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
- Download Arduino IDE: Click to download Arduino IDE.
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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