/*
 * Traffic lights
 * By: Luis Alejandro Domínguez Bueno
 * On: 2024/02/15
 */
#define LED_PIN 2
#define PWM_CHANNEL 0
#define PWM_FREQUENCY 1000
#define PWM_PRECISION 8

int waitingTime;

void setup() {
  ledcSetup(PWM_CHANNEL, PWM_FREQUENCY, PWM_PRECISION);
  ledcAttachPin(LED_PIN, PWM_CHANNEL);
  randomSeed(analogRead(0));
}

void loop() {
  waitingTime = random(5, 10);

  for (int i = 0; i < 255; i++) {
    ledcWrite(PWM_CHANNEL, i);
    delay(waitingTime);
  }

  delay(1000);

  for (int i = 255; i >= 0; i--) {
    ledcWrite(PWM_CHANNEL, i);
    delay(waitingTime);
  }

  delay(1000);
}