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16 Sep 2010

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]

16 Sep 2010

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]

14 Sep 2010

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]

13 Sep 2010

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]

8 Sep 2010

This is a really impressive clock made using 60 RGB SMD Leds, making any color palette possible. It uses an Arduino, 12 LED drivers and 60 RGB Leds. All the functions of the clock are controlled via a capacitance switch that is hidden behind the infinity logo at the bottom of the clock. [via]

In this version of the software the color palette cycles through the colors of the rainbow twice a day. There is a light sensor to make sure that the intensity is tuned down in the dark.

Equinox Clock - [Link]

7 Sep 2010

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]

5 Sep 2010

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]

4 Sep 2010

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]

4 Sep 2010

This project shows how to build a LED binary only calculator. [via]

You can’t calculate binary values “as is” on most handheld calculators and using the windows one is just a pain, so i decided to make my very own (binary only) calculator. This calculator supports all the basic functions like : NOT,OR,AND,XOR, addition,subtraction,multiplication,division and modulo.

So join me as we are going to enter the world of ones and zeros and play with some LEDs and switches along the way!

Make your own LED binary calculator - [Link]

1 Sep 2010

LED’s are great display tools. Their prices have decreased to a point where they are replacing more conventional light sources. In one sense their characteristic need for low voltages is an advantage e.g compatibility with I.C drives, but this voltage requirement can also be a disadvantage. I wanted to light some LED’s in a simple sign application, nothing fancy, but I needed to decrease the utility line voltage to a LED-compatible value for this application.

A power source for simple LED projects - [Link]





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