Duet and 500c Dyzend thermister

Hey Chris or David,

Has or can the firmware handle the Dyze Design Dyzend 500c thermistor they are using? They have published firmware configs for Marlin, Repetier and Smoothie.

I know I could just buy a E3Dv6 and get on with it but something has got me intrigued with the Dyzend..... nearly hit buy twice in three days

Cheers
Phil

As long as you can get the B value for the thermistor and use M143 to set the maximum temperature
I don't see why the Duet can't handle it

If you provide a link to either the thermistor datasheet or preferably its resistance vs temperature table, then I can give you the B value to use in the M305 command in config.g.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

The table is in the second post of this thread:
[groups.google.com]

Thanks PRZ and Dave (in advance of the value)

guess I'll go and buy a dyzend now so I can design the effector mount and cooling setup..... think my large delta is becoming Big Expensive Experience, with a real sting to the wallet by the time I pair that with a Bondtech QR i'll have spent more on those two bits than many spend on a smaller machine

Cheers

Based on that temperature table, in your M305 command for that hot end you should use a T value of 4500000 and a B value of 5120. I have chosen the B value to give best accuracy in the 200 to 280C range.

That thermistor has a very high resistance (4.5Mohms) at 25C, which may be problematic - and not just with the Duet. You will need an H correction to get reasonable indication at room temperature. Depending on the SAM3X chip on your Duet, you may find that you always get a reading of -273C at room temperature, but you can get readings at higher temperatures e.g. by heating the hot end with a hair dryer. If so, you will need to connect a resistor in parallel with the thermistor to get it to read at low temperatures.

IMO a thermocouple or RTD would be a better option than a thermistor for covering a wide range of temperatures.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].