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rrolison
PostPosted: Apr 13, 2010 - 10:52 PM
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Joined: May 02, 2005
Posts: 33
Location: Northeast Pennsylvania

I designed a MIDI synthesizer for the Atmega162. It's the controller I use to drive my DRSSTC, which is a cool type of solid state coil.

I am grateful for the PDF found here @ AvrFreaks that describes a bit about designing a MIDI controller.

My latest test was real entertainment for me. Here's the short clip. I like to think of it as an electric guitar. Wink http://www.youtube.com/watch?v=k_KymmnrOQ4

Rich
 
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tlucas
PostPosted: Apr 13, 2010 - 11:48 PM
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Joined: Jan 23, 2010
Posts: 840
Location: Edmonton, Alberta

That's pretty cool!
 
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donblake
PostPosted: Apr 14, 2010 - 06:42 PM
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Joined: Jan 03, 2004
Posts: 1675
Location: Apalachin, NY, USA

Very nice!

Don
 
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rrolison
PostPosted: Jun 12, 2010 - 06:59 PM
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Joined: May 02, 2005
Posts: 33
Location: Northeast Pennsylvania

Long live the Atmega162. Here's another recent release:

http://www.youtube.com/watch?v=wSVW1Ehl7EA

Rich
 
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Someguy22
PostPosted: Jun 13, 2010 - 12:14 AM
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I'll go for the pun: "Electric Avenue" by Eddie Grant. Electric Avenue is a street in London. There are several others around the world.
 
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Simonetta
PostPosted: Jun 13, 2010 - 01:38 AM
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Joined: Mar 12, 2003
Posts: 1065
Location: Portland, Oregon USA

I hope that the MIDI code that I've left here might be of some use or interest.

I'm interested in making a super-cheap MIDI controller using 16-cent infraRed diodes and detectors. The web site that describes it is here: www.artemlive.com/cgi-bin/news?c=v&id=758

It used to be here in the projects section but I couldn't find it today.

This combination of diodes and an op-amp gives an ADC-readable voltage according to how far the hand is from the LEDs. This voltage can go into an AVR ADC and the digital result be sent to the synth as continous-controller filter-cutoff-frequency, pitch bend messages, effects delay-length, attack rate, or even just volume. All hand-controlled like a Theremin.
 
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bobgardner
PostPosted: Jun 13, 2010 - 02:21 AM
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Joined: Sep 04, 2002
Posts: 23486
Location: Orlando Florida

So how does that zapper make sound? You emit zaps of various durations like pwm? Any way of controlling the volume? How many volts to get a zap? 30KV?

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rrolison
PostPosted: Jun 13, 2010 - 02:53 AM
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Joined: May 02, 2005
Posts: 33
Location: Northeast Pennsylvania

Yeah I suppose in layman terms it's bursts per second to produce tones. PWM, yes. I'm using a pair of 16 bit timers and both compare units, plus 1 bit timer with 1 compare unit to produce up to 4 note polyphonic.

Only way to reduce volume is to decrease arc length. That's takes all the fun out of it.

I can't quite calculate the voltage. Someone more qualified would have to answer that.

This is known as a Dual Resonant Solid State Tesla Coil. My midi synthesizer merely sends burts of PWM to the enable line on the coil.

I use the 6N138 to interface the MIDI line.
 
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rrolison
PostPosted: May 10, 2011 - 10:19 AM
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Joined: May 02, 2005
Posts: 33
Location: Northeast Pennsylvania

It's been a while since my last post here. I'll post one more link to a video of my system in action. It has some slight improvements since the last release. I'll soon be starting another MIDI controller design, so, this one may become obsolete...

http://www.youtube.com/watch?v=dHI4E9d0U7I

Rich
 
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krishnabalan
PostPosted: May 10, 2011 - 10:47 AM
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Joined: Sep 08, 2010
Posts: 259
Location: India

Cool Stuff !
 
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bobgardner
PostPosted: May 10, 2011 - 11:19 AM
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Joined: Sep 04, 2002
Posts: 23486
Location: Orlando Florida

So I want to use it up at the local blues bar with my guitar. Any COTS pitch extractor to midi boxes for guitar around? If I set it up too close to the bass player does his hair stand up on end?

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rrolison
PostPosted: May 27, 2011 - 05:19 PM
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Joined: May 02, 2005
Posts: 33
Location: Northeast Pennsylvania

A Roland VG99 and a particular pickup is all that is required to interface with this system.

Peoples hair will stand up due to static electricity. This system produces high frequency AC, not static electricity.

Speaking of blues, here's something I did along those lines : http://www.youtube.com/watch?v=H1K7Mc73YiM

Rich
 
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