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Digital Output: LED Blink | NexaLearn IoT Lab | NexaLearn

Digital I/O20 دقيقة

Digital Output: LED Blink

The iconic 'Hello World' of the hardware world. Make the built-in LED blink.

Lesson Content

Arduino's core functions are split into two parts: - setup(): Commands that run once when the board powers on, used for initialization (like setting a pin as output). - loop(): Commands that repeat forever (like turning an LED on then off). Digital output means only two states: either 5V (HIGH) or 0V (LOW).

Components Needed

Arduino Uno

Wiring Notes

In this lesson we need no external components. We'll use the built-in LED on Arduino which is internally connected to pin 13.

Code Example

void setup() {
  pinMode(13, OUTPUT); // تهيئة المنفذ 13 كمخرج
}

void loop() {
  digitalWrite(13, HIGH); // تشغيل الليد (5 فولت)
  delay(1000);            // انتظار ثانية
  digitalWrite(13, LOW);  // إطفاء الليد (0 فولت)
  delay(1000);            // انتظار ثانية
}

Common Mistakes

Forgetting the semicolon (;) at the end of every programming line, causing a Compilation error.

Try in Simulator

Open in Wokwi Simulator

Next Lesson

Understanding the Breadboard