กลับไปหน้ารวมไฟล์
make-a-simple-led-circuit-ac72a8-en.md

Hello World: The Simple LED Circuit

Before you can build robots or smart homes, you must master the fundamental building block of electronics: the LED Circuit. This project teaches you how to control a digital output and protect your components from damage.

button_led_basic_interaction_1772681969235.png

Why use a Resistor?

The most important lesson in this project is Current Limiting. An LED is a diode with very little internal resistance. If you connect it directly to the Arduino's 5V pin, it will draw too much current and burn out instantly.

  • The Solution: We place a 220-ohm resistor in series with the LED to limit the current to a safe level (around 20mA).

The Hardware

  • Arduino Uno: Used here as a 5V power source.
  • LED (any color): The output device.
  • 220-ohm Resistor: The protector.
  • Breadboard and Jumper Wires: For clean, solderless connections.

arduino_blink_header.png

What You'll Learn

By building this, you'll understand polarities (the Anode + and Cathode - of an LED) and the basic layout of a breadboard. It's the simplest project there is, but it's the foundation for every blinking light, indicator, and screen in the world.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Simple LED Circuit"
description: "The classic start! Learn how to light up an LED safely using an Arduino and understand the basics of resistors and current flow."
category: "Basic Electronics"
difficulty: "Easy"