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19 Jul 2014

by TheSignalPathBlog:

In this episode Shahriar takes a close look at programming the popular NeoPixel RGB LEDs using a PIC microcontroller and C-language. A close-up of the NeoPixel (WS2812) LED is shown with attention to identifying various semiconductor elements inside the package. The principle operation of the LED is the described along with a detailed explanation of the pins and the one-wire communication protocol.

A simple evaluation board for the PIC18F4550 is used to drive a circular array of 60 NeoPixel LEDs from Adafruit. After presenting the difficulties of providing an accurate pulse-shape using the C-language, the measured waveform is shown on a Tektronix MDO4000B. Finally, the code for a circular color rotating pattern is presented and demoed. The code for the experiment can be downloaded from The Signal Path website.

Tutorial on Programming the NeoPixel (WS2812) RGB LEDs - [Link]

10 Apr 2014


xlisus @ instructables.com writes:

Choose the hue of light that makes you feel more comfortable.

Simple bluetooth remote control from which you can modify lighting from your mobile device or tablet.
- You have two separate RGB channels where you can get different colors per channel.
- Control adjustable intensity.
- Do it yourself .
- Thanks to the arduino platform in minutes you ‘ll Omniblug armed and ready for use.

Discover all the features provided. Is very easy install this small device.

Android Bluetooth Control Led RGB - [Link]

30 Mar 2014


ZXLee built a simple sensor for Arduino which allows him to detect colors. The idea lies behind using red, green, blue LEDs and Light Dependent Resistor (LDR). Lee Zhi Xian writes:

Previously I have made a colour sensor using Arduino but don’t have the time to update it on my blog. Today I am going to share the details of this mini project. Basically, the sensor consists of three LEDs and Light Dependent Resistor (LDR). The LDR will detect the colour and display it to another RGB LED. Besides display it on the RGB LED, the colour will also display on PC. RGB LED is commonly used in display colours on LCD or OLED such as the monitor and television.


Simple technique of sensing colors using Arduino - [Link]

23 Mar 2014


LANp combines an LED RGB Bar from an old scanner, an Arduino and Ethernet/SD Shield to make a full RGB Lamp.

It has a built-in webserver that has an RGB colour picker, which changes the LED bar in real-time.

There is some photos and a YouTube video to show it all working.

LANp – A DIY Arduino network controllable RGB lamp made from scanner parts! - [Link]

15 Mar 2014


Frank Zhao shared his simple 6x USB charger with current monitor in the dangerousprototypes.com project log forum:

This is a simple 6 port USB device charger with a individual current monitor on each port. The charging current is indicated using RGB LEDs. Blue means slow charge (under 250mA), green means 250mA to 750mA, red means over 750mA, and purple means over 1500mA (for tablets). This circuit involves an ATmega328P (if you do hobby electronics, I bet you have plenty spares of these), INA169 (check out this breakout board), and a OKR-T10-W12.

Simple 6x USB charger with current monitor - [Link]

20 Feb 2014


There is a new 8mm RGB LED introduced to the WS2812 family of LEDs. cpldcpu writes:

There is a new addition to the popular WS2812 family of RGB LEDs with integrated controller: A 8mm through hole version. Right now they seem to be in pilot production stage. The only place that has them is Soldering Sunday where they are called PixelBits. My understanding is that they will also be available at the usual sources later this year. I got a couple of them to test for compatibility with my light_ws2812 library.

New member of the WS2812 RGB LED family - [Link]

19 Jan 2014


Greeeg at the 430h forum has been working on a RGB LED ring clock:

The clock is comprised of 2 rings of 60 LEDs each. the LEDs are WS2812 parts, which include a built-in driver. The PCB is one of the interesting parts of this clock. I designed the board in altium as a single 6 LED segment. and then left pads at each end to allow them to be soldered onto another segment. Currently I am using a MSP-EXP430FR5739 board to drive it, using some very in-efficient assembly code that requires a 20MHz clock.


RGB LED ring clock - [Link]

29 Dec 2013


The PicoBuck is a small and inexpensive 3-channel LED driver. It employs constant-current buck driving which approaches an efficiency of 95% (theoretical). It’s based on AL8805 LED Lighting Buck Driver from Diodes Inc.

PicoBuck – RGB LED Driver - [Link]

14 Dec 2013


Zak Kemble writes:

While working on an update for my CPU Usage LEDs project, I thought why not just make it into a universal RGB LED controller? The CPU Usage LEDs controller took a value between 0 and 255, worked out what colour it should be and then fade to that colour. This was very limiting; changing what colours it used and how it fades required a firmware update. With this universal RGB LED controller the host software does all the work and the controller is simply told what brightness the red, green and blue LEDs should be. To make it as easy as possible to interface with the controller I created a library which deals with all the LibUSB stuff.


AVR USB RGB LED controller - [Link]

21 Nov 2013


BO.Duino is an Arduino compatible board based on ATmega328 ATMEL’s mcu. This board features many peripherals usually externally connected on a breadboard or prototyping board such as sensors, SD card etc. Peripherals included are:

- A real-time clock
- AT24 series external memory chip
- MicroSD card adaptor (SPI)
- A potentiometer on analog input
- Connector for DS18b20 or DHt11 series sensors

BO.Duino – ATmega328 Arduino Compatible board - [Link]





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