This is just for fun, nothing serious :-)
MP3 Bike horn based on cheap MP3 Player board and few additional components. Powered by 3 AAA batteries.
MP3 Player board like this:
https://www.ebay.com/itm/TF-Card-U-Disk-Mini-MP3-Player-Decoder-Audio-Voice-Module-for-Arduino-DFPlayer/172068842193
It uses reentrant horn that can parametrized for a different size:
https://www.thingiverse.com/thing:3133987
Schematic and Eagle files included - if anybody is interested.
It can play 4 melodies (mp3 files) stored at SD Card.
Video: https://youtu.be/NGRnqf-xwgw
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