This project shows how to build a LED illumination ring that can be directly attached to Dremel drill. It uses 20 sunny-white SMD LEDs and help you illuminate the work surface.
Until yesterday I was not happy with lighting when drilling PCBs: It was either too dark or there were cast shadows (of my fingers or the drill itself). So I had to concentrate hard on drilling all the holes correctly centered where they belong. But now my problem is solved
Improved illumination for drilling PCBs - [Link]
In this project Markus shows us how he build a 7 segment RGB LED display by replacing the individual leds of the display.
7-segment LEDs are available in red, green, yellow and blue (maybe even in white?). There don’t seem to be any in RGB though, so if you want to dynamically use different colors in your project you either have to use multiple devices or use a different technology.
So this seemed like an opportunity for a nice DIY project: Why not take an existing 7-segment display, remove the original LEDs and add some RGB ones?
7-Segment RGB-LED – [Link]
This project is a POV able to be attached on the bicycle wheels. It has a row of 32 LEDs on each PCB and is able to create a Persistence of Vision (POV) effect. Check schematic and construction details on the link below.
POV on Bicycle Wheels – [Link]
This project shows how to build a LED clock that simulates the hands of a traditional clock using rows of LEDs. It also has a ‘digital’ mode, where the LEDs are used to display the time in digital way. Clock is based on PIC 16f877 microcontroller. Check schematics and construction details on the link below. [via]
‘Analog’ LED Clock - [Link]
This project I made for my little daughter. It is 24 channel light illumination. The schematic is very simple 24 LEDs, 1 MCU and some additional components. The main principle is dynamic indication, which is usually implemented for control of 7-segment digital indicators. Here is the same, as for indicators are used traditional 5-mm LEDs.
LED effects - [Link]
This project demonstrates the use of PWM wave to control the brightness of an LED. By changing the duty cycle of PWM, the average DC output can be varied, which is used to drive an LED. The microcontroller used is PIC16F628A, and programming is done in mikroC. PIC16F628A has an in-built Capture/Compare/PWM (CCP) module for which the I/O pin is served by RB.3 (Pin No. 9). And mikroC has built-in library functions for PWM hardware that makes the job easy.
Use of PWM to control the brightness of a LED - [Link]
This project shows how to build a LED candle light. It simulates the fire by varying the light intensity of the led and achieves flickering. It is based on PIC12F675. Find schematic and source code on the link below.
Led Candle - [Link]
This project shows a PIC16F84 Led dual Dice. Check video, schematic and source code on the link below.
Led Dual Dice on PIC16F84 - [Link]
This project is a 8 LED chaser using pic 16F628A. It is using PWM to control brightness of each LED along with a single mode control switch. LEDs have four levels of intensity: off, dim, mid, bright. Check schematic and source code on the link below.
8 Channel PWM LED Chaser using 16F628A – [Link]
This project is an alternative hard disk activity indicator build using 10 LEDs. It works by rotating the LED light like a dekatron tube. The article explores many ways to connect the hard disk activity indicator to motherboard and concluded to negative edge triggered with a lowpass filter. On the link below you can find construction details and schematics. [via]
Spindicator: hard-disk activity indicator – [Link]