Config for bed heater w/ multiple sensors
-
Ive finally gotten around to installing the mains powered bed heater I ordered a couple months ago. Wiring is done now time for config file setup.
The heater has a thermistor built into into but I also drilled a small hole halfway into the 9mm build plate and inserted another thermistor coated in boron nitride thermal paste. My understanding is the bed heater temp may not accurateky reflect the build plate temp.
I want to use the thermistor inserted into the build plate for the bed temp and the one that is within the bed heater as an emergency off if it exceeds a set value.
What would be the best way to implement this?
Running on 6hc. I also have a TCO wired to the line in of the heater but since I have multiple sensors available I may as well use them for some safety redundancy.
-
You can use the built in temp sensor as a over temp sensor by configuring M143 to monitor that sensor.
https://docs.duet3d.com/User_manual/Reference/Gcodes#m143-maximum-heater-temperature
Then use your drilled sensor for normal temp control.
You could also use daemon.g and conditional gcode to check the second sensor and take action accordingly if you want more control.
-
@Phaedrux perfect thanks. I was thinking putting something in daemon.g but figured there might be some built in function. Ill use M143 since I just want a shutdown if over temp.
