This example demonstrates how to use LDR as a switch; each time you cover the LDR, the LED is turned on (if it's off), and off (if it's on).

Receive the signal and control an LED.

The classic whack-a-mole game using LED lights and a joystick.

Everyone loved Knight Rider. I want to see more KITT scanners in the world.

This project combines the WS2812B RGB LED matrix and PIR motion sensor to greet visitors with a text.

Why you can blank, void setup()

Sending Bytes to an 8x8 LED Matrix.

In this project, we will print out Morse Code of a sentence typed in Serial Monitor by flashing LED for each word and space between them.

Pedestrian walk cycle will only occur when both lights are red AND button has been pressed.

Simulate a traffic light using an Arduino and LEDs! This project is super cool to watch and easy to make!

Use Arduino to run a spectacular Christmas light show. (Both in English and Spanish, en Ingles y Español.)

Snap Circuits® makes learning electronics easy and fun! These projects are designed for younger kids who want to get introduced IoT.

Extremely simple project, my first even. Four buttons. Three to choose RGB values, one to choose whether to subtract or to add.

This project will show you how to use an RGB LED.

Ten LEDs connected to an Arduino Uno and a potentiometer.

Because LED are fun - but addressable rocks. :)

Make a people counter that detects the number of people who enter the room using lasers and LDRs and control it with an Android app.

I taught a class on Communication Systems using programming, machines and Morse code.

This instruction will guide how to make shadow light box for next Christmas. You can make for yourself to decorate your room, or make it for

Uses a photo resistor to determine whether a room is bright, average or dark. It shows this using 3 LEDs and/or the serial monitor.

This project detects changes in temperature based on your specifications, and then changes the color of a LED to the color of your choosing.

A cheap DIY version of Nanoleaf RGB LIGHT with ATtiny85 and WS2812 RGB strip.

Set up your Arduino and Raspberry PI to control lighting and animation on an RGB led strip via AWS IoT and Alexa voice commands.

An alarm that triggers a siren sound an police lights when the beam of light is interrupted.