I recently 3dprinted a train whistle that usually works with a mouthpiece. It works by simply blowing air in it.
However, I would like to convert it to a whistle for my bike.
For that I would need a system that could blow air in it, instead of myself, with the press of a button.
Any idea on what i could start with to build that ? It would be best if the circuitry was quite compact too.