Advanced Triggering
Even though the Sound Board is fairly simple and easy to use, you can do some cool stuff with it, if you're willing to get
creative
Trigger Order
What happens if you have more than one pin connected to ground/triggered? How does the Sound Board know what
to play? Great question!
There are 11 pins, #0 thru #10, the sound board looks at each pin, in order starting with #0 and if it sees that pin
connected to ground checks if it can find a Tnn file to play
That means, if you have pin #10 held down and then pin #0 held down, on the next loop #0 will always get played first,
then #10
You can use this quirk to create background effects and foreground effects
Basic foreground & background
For this example, we'll be using this set of WAV files that have some Darth Vader effects. Unzip and load these onto
your sound board
https://adafru.it/e9V
https://adafru.it/e9V
Ok now that you're done, you can see we have one file called T10HOLDL.WAV - this is a file that will play on loop as
long as pin #10 is held down. There's also a couple T00RANDx.WAV files, these are files that will be played in random
order when pin #0 is held down
Power the sound board and connect a wire from pin #10 to ground (not a switch!) you'll notice that the Darth Vader
breathing sound is now playing on loop. If you then have a button between pin #0 and ground and press it, a voice clip
will play on the next loop cycle (once the breathing has ended)
If you have a very short background sound loop, say one that loops evey 1-2 seconds, then this is probably good
enough. If you have a long loop like this one, where it takes 3 seconds to loop it can be annoying because you have to
wait until the sound is done to have the foreground noise.
Advanced Background/Foreground
The problem here is that you can't release the looping sound since its tied to ground. You could have one button held
down all the time or try a latching loop but it's a lot easier if you just use a switch that has NC (normally closed) and NO
(normally open) contacts - sometimes called a DPST (double pole single throw) switch
Most low cost switches and buttons do not have a normally-closed output, so make sure to check the specifications.
This switch is a good example of one with both, and it even has nice markings!
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