[sdiy] Two new microcontroller projects (echo and MIDI sync)

Wooster Audio nathan at woosteraudio.com
Fri Jun 18 15:59:50 CEST 2010

Hi Stew,

Mostly it is just fun.  You can stick your hand between two devices to 
mute the rest of the chain or shift the rhythm.  You can pull one out of 
the middle and things keep going.  But you're right, its not entirely 
reliable.  I don't even know if it would work outside on a bright day 
due to light pollution from that rather close star.  In the future we 
might be moving to a modulated 38Khz clock signal which should work far 
better in those situations.  MIDI-IR is the first device to support that.

Some people have been hooking their devices up with cables.  MIDI-IR has 
a header with the clock signals on it.  I plan on sticking one in my 
MFOS sequencer.

I was mostly proposing these here as development boards for people to 
write their own software, with or without IR.  MIDI-IR has MIDI-in/out, 
two knobs connected to ADC's, a button, and pwm out.  Space Baby has two 
knobs, a rotary encoder, audio-in/out, in/out filters, and a crossfader.


On 6/18/2010 7:39 AM, Stewart Pye wrote:
> Maybe I'm alone here but to me  the MIDI-IR and  IR Sync seem 
> redundant. What's wrong with plugging a cable between devices? Going 
> by the webpage on IR Sync, any cable would be a hell of a lot less 
> hassle (and timing more reliable) than using the IR Sync protocol.
> It's not the 1st of April is it?
> Stew.
> Wooster Audio wrote:
>> I have two microcontroller-based projects for sale on my website.  I 
>> wasn't going to plug them here but they are both related to recent 
>> threads so why not. I think either board would make a useful platform 
>> for microcontroller synth experiments.
>> The first is Space Baby. It is a digital delay that can be 
>> beat-synced to an infrared clock. The delay time can be modulated 
>> with an internal LFO, and the input can be ring modulated with the 
>> delayed output for distortion effects. The kit uses the Microchip 
>> dsPIC33FJ64GP802 which is a 16-bit microntroller with DSP features 
>> (similar to the one Tom Wiltshire mentions in the "small 
>> microcontroller" thread).
>> The second is MIDI-IR. It takes a MIDI clock as an input and 
>> generates an infrared clock for syncing Space Baby, or other 
>> Andromeda Space Rocker kits. It can also act as a MIDI clock master. 
>> MIDI-IR normally outputs a 16th note clock, but has a button and knob 
>> for outputting other rhythms. MIDI-IR uses the PIC16F88 which is a 
>> 8-bit microcontroller.  Since it has both MIDI in and MIDI out it 
>> might not be hard to write some code to turn it into a MIDI buffer as 
>> described in the recent "MIDI too fast" thread.
>> There is a video of both in action on youtube: 
>> http://www.youtube.com/watch?v=qCax1eCkP8U
>> Schematics and other information is available on my website 
>> http://woosteraudio.com. When you buy either kit I can send you the 
>> source code if you want to make your own modifications. The tools to 
>> compile code for either are free on the Microchip website, and a 
>> PICKit programmer is only $35.
>> Nathan
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