A self-expanding ESP32 PWM board

Eric Gunnerson writes: I’ve been working on a little ESP32 expansion board/shield for an LED project I’ve been working on. One of the nice things about the ESP32 is that it has a peripheral known as “LED control” that provides 16 independent channels of PWM for controlling LED brightness, and my project uses that capability. […]

Control the bicycle traffic signal with a Particle Photon

Glen has been working on a Wi-Fi enabled bicycle traffic signal project: In the first post in this series, we built a miniature LED bicycle traffic signal using 3D printing, laser cutting, a sticker, and an Adafruit Neopixel Jewel. In this post, we’ll look at bringing the signal to life using a Particle Photon. We’ll […]

Homebrew DMX-controlled RGB LED light

Glen has written an article detailing his homebrew DMX-controlled RGB LED light: This project is a small DMX-512 controlled, color-changing RGB LED light. The light can be controlled via the DMX512 protocol or it can run a number of built-in programs depending on how the software is configured. The light incorporates an advanced 16-bit PIC24 microcontroller with […]

Game of Life on a Raspberry Pi (and a LED board) in Haskell

Trandi published a Game of Life on a Raspberry Pi in Haskell project, that is available on Github: This is a quick post about, re-purposing my Raspberry Pi + Peggy2 art installation, which already re-purposes a 8-9 years old Peggy2 LED board, to play Conway’s Game of Life. More details on Robotics /Electronics /Physical Computing blog. […]

Lightronome 1 – The light based metronome

Zoltán Gomori documented his lightronome build: I got a request, to design and build an electronic metronome. You can find several on the market, but the problem it is ether producing voice or the classical mechanical metronome. The requirement here was a visual effect. To be precise four LEDs for 4/4 beat. It is required for drumming […]

Driving a 48-segment RGB LED bar graph with a Teensy 3.2

Glen Akins writes: In my post Driving a SparkFun 48-Segment RGB LED Bar Graph, I stated that the hardware built there could be used to drive the LED bar graph with any combination of hardware and software that could drive one of the common 32×32 or 32×16 RGB LED matrices. Today I’m back to prove […]

Creating custom 3D printed LED bar graphs

Glen Akins has a nice build log on his 3D printed LED bar graphs: While building my zombie containment unit, I decided I wanted some LED displays or bar graphs to complement the containment status video running on the smaller secondary video monitor. Some other containment units used LED air pressure gauges from eBay. I […]

Individually addressable incandescent lamps

Michael wrote an article on controlling a bunch of lamps individually with WS2811 drivers and Arduino: I simply used the same technology as LED strips to allow communication between lamp modules. LED strips have RGB LEDs with an embedded driver chip which uses PWM (pulse width modulation) to control the duty cycle on the red, […]

An Arduino Knight Rider Rainbow dice that uses WS2812B RGB LEDs

An Arduino Knight Rider Rainbow dice built using a clock by Davide Gironi: This project implements a Knight Rider / Rainbow effect Random Selector. It uses an Arduino UNO and a WS2812B RGB led strip. A friend of mine needs a random selector for train scale model. I’ve developed this using the Arduino framework, because […]

Programming an 8 digit 7-segment display, the easy way, using a Max7219

Allan Schwartz shows off the easy way to interface 7-segment displays using the MAX7219: Previously, in part 1 of my blog posting Programming a 7-segment Display, using just Arduino digital pins (the hard way) we had demonstrated how to hook up a pair of 7-segment displays to an Arduino, treating each individual segment as a […]

Comfort Thermometer display built with 517 individual LEDs

Richard wrote in to tell us about a ‘Comfort Thermometer display built with 517 LEDs’ that he has just finished building: Comfort Thermometer Display built with 517 individual LEDs and the following microprocessors: 1) PiC24FV16KA301 – controlling outer 36 RGB LEDs 2) PIC16F886 – bargraph and pink LEDs animations 3) ATmega328 – controlling 7-segment display […]

LED candle effect: Tear down and decap of a controller

A teardown video from Electronupdate: A dollar store item which implements a flickering candle effect using and LED. A look at the technology: linear feedback shift register or ROM based? Let’s decap the controller and take a look at the silicon die to find out! More details at Electronupdate blog.