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Registered Member #3908
Joined: Tue May 24 2011, 09:40PM
Location: Gilbert, Arizona USA
Posts: 68
The MIDI robot percussion instruments are finished and ready for the Halloween spectacular.
The MIDI instrument lineup is: Three octave Vibraphone, Twenty one tubular Cathedral Chimes, 2.5 octave Glockenspiel, Bass Drum, Snare Drum, floor Tom, Crash Cymbal, High Hat Cymbal, and of course the DRSSTC. Eric G has offered his two smaller DRSSTC's as an alternate to the big coil, since the big coil is far too loud, and would distract from the children's stage performance. That will ensure the public are watching the kid's show, and not just gawking in awe at the big coils.
It gets better! Eric will bring his big DRSSTC too, and run it alongside it's clone. We'll be running both big coils as the intermission entertainment, between the scheduled children's show segments. I've already added another 40A breaker and outlet to power his big DRSSTC.
So, the percussion instrument automation parts were built of junkyard items. A 120vac laundry solenoid provides the oomph to swing the bass drum mallet. The note output from the MIDI decoder is fed directly to an optically isolated, solid state relay (triac). The triac switches the 120vac line voltage to a surplus laundry solenoid, linked by a chain to the drum mallet.
A second decoder module is controlling five motor output transistors. Each transistor switches 12vdc provided by a power supply, to five different automotive door lock motors. In the high hat, two motors are arranged in parallel to provide additional force. The others are a Crash Cymbal, Snare (two separate motors), and a floor tom.
There was latency in each instrument because of the mechanism involved. It was compensated by advancing the note timing in the track of the music composition application.
I linked a youtube video of the instruments performing an intermission track daytime test of "This is Halloween".
Jeff
The five channel decoder and motor driver.
The single channel bass drum decoder/driver.
Polycarbonate mount for the solenoid was Eric's idea.
High Hat dual motor.
Drive mechanism for the snare. It performs an excellent fast roll.
Crash Cymbal motor view.
The final thread update will be of the actual Halloween performance.
Registered Member #3908
Joined: Tue May 24 2011, 09:40PM
Location: Gilbert, Arizona USA
Posts: 68
The 2012 Halloween Spectacular was a huge success! Fifteen hundred attendees, and without a mishap or any injuries. Eric and I were at the console for the three hours of the performance. Friends and family took the camcorder during that time to capture a few of the performances. Both Eric and I recorded some pre-event material to give you an idea of the equipment involved, along with the layout.
The first two are the pre-event videos.
Setup
Eric's *most excellent* pre event video
Showtime!
What is Love
Secrets
Funeral March of a Marionette
Eric's console side recording of Secrets
Hope you all like the videos. We had a blast putting on the event. The kids were rock stars at school on Thursday.
Registered Member #5258
Joined: Sun Jun 10 2012, 10:15PM
Location: Missouri - USA
Posts: 119
Awesome performance and beautiful build! A medium sized DR is defiantly on my to do list. My last TC was built before this site even existed. Lots of great examples to work from. GJ!
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Glad it'a all over it was fun but it was indeed a lot of work! Got to hand it to Jeff he spent most of the time organizing the event, I just provided some coils and manual labor.
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Another medium size DRSSTC build underway -now completed
