Another Temp daughterboard problem
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I'm in the process of setting up a printer with a duet3 mini 5+. I have the temperature daughterboard for it, and am tried to set it up in my config file.
From the documentation, it looks like I should use M308:
M308 S3 Y"thermistor" P"spi.cs1" T100000 B4138But when it boots up, I get an error "pin spi.cs1 doesn't support analog input"
What am I doing wrong? -
@larrylf said in Another Temp daughterboard problem:
I have the temperature daughterboard for it
Can you be more specific? Is it a PT100 or thermocouple daughterboard?
https://docs.duet3d.com/en/Duet3D_hardware/Accessories/PT100_Temperature_Daughterboard
https://docs.duet3d.com/en/Duet3D_hardware/Accessories/Thermocouple_Daughterboard
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@larrylf the Y parameter in your M308 command is wrong. The sensor is not a thermistor.
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@phaedrux Sorry, it is the PT100 board, and I am using a thermistor in it.
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@dc42 Oh, so you're saying that I have to identify it as the board, not what its used for?
I'll try to find what it should be, then -
@larrylf yes, that worked - thank you
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@larrylf you are not going to get accurate temperatures using a thermistor with the PT100 board. As temperature increases, a thermistor’s resistance decreases; a PT100’s resistance increases. So a thermistor connected to the PT100 board will report a drop in temperature as temperature increases.
You can connect a thermistor or PT1000 directly to the temperature inputs on the Duet; you don’t need a daughterboard.
Ian
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@droftarts yes, the thermistor was a mistake - in fact, I seem to have the wrong sensors everwhere (PT100's in the mainboard TEMP, thermistor in the daughterboard).
Fixed now, but frustrating...