App note: Projection with LED light sources

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. An overview of LED projection […]

Replacement LED driver for AN6877

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 base LED drivers and it […]

Nifty USB LED light

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.

LED POV fan update

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 how I went about figuring […]

App note: Green LED replaces LDO regulator

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 a 1.8V LDO regulator in […]

App note: Chemical compatibility of LEDs

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 of LEDs during field operation. […]

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

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 and a fast growing community […]

Frequency counter with PIC16F628A

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 of outputs to do the […]

How to hack a manual control into a cheap DMX dimmer

This article shows how to hack a manual control into a cheap DMX dimmer by Miceuz and Rxdtxd of wemakethings; One of our friends wanted to have a manual-control LED dimmer for his stop motion setup. We had several of these cheap Chinese DMX dimmers. How does one adds potentiometer control to something like this? Just cut […]

blueShift – An OpenXC LED tachometer

In this video Pete Mills demonstrates his blueShift project, an OpenXC LED tachometer he is working on: An Arduino, some addressable LED’s, a bluetooth module, code and a 3D printer come together to make blueShift – An OpenXC LED Tachometer.  blueShift is so named for the Bluetooth protocol used for data communication, and the use of […]