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Posts Tagged ‘LED’

Philips T8 LED tube teardown

Tuesday, May 3rd, 2016

In a previous post Electronupdate did a teardown of a 48" T8 Cree LED tube, this time a 48" T8 Philips LED tube.  

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48″ T8 Cree LED tube teardown

Tuesday, April 26th, 2016

Electronupdate has posted a teardown video of 48" T8 Cree LED tube: LED based replacements for old T8 fixtures are finally becoming reasonably priced. I see two old competitors back at it again: CREE, and Philips. Both bulbs attractively priced, both 4000K. I tore down the Cree 1st. Longest circuit...

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App note: The LED versus LCD decision

Sunday, April 17th, 2016

Choosing between two display types, LED and LCD discussed in this application note from Murata. Link here (PDF) Users of contemporary digital panel meters (DPMs) have a variety of options available to them. While options are nice, they invariably mean more choices have to be made. After determining what meter...

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App note: Eye safety of IREDs used in lamp applications

Sunday, March 20th, 2016

This application note from OSRAM describes the possible hazards of infrared LEDs (IREDs) used for lamp applications with respect to the IEC-62471 standard and how to classify IREDs according to different risk groups. Link here (PDF) As the radiated optical power of light emitting diodes (LEDs) has increased in recent...

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PWM dimmer for RGB LED

Monday, March 7th, 2016

Lukas Fassler has designed and built a PWM dimmer for RGB LED: In my last post I’ve described the design and construction of my LED dimmer project. This project here is similar but a bit more involved. It controls RGB LEDs so it can not only change the brightness but also...

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PWM dimmer for LED lighting

Friday, February 19th, 2016

Lukas Fassler has published a new build, a DIY PWM dimmer for LED lighting: I have recently moved to a new apartment and was looking for a PWM dimmer to control some 12V LED strips. I thought that should be easy enough nowadays but it proved more difficult than I thought. All...

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App note: Projection with LED light sources

Sunday, January 24th, 2016

LEDs are now mostly used in light projection systems due to their low power requirements, long life and robustness. Here's an app note from OSRAM for proper integrations on these projection LEDs. Link here (PDF) This application note provides insights into the use of LED light sources for projection applications....

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ESP8266 WiFI LED controller hack

Wednesday, December 30th, 2015

Andreas Hölldorfer of ChaozLabs wrote an article detailing how he hacked the cheap WiFi LED controller: This pictures show the PCB. As you can see there are pins labeled as RX,TX,GND,3.3V. I simply connected an USB-Serial converter to the pins. The two other pins are GND and GPIO0. If you set a...

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Posted in hacks, wireless | No Comments »

Replacement LED driver for AN6877

Friday, December 18th, 2015

Dilshan Jayakody writes: AN6877 is linear AF level meter IC produced by Panasonic and it is commonly found on many audio equipment. This chip is no longer manufactured by Panasonic and finding replacement chip for AN6877 is also quiet difficult. The circuit described in this article is design to replace AN6877...

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Posted in LEDs | 1 Comment »

Nifty USB LED light

Tuesday, July 7th, 2015

Isonno writes, "One of the hit discoveries of Hacker Camp 5 were these little USB lights. Plugs in either way, and you turn on/off/dim by touching the back. Turns out the show is run by a chip called the Sigma SGL8022W. The datasheet has the schematic." Via the forum.

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Posted in USB | 2 Comments »

LED POV fan update

Monday, July 6th, 2015

Zach writes: I first posted on how to reprogram a "Programmable Message Fan: Model 45 Series" POV fan a few years ago, and the code I posted no longer works with the current versions of the Octave and Arduino software.  The original post still describes how the fan works and...

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App note: Green LED replaces LDO regulator

Sunday, April 12th, 2015

App note(PDF) from MAXIM using a green LED as LDO for low power application Insystems in which a microcontroller must communicate with peripheral devices that operate at different supply voltages, a level translator may be necessary. This design idea explains how for lowpower loads, a single green LED can replace...

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Posted in app notes | 9 Comments »

Naked HDD activity indicator

Monday, March 16th, 2015

Frank Zhao of Eleccelerator writes: Remember my Aquarium Computer? I thought the SSD looked boring, so I put a old-school HDD inside with all the guts exposed, and wired it electrically to spin and swing when there is hard drive activity (when the HDD activity LED blinks). Project info at Eleccelerator page....

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App note: Chemical compatibility of LEDs

Sunday, March 8th, 2015

An app note(PDF) from OSRAM on LED stresses due to chemical compatibilities on their applications. The performance and stability of light emitting diodes (LEDs) may be influenced by various chemical incompatibilities arising from chemicals and materials used, amongst other things, in luminaire construction, or by gases in the proximate environment...

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App note: Thermal consideration of flash LEDs

Sunday, February 1st, 2015

LEDs maximum performance are primary determined by its thermal property stresses, See OSRAM's app note(PDF). This application note focuses on how to develop an adequate thermal management for LEDs in camera flash applications.

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ESP8266 powered web server + LED control + DHT22 temperature/humidity sensor reading

Wednesday, November 26th, 2014

Martin writes: The ESP8266 System-on-chip (SoC) has recently came out of nowhere and has been taking by storm the IoT DIY world. It is a $4.50 Wi-Fi capable chip that has remarkable specs, obsoleting overnight a number of similar products that are out there. The price factor, availability of SDK...

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Posted in Chips, hacks | 1 Comment »

The LED chasing effect project using Atmel AVR microcontroller

Friday, October 10th, 2014

rwb over at Ermicro writes: In this project we are going to use both the Arduino IDE and Atmel AVR Studio to program the AVR ATMega168 microcontroller, therefore you could learn to use these well known Integrated Development Environment (IDE) to program the project.

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Posted in Arduino, AVR | No Comments »

BlinkyTile: Build your own dynamic light sculptures

Wednesday, September 24th, 2014

Matt Mets, our hacker friend,  has announced that the BlinkyTile is now being offered on Kickstarter! He writes, "BlinkyTile is a system of LED lights on pentagonal tiles for creating dynamic light sculptures in any shape you can imagine!"  

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Frequency counter with PIC16F628A

Tuesday, September 23rd, 2014

xristost blogged about the frequency counter module he made: First of all I wanted a PIC microcontroller to do the whole job without any additional ICs. Also I wanted to use the the familiar 16F628A, but because one of the portA pins (RA5) can be used only as input I was short...

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Posted in DIY, PIC | 9 Comments »

DIY word clock

Wednesday, September 3rd, 2014

Want to build your own world clock? Check out Wouter's DIY word clock instructables: ...I have found one DIY project that really stands out: Elektronika.ba's wordclock, proving that it is possible to build your own wordclock that is as pretty as the original.  Also, here is a video of the...

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