chipKIT Project 5: Digital stopwatch on seven segment LED display

Raj of Embedded Lab has a series of chipKIT tutorials.  This 5th project will show you how to build a digital stopwatch  on seven segment LED display with the chipKIT Uno32: In this project, we will use the chipKIT Uno32 board to build a digital stopwatch capable of timing minutes, seconds, and 1/10th of seconds, and with a […]

A quick and dirty methods to drive 7-segment LED displays directly with a microcontroller and no external components

Scott Harden writes: I came across the need for a quick and dirty display to show a 4 digit number from a microcontroller. The right way to do this would be to use a microcontroller in combination with a collection of transistors and current limiting resistors, or even a dedicated 7-segment LED driver IC. The […]

LED ring based illumination for American optical microscopes

TomKeddie writes: Based on a recommendation in these forums I bought an American Optical 570 stereo microscope on ebay some time back. I added the illumination shown below, I thought it might be useful to others. I cut 3 pieces from a right angle piece of aluminium section, coated them in heatshrink, attached them to […]

SquareWear Mini chainable color LED matrix and animation design tool

Ray Wang writes about his recently completed project, the SquareWear Mini with All-New Chainable Color LED Matrix, and an Interactive Animation Design Tool. The goal is to make standalone programmable color display gadgets. The LED matrix is chainable and can be seamlessly extended in both X and Y directions. The SquareWear Mini is essentially an […]

Valentine LED chaser

As Valentines day is fast approaching, many are thinking of a wonderful present to their love ones. Tom built this heart-shaped LED chaser and wrote a post on his blog detailing it’s assembly: The object of your desire will not be able to resist a heart-shaped LED chaser, lovingly hand-crafted on perfboard with a CD4017B decade counter […]

DIY 3W constant current LED driver

Dilshan Jayakody wrote a post on his blog about his 3W constant current LED driver: This is quick post about 3W constant current LED driver which I was design to combine with some homemade furniture piece. The main components of this system is LM311 voltage comparator and IRF9640 P-Channel MOSFET. This module is design to drive maximum of […]

Making a mini LED Christmas tree

Raj just finished his mini LED Christmas tree project: My two and a half year old son loves toys with flashing lights. For this Christmas I thought of making a mini LED Christmas tree for him. This project uses 22 multi-color LEDs which are driven by a PIC12F683 microcontroller using the Charlieplexing technique. The details […]

Light up your XMAS from your Smartphone

Boris of Open Electronics writes: This post is about a light animation game that can light up your Christmas. There’s Bluetooth, Android and audio files: a perfect festive mashup. A spectrum analyzer will help us color the winter festivities. Every year at Christmas we always want to try something new for lighting up our decorations: […]