The Sparkfun Sound Detector is a small and very easy to use audio sensor card with three different outputs. The Sound Detector not only offers an audio output, but also a binary display of the presence of sound and an analogueue display of its amplitude. The 3 outputs are simultaneously and independantly, so that you can use as many or as few as you want at once.
The envelope output allows you to easily read the amplitude of the sound by simply measuring the analogueue voltage. The gain can be set with a forward resistance to also change the threshold value of the binary (gate) output pin.
Each of the three output signals is present on the .1" pin-out at the edge of the board. They are active at the same time. If you do not use any in your particular application, simply leave this pin disconnected.
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