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Breadboarded 9 Volt Battery Charger

Posted November 23, 2014 by Chris

"9 Volt batteries extensively used in various electronics measurement equipment. Powering these devices with rechargeable batteries can be a cost effective solution. In this post a simple Lithium-ion 9 Volt Battery Charger design with overcharging protection will be presented. Charger is based on PIC16F876A microcontroller and uses its A/D module to monitor current flow into the battery."

Infrared IR Sensor Interface with PIC18F4550

Posted November 22, 2014 by Chris

"In this project, as promised before – we are going to demonstrate a PIC18F4550 microcontroller interface to IR sensor circuit….however you can do some more intelligent operations by adding some more logics to the microcontroller coding. Interfacing infrared Proximity sensors with Microcontroller is quiet easy."

Z80 Single Board Computer

Posted November 21, 2014 by Chris

"OK, it’s made on more one board, but you get the point. Based on Grant’s 7-chip Z80 computer, it uses his modified version of the NASCOM computer version of Microsoft BASIC running from an 8K ROM. The remainder of the Z80’s 64K address space is taken up with 56K of RAM."

The Open Steno Project

Posted November 20, 2014 by Chris

"Steno technology has existed for about a century, and has been compatible with computers for over 30 years, but until now the hardware and software necessary to write at 240 WPM has been restricted to professional stenographers. The Open Steno Project seeks to bring free software, low-cost hardware, and interactive learning tools to everyone who wants to use steno for their personal or professional pursuits."

Wireless BusCounter

Posted November 19, 2014 by Chris

"I’ve been working on creating a cheap, time-lapse camera that people could use to ‘sense’ the world around them. The cost of such a device would be around $10, when all is said and done, and having multiple of these devices would open up options for public computing that people have not considered – a world where people are willing to deploy “personal, public” electronics throughout their environment with the same ubiquity, recyclability and reusability as paper."

Prime-ary – Prime Number Generator

Posted November 18, 2014 by Chris

"For the last several weeks I’ve been hacking together a small prototype of a microcontroller (ATTiny2313)-powered prime number generator. I can finally say that it is complete, functional, and elegant. The name says what it does, so I won’t waste time describing it."

Infrared LED matrix

Posted November 17, 2014 by Chris

"We stripped out the insides of the device and mounted in our stackable led controller boards. These two boards are designed to convert random amount of LEDs to Arduino controlled matrix. There is high side controller – 8 P-channel mosfets per board. And low side controller uses TI TLC5940 16 channel led controller."

8-bit embedded TurkeyShield

Posted November 16, 2014 by Chris

"I’m always looking out for new ways to add more shields and components to my Arduino, and this felt like a natural experiment, so I gave it a shot: it’s an Arduino, Potentiometer, accelerometer, compass, Lithium Backpack, and TouchShield Stealth wired through a fairly large turkey :)"

LED Hand Turkey Sweater

Posted November 15, 2014 by Chris

"So I decided to give Thanksgiving the attention it deserves. As a kid, I loved making decorations for the Thanksgiving table. I thought whoever came up with the idea that your hand could be traced and transformed into a turkey was a genius…Which is how the idea struck me, and I embarked on my second e-textile project: a LED hand turkey sweater."

14×5 LED dot matrix scrolling message + source code

Posted November 14, 2014 by Chris

"The font is proportional, most characters are 4 pixels wide, some are 3 only, and a few are 5 pixels wide. The complete bitmap is precomputed, which requires a large RAM buffer."