Semáforo com ESP32

1// ─────────────────────────────────────────
2//   BlueGrays · bluegrays.com
3//   ESP32 Traffic Light
4// ─────────────────────────────────────────
5// A traffic light cycle with red, yellow and green LEDs: red 3 s, red +
6// yellow 0.8 s, green 3 s, yellow 0.8 s.
7//
8// Pins:
9//   GPIO 5  -> Red LED
10//   GPIO 18 -> Yellow LED
11//   GPIO 19 -> Green LED
12//   Each LED with a 220 ohm resistor, cathodes to GND
13
14const int RED = 5;      // Red LED pin
15const int YELLOW = 18;  // Yellow LED pin
16const int GREEN = 19;   // Green LED pin
17
18void setup() {
19  pinMode(RED, OUTPUT);
20  pinMode(YELLOW, OUTPUT);
21  pinMode(GREEN, OUTPUT);
22}
23
24void loop() {
25  // Red
26  digitalWrite(RED, HIGH);
27  digitalWrite(YELLOW, LOW);
28  digitalWrite(GREEN, LOW);
29  delay(3000);
30
31  // Red + Yellow
32  digitalWrite(YELLOW, HIGH);
33  delay(800);
34
35  // Green
36  digitalWrite(RED, LOW);
37  digitalWrite(YELLOW, LOW);
38  digitalWrite(GREEN, HIGH);
39  delay(3000);
40
41  // Yellow
42  digitalWrite(GREEN, LOW);
43  digitalWrite(YELLOW, HIGH);
44  delay(800);
45  digitalWrite(YELLOW, LOW);
46}
47