Example Code for Arduino-Blink

Last revision 2026/01/14

This article guides readers through the process of making an onboard LED blink using Arduino and an ESP32 microcontroller, providing a simple code example and necessary preparations.

Hardware Preparation

Software Preparation

Sample Code

Init onboard LED as output, blink cyclically with 1s interval.

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Result

Onboard LED blinks infinitely (1s on, 1s off).

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