News of The Wolf

Random, hopefully interesting technical ramblings

Posts Tagged ‘circuit’

Twitter Popularity Meter – Hardware

Posted by chemicaloliver on 07/10/2009

The hardware for the system discussed in my previous post consists of an arduino, arduino ethernet shield, 2x 595 shift registers and one 8×8 common anode LED Matrix from china via ebay. Basically the arduino requests the page containing the current popularity metric and then adds it to an array containing the states of the currently lit LEDs which is then pumped out to the shift registers to update the display. The circuit lights the correct LEDs.

The circuit design is based on a design featured on the arduino playground for lighting 8 LEDs but was slight adapted to deal with the matrix.
schematic

I have also attempted to form this into a new arduino shield so I can reuse the LED matrix circuit quickly for other projects, a PCB is currently with BatchPCB

Posted in Electronics, Internet | Tagged: , , , , | Leave a Comment »

My First Synthesizer

Posted by chemicaloliver on 14/05/2009

Today I started the first stage in what may become online collaborative synth music performance system, I built a very basic synthesizer.

My design is based on one kindly posted on hackaday which I built on stripboard (very badly). It produces a simple square wave using a hex inverter IC and a capacitor and resistor, the hackaday article also details how to build in an LFO and other bits and pieces however I’ve saved for the next version which intend to package in a nice box al la amazing rolo.

I have often noted people having difficultly locating reasonably priced parts for this type of project online, all parts for this project were sourced in the UK from http://www.bitsbox.co.uk who I found to provide exemplary service for a very good price, especially if you order only a small number of items.

The next version will have more controls and in parallel to this I’ve just received an arduino, this will be used with a digital potentiometer to control the synth parameters in the first instance via a GUI probably written in java or processing and then eventually PHP.

Posted in Electronics, Synthesis | Tagged: , , , , , | Leave a Comment »