I'm rigging up a Halloween costume and have a few questions I need answered before I can finish it up. Specifically, I'm building a voice changer using my Arduino Uno and a Wave Shield from AdaFruit. Here's the link that shows how to wire it all up: Building It | Wave Shield Voice Changer | Adafruit Learning System
So here's my questions:
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I don't want to use a potentiometer to change the voice pitch (like in the downloaded sketch). I just need a deep evil sounding pitch and I'm hoping I can just hardcode that into the code instead of wiring up more components. I downloaded the sketch from the link above, but I'm afraid I don't really know enough about what's going on to know how to hardcode a voice pitch value. Can someone give me an idea of how to go about doing this? And perhaps a recommendation on what value to use, or a valid range of vales that I can try out?
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The instructions say to use a 9v battery or a 6xAA setup (which will last significantly longer). I'm assuming the difference in voltage between those 2 options is mitigated by the Uno's onboard voltage transformer, so I don't need to alter anything in my wiring to accommodate for this, correct? If that's the case, I'll go with the 6xAA setup. My question is, can I simply wire in a "kill switch" along the positive wire leading to the Uno, to simply turn the whole unit on/off? I'm thinking I can, just want to be sure I'm not overlooking anything important.
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In the link above, does anyone know what the brand of speaker is being used? I'm referring to the silver one that looks store bought in the one pic. I don't want to have to wire up the amp breakout and a bare speaker, so I'm thinking that getting an mp3 speaker with a 3.5mm plug is perfect. Only issue is I need a way to wear or mount the speaker so I need a flat or low profile speaker like that one pictured. Any thoughts on what it is, or if there are others out there like it I can get?