Wiring a return to home switch.

I want the mushroom switch I have to make my sim return to home, just drop the ffb and return to level. I looked up emergency stop in the forums and faq but all the info was for a complete power down. I already have a switch for my power supply, so I dont need that. I use a sabertooth 2x32 arduino combo so I have a few options.

The sabertooth can use 2 pins for an e stop. Not yet sure if I use both or just send one to ground. This safely removes power from the motors, a little better then pulling the plug. I believe this would just kill the motors though. There also seems to be something in the ard programming for e stop, this may be a better option.

I could use someone to point me in a good direction, I dont mind learning but this project already has my head spinning.

build thread: https://www.xsimulator.net/community/threads/started-first-2dof-today.10341/

What software are you using for the motor controller? I'm assuming you mean return to rest position. It should be really easy to add a "return to rest position" routine to an arduino firmware. Wire the button up like you normally would (with a pullup or pulldown resistor), and put the output of the button to one of the unused GPIO pins on the arduino. From there you'd do something like this (this is just pseudocode, not actual C):

Set up an external interrupt on the button pin:

attachInterrupt(digitalPinToInterrupt(interruptpin), returnToHomeISR, RISING)

void returnToHomeISR()
{
set Motor 1 position to Home
set Motor 2 position to Home
set Motor 3 position to Home
set eStopFlag to True
}

and then somewhere in your main program loop you'd put a check to see if the eStopFlag variable was set to true, and if it was, you'd break out of the motion loop and let the motors sit.