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Aux power out - suicide?

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I am running a water cooled head on my UM, and I want to find a way of cutting the power to the pump once the print has stopped, for example if I run overnight.

Ideally I need a pin that can switch a MOSFET on the 12V line as an aux-out for the pump. It needs about 500mA so its more than could run from the existing fan outputs.

I know Daid did a suicide implementation a while ago which could do it by shutting the whole machine down, but I can't find this now, and I don't think it made it into the main Marlin build.

Any thoughts?




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The heater2 output is coupled to the heater2 temperature sensor.

If you set the heater2 to 100°C target temperature, but the temperature reading never reaches 100°C, then the output will always be switched on :)

Of course you need a firmware that enables the heater2 output. And you need to solder in some fixed resistors on the heater2 temperature input so that it will always read the same temperature.

-> When the print is done, target temperature will be set to 0°C so the heater will switch off. Make sure heater2 temperature doesn't read below zero degrees ;)


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