🛠 Faire clignoter une LED avec l'ESP32-S2

Objectives

Discover digital output on the ESP32-S2: configure a GPIO pin as an output, set it to high then low, and insert delays to achieve regular blinking.

Hardware

• ESP32-S2 development board (DevKitM-1 type)
• 1 red LED (or the onboard LED if your board has one)
• 1 330 Ω resistor
• 2 Dupont cables and a breadboard

Complete code

// Clignotement LED sur ESP32-S2
const uint8_t LED_PIN = 2;

void setup {
  pinMode(LED_PIN, OUTPUT);
}

void loop {
  digitalWrite(LED_PIN, HIGH);  // LED allumée
  delay(500);
  digitalWrite(LED_PIN, LOW);   // LED éteinte
  delay(500);
}

Expected verification

Upon upload, the LED blinks once per second: 500 ms on, 500 ms off. Modify the value of delay to change the speed and confirm that the rhythm follows.

Common errors

• Wrong pin: the onboard LED on some S2 boards is not on GPIO2; check your board's schematic.
• Missing resistor: the LED may shine too brightly or degrade.
• Anode/cathode inversion: the long leg (anode) goes to the resistor, the short leg to GND.
• Wrong serial port selected in the IDE: the ESP32-S2 is available via both UART and native USB, test both ports.