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Looking for an app to generate a pulse
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Forum Regular
Join Date: Dec 2000
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Hello,
I am trying to setup a little control system for a set of Halloween haunted house events. In order to do that, I an looking for some software that can do these two things:
- Have a steady pulse be generated. This is something that would be able to trigger a relay that is somehow connected to the Mac (via USB ?). This would then start a fog machine. I need to be able to predetermine how long this pulse would be last.
- Have a second pulse generated but this one would be triggered by the intensity of an audio file. In other words, when the audio reaches a certain level, a pulse is generated. When it dips to a lower level, no pulse.
Would anyone know where I could find this?
Thank you very much for any help.
Bo
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Forum Regular
Join Date: Feb 2007
Location: Scappoose OR, USA
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I don't have a solution, but I am interested to see if somebody knows or comes up with one...
/me subscribes to thread
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Moderator  Join Date: Sep 2000
Location: Irvine, CA
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{{{ mindwaves }}}
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Senior User
Join Date: Jun 2002
Location: Albuquerque, NM
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There's also a box like this one. I've controlled this box via Apple Script using curl. You can give it simple http requests to turn the relays on and off. It also has 8 digital inputs so that could be your sound level trigger. The only problem is the IP Power box is slow, it takes almost a half second to control via http.
There is also another company that does some nice control boxes but I can't remember them off had. They always have an ad in Mac Tech magazine. They have all the Obj C APIs and sample xCode projects it you want to take a longer route. I'll try to remember to look it up when I get home and post the link.
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Senior User
Join Date: Jun 2002
Location: Albuquerque, NM
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Professional Poster
Join Date: Jan 2001
Location: Between Sydney and Melbourne
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This is cool stuff, please post the results in the lounge.
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Fresh-Faced Recruit
Join Date: Jan 2007
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wow, this sounds like an awesome project. Please fill us all in on the outcome. I'd love to see how it all comes together!
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Forum Regular
Join Date: Dec 2000
Status:
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Thanks very much for all the good suggestions. nerd, these are intriguing options to be sure.
One other option I amd currently looking at is to generate teh pulse manually in Garage band, based on a particular soundtrack and then output both to an 8 channel audio device. It seemed like an easy enough project at first but there is clearly no easy and/or cheap solution to it so far. I'll let you know what I come up with.
Bo
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