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This project will take your awesome Halloween costume to the next level!! Have a horse mask that can open/close its mouth!!
Cut two wooden dowels to 3.75" and another to 3" also find a circle piece of wood that is about 1.25" in diameter. If you don't have a circle piece feel free to just make 2x3.75" pieces. Make holes at both ends of one and if your using 2xdowels put a hole on one side too. Attach them to the servo as shown in the photos above.
Solder the servo to wires 5+, GND, and ~9. I'm using a regulated USB port so I connected the USB wires to 5+ and GND.
I Punctured Holes in the mask and used Black wire ties to hold it in place.
I made a custom code that randomly control's how wide the mouth is open at random times.
Plug it into a portable phone charger and wear it.