void setup() {
  // put your setup code here, to run once:
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  Serial.begin(9600);
  analogReference(DEFAULT);
}

void loop() {
  // put your main code here, to run repeatedly:
  //Leitura do tempo definido pelo potenciômetro:
  long int timer = analogRead(A0);
  float timer_V = 5*timer/1023;
  float time = map(timer_V,0,5,10,30);
  //Serial.println(time,2);

  //Definição dos tempos de cada sinal:
  float time_green = time*1000;
  float time_yellow = (time-6.75)*1000;
  float time_red = time*1000;

  //Sinal verde:
  digitalWrite(10, HIGH);
  delay(time_green);
  digitalWrite(10, LOW);

  //Sinal amarelo:
  digitalWrite(8, HIGH);
  delay(time_yellow);
  digitalWrite(8, LOW);
  delay(250);
  pisca_amarelo();
  
  //Sinal vermelho:
  digitalWrite(9, HIGH);
  delay(time_red);
  digitalWrite(9, LOW);
  
}

void pisca_amarelo() {
  digitalWrite(8, HIGH);
  delay(2000);
  digitalWrite(8, LOW);
  delay(250);

  digitalWrite(8, HIGH);
  delay(2000);
  digitalWrite(8, LOW);
  delay(250);

  digitalWrite(8, HIGH);
  delay(2000);
  digitalWrite(8, LOW);
}