MendelMax Emergency Stop Button Mount
by BradDudenhoffer, published
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Or alternatively (and it's simplier) you can run the main AC supply through the emergency stop switch, this way you are sure than when it's pressed everything is shut off (including the PSU - sometimes the problem is the PSU itself :))
Another alternative, but less bullet-proof : if you're using an ATX power supply, you can run the "PS ON" wire through the switch, this way when you press it the PSU switches off.
It would probably be best to use the e-stop switch to trigger a relay. 12V 30A automotive relays are less the US$15.
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I have wired mine into the 12V line leading to my RAMPS board. If anything goes wrong just hit the button and all the motors and heaters shut down immediately.
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