using PRI to trigger audio
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using PRI to trigger audio

by bpshaw on Tue Aug 28, 2012 2:38 pm

Hey All.
I work in museums and am looking at using a PRI (http://www.ladyada.net/learn/sensors/pir.html) to trigger an audio component of an upcoming exhibit. My curator has already sourced the audio controller (http://www.technovision.com/tecmp3.html) and I was wondering if there was anything else that I would need other than the PRI and the controller. Any help would be awesome.
Thanks.

Ben
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Re: using PRI to trigger audio

by adafruit_support_bill on Tue Aug 28, 2012 4:39 pm

The PIR sensor puts out a 3v ligic HIGH signal when motion is detected. Your controller inputs need to be pulled LOW to trigger a sound. In other words, you need a logic inverter. Scroll to the bottom of this page for an example inverter circuit.
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