлтый, D3 - зелёный
 
const int A_RED    = D9;
const int A_YELLOW = D4;
const int A_GREEN  = D2;
 
const int B_RED    = D5;
const int B_YELLOW = D6;
const int B_GREEN  = D3;
 
const int GREEN_TIME   = 4000;
const int BLINK_DELAY  = 300;
const int GREEN_BLINKS = 4;
const int YELLOW_TIME  = 2000;
const int RED_YELLOW   = 1500;
 
// ------------------ Вспомогательные функции ------------------
 
void blinkGreen(int pin) {
  for (int i = 0; i < GREEN_BLINKS; i++) {
    digitalWrite(pin, LOW);
    delay(BLINK_DELAY);
    digitalWrite(pin, HIGH);
    delay(BLINK_DELAY);
  }
}
 
void phaseA() {
  delay(GREEN_TIME);
  blinkGreen(A_GREEN);
 
  digitalWrite(A_GREEN, LOW);
  digitalWrite(A_YELLOW, HIGH);
  delay(YELLOW_TIME);
  digitalWrite(A_YELLOW, LOW);
 
  digitalWrite(A_RED, HIGH);
 
  digitalWrite(B_YELLOW, HIGH);
  delay(RED_YELLOW);
 
  digitalWrite(B_RED, LOW);
  digitalWrite(B_YELLOW, LOW);
  digitalWrite(B_GREEN, HIGH);
}
 
void phaseB() {
  delay(GREEN_TIME);
  blinkGreen(B_GREEN);
 
  digitalWrite(B_GREEN, LOW);
  digitalWrite(B_YELLOW, HIGH);
  delay(YELLOW_TIME);
  digitalWrite(B_YELLOW, LOW);
 
  digitalWrite(B_RED, HIGH);
 
  digitalWrite(A_YELLOW, HIGH);
  delay(RED_YELLOW);
  digitalWrite(A_YELLOW, LOW);
  digitalWrite(A_RED, LOW);
 
  digitalWrite(A_GREEN, HIGH);
}
 
void setup() {
  pinMode(A_RED, OUTPUT);
  pinMode(A_YELLOW, OUTPUT);
  pinMode(A_GREEN, OUTPUT);
 
  pinMode(B_RED, OUTPUT);
  pinMode(B_YELLOW, OUTPUT);
  pinMode(B_GREEN, OUTPUT);
 
  digitalWrite(A_GREEN, HIGH);
  digitalWrite(B_RED, HIGH);
}
 
void loop() {
  phaseA();
  phaseB();
}