Reversing polarity through signal from mouse switch

You will need more gear than you presently have there.
Is it important which way it travels to begin with...??
Latching will be required with each micro switch operating as a limit for a particular direction.
Then the motor needs to stop (perhaps only momentarily) before continuing on in the opposite direction.
What will be the initial start and eventual stop be comprised of.

Most of the above can be done with relays or solid state switches like mosfets etc. possibly h-bridge unit or even a small microcontroller if you are that way inclined.

Is any form of speed control required or were you planning to simply apply less voltage ..?

 

What are the voltage/current/rpm ratings of the mechanism ?
How long does it take to travel the 180° ?

 

What you have are essential pieces, but not everything that is needed. The two switches control whatever is doing the actual voltage reversal. One way or another, the basic method is a toggle function and a DPDT power switch function. These can be done with all relays, all electronic components, or a combination of the two. What is your skill set for assembling a circuit or wiring relays?

ak

 

Any details on those micro switches...cannot see from the photo.
Do they have changeover contacts or are they either normally open or normally closed..?

 

From the mechanism details you have given, I don't think there's any risk of inertia causing the mechanism to come up hard against an end stop before it has had a chance to be reversed, and at 30mA current the motor is unlikely to be harmed by a sudden reversal. That simplifies things considerably. So a latching change-over switch (solid state or relays) triggered by the micro-switches will do the job.

 

They are SPST (NO) or SPDT limit switches.

ak

 

Here's one way you could do it, using a dual-coil DPDT latching relay controlled by the normally-open contacts of the limit switches :-

The resistors and capacitors are for suppressing any arcing at the switch contacts.
Resistors are 1/4W. Caps are film type. If the motor running current is 30mA the relay switch contacts should be rated to switch DC of at least 100mA.

 

Here is a circuit from another question last December. For your use, the two switches (NO contacts) are wired in parallel in the place marked SW1. When either switch closes, the circuit reverses.

The circuit is based on an impulse relay that performs the toggle and latch functions. This link is to a fairly beefy unit that probably draws more power than the motor, although it is energized for very brief periods. It is included here as an example, not a recommendation of a specific part.

https://media.digikey.com/pdf/Data Sheets/Tyco Electronics P B PDFs/S89 90_DS.pdf

ak

 

No.
a1 = 14,
a2 = 24,
b2 = 22.
The switch gets wired 'diagonally' for reversing; i.e. 12 connects to 24, 14 connects to 22.
The 'i' in my diagram is actually a + sign partly hidden.
The A1 coil is the 'reset' one to bring the contacts to the state shown in the datasheet.
Your chosen relay is a tad OTT for this project. Note that each coil draws 0.5A briefly.

 

If you ignore the switches completely, any oscillator should work here as well, if you get it the right frequency, but you probably could involve the switches with the oscillator as well to make it not go out of synch.

 

Huh?