Systems & hardware
Arduino
An open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board.
- Created by
- Massimo Banzi , David Cuartielles , Tom Igoe , Gianluca Martino , David Mellis
- First appeared
- 2005
- Official resource
- Visit the main website
Your first program
Hello, World!
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
}
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
}Keep learning
Where to go from here
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Official resource
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Teach me the basics of Arduino. Use https://code.study/arduino as the starting point. Explain what Arduino is best suited for, when I should not choose it, how to install or try it, and then walk me through its Hello World example step by step.
Content reviewed August 2026 · Start with primary sources and verify version-specific details.