Dyze thermistor no workie on Duet3/RRF3. Duet2 was ok


  • administrators

    Remove the R4700 parameter from your M308 command. You never need to use a R parameter on M305 and M308 commands for thermistors, except when using legacy Duets (Duet 06 and 085). The firmware knows the correct value. So leave it out, or you risk using the wrong value as you have done.



  • @dc42 yea i removed that and it didnt do anything....still -273 and bombs out when activated.
    I know is not the wiring or where is plugged in at because if I plug in a regular thermistor it works right away, so the wiring and port all check out ok, yet the dyze also seems to be ok when i test it with arduino
    am stumped....I think i printed enough filament to the moon and back with the Duet2 with this Dyze setup and it never skipped a beat....



  • @dc42 this is what Dyze has on their site for Repetier (thou looks like only v2.x)

    2020-03-12_09-16-39.jpg

    https://docs.dyzedesign.com/hotends.html#reprap-firmware



  • i think the issue is definitely RRF3 related, as more arduino testing confims the Dyze thermistor is working fine ......but as already discussed in other threads, its does a very poor job at low temps....compared to a cheap chinese thermistor...

    I am pretty certain it has something to do with warmup time since I notice the Dyze site indicates this parameters for Marlin firmware, but i do not know if this exists in RRF3

    #define MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED 5
    #define MILLISECONDS_PREHEAT_TIME 30000


  • administrators

    @imrj said in Dyze thermistor no workie on Duet3/RRF3. Duet2 was ok:

    @dc42 this is what Dyze has on their site for Repetier (thou looks like only v2.x)

    That's OK for Duet 2 (although the R4700 is still not required), but wrong for Duet 3.

    Which version of RRF are you using? Older RRF3 releases gave inaccurate readings at low temperatures. Try RRF 3.01-RC3. And make sure the R4700 is not in your M308 command.



  • M115
    FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC v0.6 or 1.0 FIRMWARE_VERSION: 3.01-RC2 ELECTRONICS: Duet 3 MB6HC FIRMWARE_DATE: 2020-02-18b1

    ill try RC3 now


  • administrators

    I don't think you will find any difference going to RC3.

    You can use the M308 H parameter to adjust the reading at low temperatures.



  • no luck trying a myriad of M308 figures....so i gave up and ordered a PT100 board and sensor instead....so i would say this thermistor is not compatible with either Duet3 or RRF3 , I just couldnt make it work and dont know if anyone else has (at least not over on the Dyze forums neither)


  • administrators

    @imrj said in Dyze thermistor no workie on Duet3/RRF3. Duet2 was ok:

    no luck trying a myriad of M308 figures....so i gave up and ordered a PT100 board and sensor instead....so i would say this thermistor is not compatible with either Duet3 or RRF3 , I just couldnt make it work and dont know if anyone else has (at least not over on the Dyze forums neither)

    That's odd, because I did a number of tests with Duet 3 using high value resistors, specifically to simulate a high-resistance thermistor. However, if your room temperature is below about 20C then that will make it hard to detect the thermistor.



  • I've also been unable to get the dyze thermistor working on rrf3. If anyone found a solution, I'd be happy to hear it.


  • administrators

    @schmluka said in Dyze thermistor no workie on Duet3/RRF3. Duet2 was ok:

    I've also been unable to get the dyze thermistor working on rrf3. If anyone found a solution, I'd be happy to hear it.

    Which version of RRF3?



  • @dc42 Release 3.0. Will check on 3.1.1.



  • @schmluka
    dont know if this will help, but this is my new setting, but not finish testing but a room temp, show me between 20 and 30 variable...

    M308 S0 P"bed_temp" Y"thermistor" T100000 B3950 ; define bed temperature sensor
    M308 S1 P"e0_temp" Y"thermistor" T4606017 B5848 C5.548428e-8 H0 L0 ;R4700 H0 L0 ;define E0 temperature sensor

    M140 H0

    M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
    M307 H1 A580.4 C256.6 D6.4 S0.50

    M950 H0 C"bed_heat" T0 ; heater 0 uses the bed_heat pin, sensor 0
    M950 H1 C"e0_heat" T1 ; heater 1 uses the e0_heat pin and sensor 1


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