Bed and/or hot end over temp signal

[ajlapp]

Is there currently a usable DIO or other physical signal that is trigger by a hot end or bend over temp?

I’m looking to add a secondary safety system to my printer that cuts main power if there is a thermal runaway.

I’d like to use the signals coming from the Duet as part of the system if they’re accessible.

[dc42]

In RepRapFirmware 3 you can do that, by defining a GPIO pin as a thermostatically-controlled fan, set to turn on if a defined temperature is exceeded.

However, IMO it would be safer to use an independent temperature sensor.

[ajlapp]

Thanks for the quick reply.

My thought was to bring in the Duet pin and a secondary pin and OR them into a master shutoff.

[ajlapp]

@dc42 <quote>defining a GPIO pin as a thermostatically-controlled fan</quote>

Any insight into how to define this? It's not clear to me. Thanks.

[ajlapp]

@ajlapp Looks like M42 is the correct direction