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Does the WS2812 have integrated Gamma-Correction?

From cpldcpu.wordpress.com 2 days ago in Blogs

A while ago, I used transient current analysis to understand the behavior of the WS2812 a bit better (and to play around with my new oscilloscope). One peculiar finding was that the resolution of the pulse-width modulation engine was actually...

Analyzing a Copper String Light with unusual Phosphor Converted LEDs

From cpldcpu.wordpress.com 7 months ago in Blogs

After being amazed about finding a really clever implementation of powerline controlled LEDs in a low cost RGB “copper string light”, I bought a few other products in hope to find more LEDs with integrated ICs. At less than $4.00...

Controlling RGB LEDs with only the Powerlines: Anatomy of a Christmas Light String

From cpldcpu.wordpress.com 7 months ago in Blogs

As should be obvious from this blog, I am somewhat drawn to clever and minimalistic implementations of consumer electronics. Sometimes quite a bit of ingeniosity is going into making something “cheap”. The festive season is a boon to that, as...

The TransistorPixel

From cpldcpu.wordpress.com 1 year ago in Blogs

What would it take to build an addressable LED like the WS2812 (aka Neopixel) using only discrete transistors? Time for a small “1960 style logic meets modern application” technology fusion project. The Objective What exactly do we want to build?...

Ultra Low Power LED Flasher using the Padauk PFS154

From cpldcpu.wordpress.com 2 years ago in Blogs

Flashing a LED is certainly among the first set of problems any burgeoning electronics specialist is tackling, may it be by using an ancient NE555 or, more recently, a microcontroller to control the LED. As it turns out, we can...

Power Analysis: Probing WS2812 RGB LEDs

From cpldcpu.wordpress.com 2 years ago in Blogs

Power analysis is a technique to probe the inner workings of an integrated circuit by measuring changes in the supply current. Whenever a logic gate switches, it will cause a tiny current spike that can be measured externally. By inspecting...

Building a Chaotic Oscillator from Common Components

From cpldcpu.wordpress.com 2 years ago in Blogs

Sometimes you find things you have not even been looking for… A chaotic oscillator is an electronic circuit that can exhibit “chaotic“, nonperiodic behavior. A commonly cited example is Chua’s circuit, but there are many others. I always regarded these...

Intelligent 7-Segment Display

From cpldcpu.wordpress.com 2 years ago in Blogs

Time for another project with a super-low-cost microcontroller. But what to design? Ever since seeing a project where a $0.03 MCU controls $40 worth of intelligent RGB LEDs, I have been wondering whether this is the right place to use...

What made the 1960s CDC6600 supercomputer fast?

From cpldcpu.wordpress.com 3 years ago in Blogs

Anybody who has ever taken an advanced computer architecture class has heard of the CDC6600, which was the world’s fastest computer from 1964 to 1969. It was the machine that put Seymour Cray on the map as a supercomputer architect....

A LED-Candle based on the 3 cent MCU

From cpldcpu.wordpress.com 3 years ago in Blogs

After having reviewed sub $0.10 microcontrollers recently, it’s time for some projects using the Padauk PFS154 and PMS150C. Considering my previous investigation of electronic and non-electronic candles, it appears only natural to chose this as a target for the lowest...

The “terrible” 3 cent MCU – a short survey of sub $0.10 microcontrollers.

From cpldcpu.wordpress.com 3 years ago in Blogs

Like many others, I was quite amazed to learn about a microcontroller sold for only 0.03 USD via the EEVblog last year. How was this possible? Many assumed this was a fire sale of an old product. Digging a bit...

SK9822 – a clone of the APA102?

From cpldcpu.wordpress.com 6 years ago in Blogs

Two years ago I took a deeper look into the APA102. Although it was more expensive than the common WS2812, and harder to come by, it had some intriguing properties. The main benefits are a timing-insensitive  SPI interface, allowing easy...

