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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

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

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

Control Your AC Mains with a Microcontroller

Learn how to put together your own toaster oven controller with a handful of inexpensive, through-hole parts. The emphasis is on safety, low price, and minimal modification of the toaster oven.

November 09, 2015 by Patrick Lloyd

Make an Analog Sound Reactive LED Strip

This analog design allows your LEDs to respond to your music. Just plug your music source into this which sends a channel to your sound system and some LEDs.

October 28, 2015 by Fadi Kasem

Make an LED Light Strip AHRS with Arduino and MPU-6050

Use a WS2812 RGB LED strip to visualize the pose of an MPU-6050 6-degree-of-freedom IMU in three dimensional space.

October 13, 2015 by Patrick Lloyd

Light Bar “Relative Comfort” Thermometer with NodeMCU

Create a wireless "relative comfort" light bar thermometer by broadcasting temperature data across multiple ESP8266 modules running NodeMCU using MQTT.

September 28, 2015 by Patrick Lloyd

Ambient Light Monitor: Using a Triac to Adjust Lamp Brightness

Part 5 in the “How to Make an Ambient Light Monitor” series.

September 01, 2015 by Robert Keim

Ambient Light Monitor: Zero-Cross Detection

Part 4 in the “How to Make an Ambient Light Monitor” series

August 16, 2015 by Robert Keim

Ambient Light Monitor: Understanding and Implementing the ADC

Part 2 in the "How to Make an Ambient Light Monitor" Series. Our smart ambient light monitor will need to digitize and analyze signals from an optical detector, so it is time to explore the EFM8’s integrated analog-to-digital conversion functionality.

August 05, 2015 by Robert Keim

Ambient Light Monitor: Measuring and Interpreting Ambient Light Levels

Part 3 in the “How to Make an Ambient Light Monitor” series. The project continues by building an ambient light sensor circuit on a breadboard, digitizing the circuit’s output signals, and interpreting the digitized measurements.

August 05, 2015 by Robert Keim

Ambient Light Monitor: Display Measurements on an LCD

Learn how to use an EFM8 microcontroller to convert current and voltage measurements to digits that can be displayed on an LCD. We'll discuss a convenient way to report analog-to-digital conversion values that represent current and voltage amplitudes.

July 26, 2015 by Robert Keim

Remote Viewing: Communicating with an Arduino via Infrared Light

An infrared (IR) light sensor allows the use of an Arduino to receive and decode signals from a TV remote control.

June 14, 2015 by Tim Youngblood

Use an Arduino to Control a Motor

Controlling a motor with an Arduino is relatively easy. In addition to simply spinning the motor, you can control the position of the motor shaft if the motor has a rotary encoder.

June 03, 2015 by Tim Youngblood

An Arduino-Controlled Light Sensor

Monitoring the output of a light-dependent resistor, or photoresistor, allows the Arduino to know how light or dark it is. When the light falls below a certain level, the Arduino turns on a couple of LEDs.

June 01, 2015 by Tim Youngblood