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Sensor stopping motor in a circuit

Sensor stopping motor in a circuit

Sensor stopping motor in a circuit

(OP)
Hi,
I'm doing a project where a seat moves along a thread that rotates via a motor. I'm trying to think up a way where I can control the motor without programming or Arduino. My idea at the moment is to have a Double Pole Double Throw (DPDT) switch, that allows the motor to move clockwise and anti-clockwise, in a simple circuit hooked to a power source and the motor. But, I also want a sensor on either end of the thread so that once it reaches the end it stops the motor. I'm really stuck on how to incorporate this into the circuit and was hoping if people had any ideas on this situation? Would this be the best course of action for me without doing any programming?

Thank you for reading this post. A picture of the first part of the circuit should be attached below.

RE: Sensor stopping motor in a circuit

(OP)
Thank you so much. Now that I think about it if the seat is at one end I would have to deactivate that switch on that end and have to activate the switch on the other end if I want the seat to move from end to end and get it to stop.
(Don’t know if you get the full picture)

But it’s okay I’ll have to alter your circuit a bit, thank you again😁.

RE: Sensor stopping motor in a circuit

You set it up so the limit switch on an end stops it from going further and mechanically crashing at the end but leaves the setup so you can electrically back away from that end heading back to the other end.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Sensor stopping motor in a circuit

(OP)
Yeah that’s exactly how I want it to play out. Thanks for the assistance😁

RE: Sensor stopping motor in a circuit

DPDT switches can be toggle or momentary contact and they can have a center-off position or not.
For a seat position control, you want a momentary contact DPDT with a center-off. This is usually a rocker type of switch, where you press one side of the switch or the other to move the direction that you want. When you stop pressing the switch the motor stops.

The limit switches are still required. The way that Keith drew the limit switches will stop the motor from going past the limit, but does not cause the motor to reverse automatically. It also allows the motor to start again in the reverse direction.

RE: Sensor stopping motor in a circuit

(OP)
I see. I didn’t know that about the DPDT switches but wanted those exact properties you stated so thank you for your help😁

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