DICE10 – electronic dice controlled by two GPIO.

From cpldcpu.wordpress.com 6 years ago in Blogs

Yay,  another mini-project with the ATtiny10! A while ago I devised a scheme to drive an electronic dice with only two IO lines. I finally found the time and motivation to build up a small design using this as an...

DICE10 – electronic dice controlled by two GPIO.

From cpldcpu.wordpress.com 6 years ago in Blogs

Yay,  another mini-project with the ATtiny10! A while ago I devised a scheme to drive an electronic dice with only two IO lines. I finally found the time and motivation to build up a small design using this as an...

Gluon – developing a bootloader for the ATtiny104

From cpldcpu.wordpress.com 6 years ago in Blogs

The ATtiny102 and ATtiny104 are Atmels newest addition to the AVR ATtiny family. They are a bit different to most of the other devices in that family, since they are based on the AVRTINY CPU core, which was so far...

Gluon – developing a bootloader for the ATtiny104

From cpldcpu.wordpress.com 6 years ago in Blogs

The ATtiny102 and ATtiny104 are Atmels newest addition to the AVR ATtiny family. They are a bit different to most of the other devices in that family, since they are based on the AVRTINY CPU core, which was so far...

The SK6812 – another intelligent RGB LED

From cpldcpu.wordpress.com 6 years ago in Blogs

During the last months, a new WS2812 alternative appeared on the market: The SK6812. I finally managed to get my hands on some of them to take a closer look. In most aspects these devices are basically clones of the...

The SK6812 – another intelligent RGB LED

From cpldcpu.wordpress.com 6 years ago in Blogs

During the last months, a new WS2812 alternative appeared on the market: The SK6812. I finally managed to get my hands on some of them to take a closer look. In most aspects these devices are basically clones of the...

“Reverse engineering” a real candle

From cpldcpu.wordpress.com 7 years ago in Blogs

Two years ago, I spent some time analyzing the algorithm used in a candle flicker LED as  commonly found in cheap artificial candles. I reverse engineered the  algorithm from the flickering pattern and recreated the algorithm in software. Turns out...

“Reverse engineering” a real candle

From cpldcpu.wordpress.com 7 years ago in Blogs

Two years ago, I spent some time analyzing the algorithm used in a candle flicker LED as  commonly found in cheap artificial candles. I reverse engineered the  algorithm from the flickering pattern and recreated the algorithm in software. Turns out...

How many I/Os are needed to drive electronic dice?

From cpldcpu.wordpress.com 7 years ago in Blogs

I recently bought a very low cost electronic dice kit on an impulse. Assembling it was good retro-fun for a while. The circuit design is was purely 70ies style: A CD4017, a NE555 and a couple of transistors. Of course,...

Understanding the APA102 “Superled”

From cpldcpu.wordpress.com 8 years ago in Blogs

A couple of weeks ago I reported about a new type of RGB-LED with integrated controller, the APA102. One of the interesting new features of this device is a two-wire SPI interface instead of the proprietary one-wire protocol of the...

Measuring the length of a WS2812 string

From cpldcpu.wordpress.com 8 years ago in Blogs

Recently, I encountered an interesting problem: How do you measure the length of a WS2812 programmable RGB-LED string electronically? That is, just using signals that are already there. This can be useful if you want a LED controller to adapt...

APA102 aka “Superled”

From cpldcpu.wordpress.com 8 years ago in Blogs

After clones and variations of the venerable WS2812, there finally seems to be a new RGB-LED with integrated controller that actually improves on several characteristics: The APA102, also known as “Superled”. There are two versions on the market, the APA102...

Timing of WS2812 clones – PD9823

From cpldcpu.wordpress.com 8 years ago in Blogs

The WS2812 RGB LEDs with integrated controller are fairly successful devices that come in a variety of packages. Recently, similar devices by other manufacturers started to appear. I managed to get my hands on a few samples of LEDs with...

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