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ATX power off?

Traveltrousers

ATX power off?
November 07, 2013 09:28AM

Registered: 10 years ago
Posts: 94

Does anyone know if it's possible to use the M81 command at the end of the print?

I read it's possible with RAMPS boards by connecting the green ATX wire to a point on the board.

Is there any datasheet for the Melzi board and it's mysterious JP16/17 connectors?

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IntelliTom

Re: ATX power off?
November 07, 2013 04:00PM

Registered: 10 years ago
Posts: 46

I would be interested in this. It would be great to be able to turn off the machine completely at the end of the print. I often leave it running at night or when at work. The other things I was thinking was to hook up a relay through an Arduino or RPi, but your method seems much simpler! winking smiley

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nophead

Re: ATX power off?
November 07, 2013 06:31PM

Admin
Registered: 17 years ago
Posts: 7,879

The schematic for the Melzi is on the Reprap Wiki.

You would need to power the Melzi from USB, which is never a good idea as USB 5V is not very accurate or stable.

[www.hydraraptor.blogspot.com]

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nophead

Re: ATX power off?
November 07, 2013 07:15PM

Admin
Registered: 17 years ago
Posts: 7,879

Or a little latching circuit could be made to turn it on with a button and off with a pulse from the Melzi, which would then commit suicide by turning its own power off. It would probably need a couple of transistors.