randomly select 1 of 5 DC Micro Motor 3V

Hi 50 years ago I built electronic kits and I find myself with a need for a simple project.

The concept is about sensory motor retraining of my hand to overcome a condition known as task specific focal dystonia, something that impacts musicians who have spent many years of intensive practice. This would be one small tool in a planned recovery

With a set of 5 3v DC Micro Motor, the circuits need to randomly activate one motor for 1-2 seconds. The motors will be placed in a pattern that matched the shape of a hand, one motor for each finger

At this point I have 3 of the aforementioned cell phone vibration motors ( 10mm x 2.7 mm ) coming this week and I own a soldering iron. Once I feel I can build this, I'll look for additional motors.

I apologize if this is not the type of question allowed to be posted here and for any lack of needed information

Thnnk you very much

by HSCIII
November 18, 2018

What an interesting project! An easy way to address it would be to run a fast counter and then stop it. The counter state at stop would address one and one only motor. Stop here for 1-2 seconds, then repeat.

For example you might use a CD4017 counter, this if you stop the clock will have just one output. The run/stop clock could be 555 based and the fast clock another 555. Some logic would be needed to inhibit operation during the run time, and to prevent stops in unused states.

I hope I have read your needs right,please let me know.

by mikerogerswsm
November 18, 2018

Looking at typical motors they need 100-200mA so you will need to buffer each CD4017 output with an NPN emitter follower or similar.

by mikerogerswsm
November 20, 2018
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