Thermistor on 3HC not recognized

JNB

Hey guys,

I bought a Duet3 MB 6HC and a 3HC to rework my Tenlog Hands 2, which has pretty annoying Bugs in it's firmware and is very limited.

At the moment I'm planning all the connections and adapter-PCBs needed and found a little problem what I'm not getting over....

I connected the thermistor of one of my hotends with the temp0 port on the 3HC (so P"1.temp0"), but the controller still shows 2000C or n/v in the webinterface.

After searching a bit I tried connecting a 1k resistor, didn't changed anything at all, the thermistor has a resistance of approx. 107k at room temperature (around 25C or warmer today).

Does anyone has any idea where the problem comes from?

My config:

; Heaters
M308 S0 P"0.temp0" Y"thermistor" T100000 B4138    ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                              ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00                                ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                         ; map heated bed to heater 0
M143 H0 S150                                    ; set temperature limit for heater 0 to 150C
M308 S1 P"1.temp0" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin 1.temp0
M950 H1 C"1.out0" T1                            ; create nozzle heater output on 1.out0 and map it to sensor 1
M307 H1 B0 S1.00                                ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                    ; set temperature limit for heater 1 to 280C
M308 S2 P"1.temp1" Y"thermistor" T100000 B4138  ; configure sensor 2 as thermistor on pin 1.temp1
M950 H2 C"1.out1" T2                            ; create nozzle heater output on 1.out1 and map it to sensor 2
M307 H2 B0 S1.00                                ; disable bang-bang mode for heater  and set PWM limit
M143 H2 S280                                    ; set temperature limit for heater 2 to 280C

I also tested the 1.temp1 port with same result... same thermistor on 0.temp0 (bed) gives me a reading of 20.2C, so I guess the thermistor is ok...

Thanks in advance.

JNB

jay_s_uk

what firmware are you running on the 6HC and 3HC?
post the output of M115 and M115 B1

droftarts

@jnb Your config looks okay. Most likely is that the firmware of the 3HC is not the same as the 6HC. Send M122 (to see firmware version on 6HC) and M122 B1 (to see the firmware version on the 3HC). Post the responses if you're not sure.

Ian

JNB

@jay_s_uk

Sorry, could have supplied it directly....

MB 6HC:

FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.2.2 ELECTRONICS: Duet 3 MB6HC v1.01 or later FIRMWARE_DATE: 2021-02-11

3HC:

Board EXP3HC firmware 3.1.0 (2020-05-15b1)

droftarts

@jnb Update the 3HC board firmware. Or update both to the just-released RRF 3.3!

Ian

jay_s_uk

@jnb you need to upgrade your 3HC firmware
Use M997 B1 (assuming you have the 3.2.2 firmware in the sys folder)

JNB

@droftarts

Thanks for the quick help, I'll try this and give a feedback!

JNB

@jay_s_uk @droftarts

Updating totaly solved the problem... sometimes the easiest fixes are the best ones....

Thanks for your fast support!

JNB