I saw how some moved a bell on a loco. and of course, I will do it another way. Usually they will use a piano wire moved by a servo mounted in the cab, too much for me. First one would have to transform rotary motion into reciprocating motion, not easy. I am using magnets. One on a small geared motor, an offset bell crank, and the other in the bell. It works. It changes rotary motion into reciprocating motion, because the bell can only reciprocate. Here are some videos.
Neat! I love those neo magnets. I keep a bunch of several sizes in my shop at all times. Many uses.
I was going to say I could not hear the bell, but you prevented that in the second half of the video. You could sync up the ringing sound with a microprocessor and a Hall effect sensor near the rotating magnets.
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