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Posts Tagged ‘LEDs’

App note: Pulsed Over-Current Driving of LEDs

Sunday, May 20th, 2018

App note from CREE on driving LEDs over its specified current capability. Link here (PDF) The Applications Engineering team at Cree is often asked whether it is safe to operate Cree XLamp® LEDs with pulsed currents above the maximum data-sheet rating. This question is usually asked in the context of...

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App note: Avoidance of ceramic-substrate-based LED chip cracking induced by PCB bending or flexing

Sunday, May 13th, 2018

Application note from CREE on the causes of ceramic-substrate-based failures due to PCB board stresses and how to minimize their occurrence. Link here (PDF) Printed circuit board (PCB) bending and/or flexing is an unavoidable phenomenon that is known to exist and is easily encountered during electronic board assembly processes. PCB...

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App note: Preventing LED failures caused by corrosive material

Sunday, April 15th, 2018

Chemical compatibility of LEDs application note from OSRAM. Link here (PDF) 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 of LEDs during field...

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App note: LEDs for wearable applications

Sunday, April 15th, 2018

Brief app note from OSRAM, LEDs for heart rate monitoring through skin reflection of emitted light. Link here (PDF) This application note provides a short introduction into the general use of LEDs for wearable applications, with a focus on heart rate monitoring.

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App note: Advanced LED rework procedure for video wall and signage applications

Sunday, February 25th, 2018

App note from OSRAM about LED rework on signages and their demand for more sophosticated tools. Link here (PDF) SMT LEDs have became more and more popular in video wall and signage applications, replacing radial LEDs. This leads to more difficulties during the repair or replacement of failed LEDs on...

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App note: Matrix LED and where they are used

Sunday, February 25th, 2018

White paper about matrix LED usage from Integrated Silicon Solution Inc. (ISSI). Link here (PDF) People today come in contact with a wide range of consumer electronics (CE) devices in their daily lives. CE devices have become increasingly complex with added functionality enabled by MCU’s which provide the intelligence for...

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App note: 12Vac LED Driving without smoothing capacitors

Sunday, September 10th, 2017

Application note from Diodes Incorporated on driving 12Vac LED without smoothing capacitors with their Zetex ZXLD1360 LED driver IC and SBR2A40P1 super barrier rectifier. Link here (PDF) LED based architectural lighting is now coming of age, but there are still some problems to be considered when designing luminaires to be...

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App note: How to measure thermal resistance of LED emitters and LED arrays

Sunday, June 18th, 2017

Another white paper from Lumileds about LED thermal resistance. Link here (PDF) Thermal performance is the most critical factor of a well-designed LED lighting system. A lighting system with proper thermal design has higher efficacy, meaning more light can be extracted using less energy, and better long term reliability.

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App note: Flash for “Selfies”

Sunday, June 18th, 2017

Effective front facing camera flash discussed in this white paper from Lumileds. Link here (PDF) Smartphones are ubiquitous in everybody’s daily lives, a trend that shows no sign of slowing. A key component of the smartphone is the camera, which has gained market share over Digital Still Cameras due to...

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Comfort Thermometer display built with 517 individual LEDs

Thursday, December 29th, 2016

[embed]http://www.youtube.com/watch?v=9MXx4iAVi8o[/embed] Richard wrote in to tell us about a 'Comfort Thermometer display built with 517 LEDs' that he has just finished building: Comfort Thermometer Display built with 517 individual LEDs and the following microprocessors: 1) PiC24FV16KA301 - controlling outer 36 RGB LEDs 2) PIC16F886 - bargraph and pink LEDs animations...

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Happy Valentines day!

Sunday, February 14th, 2016

Sjaak built this blinky heart for his girlfriend this Valentines day. It is based on a MAX7219 and a PIC16f1823: My girlfriend persuaded me to start this hobby side project and as a favor I made her this blinky heart. I don’t want to buy a standard trumpery from the shop,...

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Daft Punk Thomas helmet (RGB LEDs + iPhone App)

Friday, February 20th, 2015

Marc made this cool DIY Daft Punk helmet and wrote a post on his blog detailing its assembly: It wasn't until June of 2014 when I was browsing through Sparkfun's New Product Post and I saw some LEDs that caught my eye. Now, I know the WS2811/2812 LEDs have been the...

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App note: LED lighting and supercapacitors

Sunday, December 28th, 2014

An app note (PDF) from KEMET on coupling two high lifetime devices: LEDs and Supercapacitors. Light emitting diodes, or LEDs, have come to prominence in recent years in conventional lighting applications including flash lights, street lamps, traffic lights and emergency lighting. Their advantages over incandescent and compact fluorescent light sources...

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Running LED dice

Tuesday, December 16th, 2014

Raj over at Embedded Lab has published a new build, a running LED dice using PIC12LF1822 microcontroller: This project is about a similar LED dice but with a slightly different output form. It uses 6 LEDs which are arranged in a circular pattern and are labeled 1 through 6. They create a...

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Controlling a PiGlow with the Bus Pirate

Thursday, September 4th, 2014

Aaron Brady has written an article on controlling a PiGlow with the Bus Pirate: PiGlow provides 18 dimmable LEDs and is designed to be used with a Raspberry Pi. It sits right on the GPIO header of the Pi. It doesn’t use actual GPIO pins though, because the PiGlow is actually based on...

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DirtyPCB IKEA Samtid mood-light upgrade

Saturday, August 30th, 2014

madworm writes: Just wanting to share one of my latest projects, made possible by DirtyPCBs. I got a lot of good boards (actually 2 designs) and saved 25$ using this service. Very nice. It's a simple thing, just a micro (ATmega168) + a bunch of WS2812B LEDs. Main purpose: more...

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Digital Zoetrope

Wednesday, July 23rd, 2014

Sholto wrote this instructable detailing the build of his digital zoetrope: A zoetrope is a mechanical device that animates a series of pictures by spinning them fast enough that the images appear to merge together and move, My digital zoetrope works on a similar principal, by flashing the LEDs while they...

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Proto I/Os Arduino

Wednesday, April 23rd, 2014

Ricardo of  Electropepper  writes about their latest project:  Now i want to show you my most recent project, an arduino shield aimed for prototyping, it has 8 LEDs, four buttons a buzzer and a temperature sensor, like everything else in my website its all open source, you can check the project...

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Use an LED as a sensor

Tuesday, February 4th, 2014

Michael Beyhs shows us how to use an LED as a sensor: How the code works: Configure all analog inputs to outputs and pull low to turn on all red LEDs. Turn one analog input pin into an actual Input and read the amount of light that is reflected into it....

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MEGA MINI assembly, part II

Monday, January 27th, 2014

Kevin Rye posted an update on his MEGA MINI project: This was just supposed to be a proof of concept for the GPS clock; basically a trial run. However, it could very well be a finished project on its own. I could just put it in an enclosure and it would...

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