Swinging?Are you maintaining the swing of a pendulum?If so don't forget that a pendulum will have a resonant frequency dependent upon it's length.Replace the LED with an LED opto-coupler on either the Arduino or the circuit below.How many wires does your printer motor have?
you need a H bridge that control by an opto couple then this could be usebtw the third leg is it connected to anything body or something
I'll preface this with the disclaimer that I hate when people suggest changing my design instead of answering directly, but in the case of a bell, have you considered a mechanical oscillation method? Then you only need to move the motor in a single direction. Very, very simple.An oscillation could be provided by a cam or a crank.
Yeah, but in this case it would be easier for me to make the motor do all the work, I dont have the necessary tools to make a mechanical solution, while I can quickly order some electrical components and solder up a electronical solution.
Fair enough and I can understand. Realize that you will need to overcome momentum to reverse the motors. Technically, for a bell, all you need to do is drive in one direction, then let go. The bell will swing back by its own weight and up in the other direction. So, all you need really is to kickstart it in one direction and keep it moving.Similar to a church bell, you could just affix a lever and a motor on a pulley. You drive the pulley in one direction, the bell lifts. Then let go of the motor at its highest point and the weight spins in it in the other direction. Sense when it is at its lowest point and kick the motor again. Instead of sensing anything, you can just use timing.If you really want to go with the astable multivibrator approach, why not just get rid of the micro altogether and use a 555 timer to directly control the motor?My last suggestion.
I do suspect that constant torque on the bell axle may dampen the ringing. A bell sounds its best when it swings loosely.Well, you mention that you don't have the ability to make a mechanism, so how to you currently plan to actuate the bells with your motors?