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15 Apr 2011

Jon Chandler explorers the often overlooked calculations behind selecting the right resistor for an LED. This somewhat simple task is taken for granted by many, although it’s a world of mystery for others.

Got an LED and have no idea what resistor to use with it? Jon covers it step by step.

LED Calculations – [Link]

14 Apr 2011

pyroelectro.com writes:

Propeller clocks are nothing new to anyone who has been into electronics for a while. They use an idea called POV, Persistence Of Vision, which means that if something appears in the same spot consistently, at least 50-60 times per second, our brains think that it’s permanently there when it really is not. TV’s and Monitors use this method of display, so it’s not as uncommon as you might think.

After having seen so many propeller clock POV videos on Youtube, but no real description of how they work or how to build your own, I set out to make one and document how it was built. The Pyro Propeller Clock POV design criteria was short and sweet: be as simple as possible in order to encourage others to make their own, DIY style.

Pyro Propeller Clock POV – [Link]

13 Apr 2011

simoninns writes:

This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th wedding anniversary (since she puts up with my addiction to electronics I thought she deserved something in return!).

RGB LED Love Heart – [Link]

12 Apr 2011

dukezae2 writes:

Step by step instructions for how to build and implement the replacement surgical lamp bulb system using an LED circuit developed by Mohammed Shafir and Zoe Englander as part of the course BME 262-Design for the Developing World at the Pratt School of Engineering, Duke University.

Replacement for surgical lamp bulbs using LED circuit – [Link]


4 Apr 2011

In this project it was used the “Piranha Super-flux RGB” Led of common anode, and the PIC18F25K20, in order to generate combinations of colors. It has two function modes, automatic that generate the color sequence that is stored in the μC memory, and the manual mode in which you can select one of the seven possible colors.

Super Flux RGB LED Controller – [Link]

29 Mar 2011

plastibots.com writes: [via]

I’ve been involved in microcontrollers for some time – but of the LEGO Mindstorms flavour (and BASIC Stamp to a lesser extent). Lately, I’ve jumped on the Arduino bandwagon. I’ve always had the natural nack to fix pretty much anything that has batteries or a plug running out of it. As the Arduino revolution has picked up dramatically over the past few years, so to has my desire to do DIY projects around the house. At some point in the future, we plan a kitchen reno. Part of that reno will the addition of under-cabinet LED lighting. Since that is far off, but I also had the need for better lighting in my office, I figured this would be a great time to proto something for the kitchen upgrade, while making something functional for the office. So, here it is..

Dual LED Desk Light Controller – [Link]

29 Mar 2011

“RGB Lights for Mykle’s Lightbar” – nice work! [via]

RGB Lights for Mykle’s Lightbar – [Link]

29 Mar 2011

Multiplexing is the most common technique for interfacing multiple seven segment LED displays to microcontrollers. Read this experimental tutorial to find out how this technique works.

Multiplexing Seven Segment LED Displays – [Link]

28 Mar 2011

Pal documented the basics of driving a color changing LED with an Arduino. [via]

RGB LED with Arduino – [Link]

25 Mar 2011

Citizen Electronics Co., Ltd. recently reported having developed the LMC10B series of LED lighting modules with built-in AC drive circuits using innovative circuit technology.

LEDs are usually driven by DC (direct current) power supply. Where an AC (alternating current) power supply is used, a DC converter circuit is needed. Issues to be resolved with DC power driven LEDs include the complexity of the circuit increasing the number of components, and electrical noise generated. [via]

AC powered 22 watts 1000 lumen LED module – [Link]



 
 
 

 

 

 

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