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Archive for the ‘LEDs’ Category

Driving a 48-segment RGB LED bar graph with a Teensy 3.2

Monday, July 24th, 2017

Glen Akins writes: In my post Driving a SparkFun 48-Segment RGB LED Bar Graph, I stated that the hardware built there could be used to drive the LED bar graph with any combination of hardware and software that could drive one of the common 32×32 or 32×16 RGB LED matrices....

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Creating custom 3D printed LED bar graphs

Thursday, May 11th, 2017

Glen Akins has a nice build log on his 3D printed LED bar graphs: While building my zombie containment unit, I decided I wanted some LED displays or bar graphs to complement the containment status video running on the smaller secondary video monitor. Some other containment units used LED air...

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Posted in 3D Model, LEDs | No Comments »

Programmable LED dimmer

Wednesday, May 10th, 2017

Programmable LED dimmer from Soldernerd: Around one and a half years ago I’ve designed and built various LED dimmers for both white and RGB LEDs. Then late last year someone approached me asking if I could make an RGB dimmer for him, too. But my designs were really tailored to...

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Posted in LEDs, programmers | No Comments »

Individually addressable incandescent lamps

Tuesday, April 18th, 2017

Michael wrote an article on controlling a bunch of lamps individually with WS2811 drivers and Arduino: I simply used the same technology as LED strips to allow communication between lamp modules. LED strips have RGB LEDs with an embedded driver chip which uses PWM (pulse width modulation) to control the...

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Posted in Arduino, LEDs | No Comments »

An Arduino Knight Rider Rainbow dice that uses WS2812B RGB LEDs

Thursday, March 2nd, 2017

An Arduino Knight Rider Rainbow dice built using a clock by Davide Gironi: This project implements a Knight Rider / Rainbow effect Random Selector. It uses an Arduino UNO and a WS2812B RGB led strip. A friend of mine needs a random selector for train scale model. I've developed this...

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Posted in Arduino, LEDs | No Comments »

Programming an 8 digit 7-segment display, the easy way, using a Max7219

Friday, February 17th, 2017

Allan Schwartz shows off the easy way to interface 7-segment displays using the MAX7219: Previously, in part 1 of my blog posting Programming a 7-segment Display, using just Arduino digital pins (the hard way) we had demonstrated how to hook up a pair of 7-segment displays to an Arduino, treating...

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Posted in how-to, Interface, LEDs | 5 Comments »

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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LED candle effect: Tear down and decap of a controller

Monday, December 12th, 2016

[embed]http://www.youtube.com/watch?v=ndXQex_spS8[/embed] A teardown video from Electronupdate: A dollar store item which implements a flickering candle effect using and LED. A look at the technology: linear feedback shift register or ROM based? Let's decap the controller and take a look at the silicon die to find out! More details at Electronupdate blog.

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Posted in LEDs, Teardowns | No Comments »

Serial seven segment LED display shield

Wednesday, December 7th, 2016

Raj over at Embedded Lab has just finished a new project article about a serial seven segment LED display shield: Seven segment LED displays are brighter, more attractive, and provide a far viewing distance as well as a wider viewing angle compared to LCD displays. This project describes a serial seven...

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Posted in Arduino, LEDs | No Comments »

Wifi enabled 8×64 pixel LED matrix display

Wednesday, September 21st, 2016

Raj over at Embedded Lab has just finished a new project article about Wifi-enabled LED matrix display using ESP8266: This project is a modification of my previous Bluetooth-enabled LED matrix display project, which used 8×64 monochromatic LED matrix (total 512 LEDs) for displaying scrolling text message. The original project used...

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Posted in LEDs, wireless | No Comments »

Experimenting with MAX6955

Thursday, September 15th, 2016

Florin wrote an article about experimenting with MAX6955: My experimenting actually started with MAX6954. After many failed tries due to SPI issues (Maxim uses a special interpretation of the protocol, I read), I switched to MAX6955. MAX6955 is the I2C sibling of MAX6954 (which uses SPI). They both have identical...

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Posted in LEDs | No Comments »

SNAFU box

Wednesday, June 29th, 2016

A SNAFU box project by Bertho of Vagrearg: SNAFU Box consists of 24 LED strips (12V passive type) of varying size, which are controlled by a set of 74HC595 shift-registers and a transistor driver for each strip and RGB channel. The LED strips are used to backlight the lettering of the...

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Posted in DIY, LEDs | 1 Comment »

Lab LED constant current controller board

Friday, December 18th, 2015

Ladvien blogged about his Lab LED constant current controller board project he made using DirtyBoard PCBs: A little lab controller PCB I'm working on. It centers around four high-power constant current circuits meant to be driven by an Atmega328's PWM. I hate working on anything mechanical in dim light; comes...

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Posted in DirtyPCBs.com, LEDs | 3 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 »

A connected lamp to wake me up

Friday, October 9th, 2015

Limpkin writes, "I've always wanted to play with these 10W RGB LEDs! So for some reason I bought 2 IKEA lamps at a flea market. As IKEA furniture has a long history of being hacker-friendly, I figured they shouldn't be an exception to the rule. My plan? Fit a few...

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Posted in LEDs | No Comments »

Cool room lights

Wednesday, September 30th, 2015

Dmitry Grinberg writes, "Lighting a room is always a complicated task. This is especially true if you're an engineer. You see, we all love blinking lights, RGB LEDs, really any combination of those things. When it came time to figure out the ligting situation for my room, I immediately knew...

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Posted in DIY, LEDs | 4 Comments »

ESP8266 LED display

Thursday, September 24th, 2015

Evan writes: This is my proof-of-concept for using mqtt with the esp8266.  I saw this LED display sitting around and I couldn’t imagine why no one was using it, the answer was no one knew how to talk to it.  Easy, I think.  Looking at the board it’s just an...

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Posted in LEDs, wireless | No Comments »

Fake TV security light

Monday, September 14th, 2015

Marcus Jenkins writes, "I made this gadget which steps up the game from leaving a light on at home when you're out. Place in near a window to make it look like somebody's at home watching TV. " Project details at Marcus Jenkins' site. Via the contact form.

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Posted in DIY, LEDs | 1 Comment »

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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DIY double sided 60W LED UV radiation unit with vacuum pump

Friday, June 26th, 2015

Kurt Skauen has been working on a DIY 1188 LED dual sided UV radiation unit: The UV exposure unit is controlled by an ATmega328P microcontroller and have the following features: Single and double sided exposure. Each side radiated by a 594LEDs / 30W UV LED panel (The unit has a...

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Posted in DIY, LEDs | 10 Comments »

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