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In case anyone is wondering, this is the MP3 board that they used for the sound. If you take apart things with this ecto you really see that they were cutting corners and cheaping out. The MP3 player costs about $1, maybe less if bought in bulk. They took the time to solder on the wires for the speaker even though there are screw terminals for the speaker on it, and a 3.5mm jack, but couldn't be bothered to add wires to run it off the battery which would have taken the same time to solder a couple wires on. Runs on 3.7-5V so it easily would have run off the battery pack on the roof...or even add another one inside that box if power is a concern.
People should be complaining about the lack of effort that went into this at the last mile. They phoned in the electronics...the only good news is that it should be simple enough to put in an arduino or something and run at lease everything on the roof off that.
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Great post!