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Real-time Arduino Spectrum Analyzer (8-bit FFT)

Posted September 30, 2014 by Chris

"A real-time Spectrum Analyzer, with due credit to ‘deif’ on the Arduino forum for making Tom Roberts’ simple 8-bit FFT implementation available. On the above display you can see a typical ‘power spectrum’, with one dominant frequency plus harmonics at fixed intervals."

Picture-Axe, Sound trigger to camera flash

Posted September 29, 2014 by Chris

"Sound seemed to be the logical choice, and google led me to some basic circuits for triggering flashes with sound, but I wanted to be able to control the delay and sensitivity and have different modes and functions. Thanks to LMR I new the solution. Microcontroller! So I started boarding and building."

Physical tone matrix

Posted September 28, 2014 by Chris

"Inspired by Andre’ Michelle’s Tone Matrix flash applet I decided to make a physical version – i.e. a box with buttons, flashing lights and knobs to turn. I wanted 16×16 – the Bliptronic 5000 just doesn’t have enough lights."

Waveform Generation using AVR Microcontroller

Posted September 26, 2014 by Chris

"At times we come across applications or situations wherein we need to generate square waves with the microcontroller. The square wave can be generated by programming a pin which toggles between 0 and 1 with a certain time delay. Alternatively, the inbuilt feature of AVR timers can be used in square wave generation."

Chippu – A Robot to run ROS

Posted September 24, 2014 by Chris

"Lately I was busy in the hardware design of a personal robot named Chippu. It is an open source project and runs ROS, the same powerful code framework that runs on many robots like PR2. It is made as economical as possible. At present there is no on-board processing and it is done in a remote computer."

A Theremin Design Walkthrough

Posted September 23, 2014 by Chris

"This document will detail my attempt at designing and building a complete theremin…..The project should be a valuable educational experience for anyone undertaking basic RF electronics."

Control Your Robot With Node.js – Raspberry PI and Arduino

Posted September 22, 2014 by Chris

"Advancements in Javascript, node.js, have simplified communication between robot and user. Using two choice nodejs libraries, socket.io and johnny-five, you can quickly put together a system to control a robot using a web browser."

Motorised Time-lapse Rail with Raspberry Pi

Posted September 21, 2014 by Chris

"There’s another article in the series of photography related DIY projects using the Raspberry Pi single board computer…With all the talk about time lapse rails, I though I’d have a go at building one."

BBC Micro on FPGA

Posted September 19, 2014 by Chris

"The project was, like the Spectrum, implemented on a Terasic DE1 board with an Altera Cyclone II FPGA. The entire design is written in VHDL, and it fits in 2907 logic elements when compiled on Quartus 9.1. This is about 16% of the capacity of the EP2C20. A small amount of on-chip memory is used for the teletext character generator ROM, with the program ROMs residing in off-chip flash."

Meet Robin: The CAPS-LOCK indicating robotic helper

Posted September 18, 2014 by Chris

"Are you struggling to see if your caps-lock is enabled? Typing in incorrect passwords, because of this? Robin can be of assistance. He will also warn you if you are toggling caps-lock to quickly."