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The Basics Behind Constant-Current LED Drive Circuitry

This technical brief discusses the reasoning behind and implementation of constant-current drive circuitry for illuminating LEDs.

August 23, 2016 by Robert Keim

How to Perform UV Monitoring with the Adafruit Si1145

Environmental monitoring sensors help us to better measure the world around us. This article will help you understand why the amount of UV light reaching you changes over time and how to measure it over I²C using the Si1145.

August 03, 2016 by Mark Hughes

Driving LED Arrays with an Arduino

All you need to know about LED arrays. If you want to learn about them, drive one using an Arduino, or build them, this is the place to start.

July 11, 2016 by Cezar Chirila

Timing Light Sequences: Build a Traffic Light Controller with an Arduino MEGA

Learn how to simulate a traffic light using an Arduino.

June 22, 2016 by Joseph Corleto

Build a 4-Bit Binary Counter with 5x7 LED Matrix

In this project, you'll learn how to build a 4-bit binary counter using a 5x7 LED matrix for data count value visualization. The project will use a combination of standard electronic and surface mount components.

June 20, 2016 by Don Wilcher

How to Build a Control Circuit with Adjustable Working Time via Wi-Fi

Learn how to build a system that can turn DC loads on and off using a mobile application. You'll also learn how to perform this task via immediate actions or via timers set in advance.

June 15, 2016 by Yahya Tawil

Turning on a Light with Ultrasonic Motion Detection

This project will show you how to connect an ultrasonic sensor and an Arduino to turn on a light when motion is sensed.

May 13, 2016 by Alexander Fonseca

Characteristics of the Ideal Silicon Diode

In this article, we will discuss some characteristics of the ideal diode. We'll also learn how to analyze circuits that contain more than one ideal diode in conjunction with resistors and DC power sources.

May 06, 2016 by Donald Krambeck

Use a DC Motor to Power LED Headlights on a Longboard

Build a generator-powered LED headlight for a longboard for very cheap.

April 20, 2016 by Jacob Smith

Create a Laser Detection System Using a PICAXE

Lasers are plentiful, inexpensive, and fun to use. Here's a target that reacts when it's hit by a laser beam.

February 16, 2016 by Charles R. Hampton

How to Eliminate Ground Loops with Signal Isolation

This project explains how to isolate signals to eliminate ground loops in electronic systems.

January 29, 2016 by Orrin Bigelow

Using Scilab GUI for RGB and Lux Measurements

Gather data via USB from a BH1745NUC optical sensor and then display color characteristics and illuminance values.

January 28, 2016 by Robert Keim

Design a Color Sensor with Measurements Displayed via an RGB LED Module, Part 2

Learn how to collect and process RGB data generated by the BH1745NUC color sensor IC.

January 23, 2016 by Robert Keim

Design a Color Sensor with Measurements Displayed via an RGB LED Module

Display colors by precisely controlling the intensity of red, green, and blue LEDs.

January 22, 2016 by Robert Keim

Measuring and Calculating Lux Values, Part 2

Use data from an RGB sensor to improve the accuracy of illuminance measurements.

January 15, 2016 by Robert Keim

Measuring and Calculating Lux Values

Learn how to translate the output of a photosensor into an illuminance measurement.

January 13, 2016 by Robert Keim

LED Chaser… With a Twist!

Build an LED chaser with a little twist: we'll be using a microcontroller and an LCD along with the usual 4017 counters.

January 12, 2016 by Jens Christoffersen

Understanding Illuminance: What’s in a Lux?

A practical introduction to quantifying perceived light intensity.

January 11, 2016 by Robert Keim

Design a Luxmeter Using a Light Dependent Resistor

Take a few minutes to characterize a light dependent resistor (LDR) and you can build a simple and reasonably accurate light meter can be built using an LDR and an Arduino.

December 13, 2015 by David Williams

Build Raspberry Pi Controllers: LED Flasher

In this project, you'll learn how to wire an LED and flash it using the Raspberry Pi. Also, to isolate the Raspberry Pi's + 3.3VDC compliant output pins from supply voltages greater than this power source, an opto-isolator will be introduced as well.

December 11, 2015 by Don Wilcher