Reading negative temperature and N/A temp

[jay_s_uk]

I would set the values to the following

M305 P0 T10000 B3950 R4700               ; set thermistor + ADC parameters for heater 0
M143 H0 S120                             ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280                             ; set temperature limit for heater 1 to 280C

The P0 is a generic 3950 which is what tends to be used by chinese suppliers.
The P1 is correct for a 104GT

I would remove the P2 as this is probably confusing things.

If you're still getting no values, I would revisit your crimping

[johny]

I did those changes and i even solder a pair of wires directly to the bed thermistor to bypass any broken cable, the magic number is still there.
Probably is something burn in the board, what could it be?
Thank you

[jay_s_uk]

You could try remapping the bed thermistor to P2 and connecting to the e1 temp header and see if you get a reading

[johny]

I did it, no luck, still same error :S
I unplugged a thermistor from another printer to check it if was the thermistor and the same result.

[A Former User]

(Don't think there is one)

[johny]

@bearer said in Reading negative temperature and N/A temp:

(Don't think there is one)

Well i measure between the vssa and gnd and i got 3 ohms.
I just checked that my heat bed had a short between the +12v and gnd but i got no readings even before plugging it.

[blt3dp]

What version of the firmware does M115 report? Might be useful in troubleshooting.

[johny]

@blt3dp said in Reading negative temperature and N/A temp:

M115

M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.0 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-01-03b3

[blt3dp]

@johny said in Reading negative temperature and N/A temp:

FIRMWARE_VERSION: 3.0

That's why you're not getting a reading, you need have to define the pin that it's using.

[jay_s_uk]

@johny

Use

; Bed Heater
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 C0 R4700				; Set thermistor + ADC parameters for heater 0
M950 H0 C"bedheat" T0                               		; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00
M140 H0
M143 H0 S130                               					; Set temperature limit for heater 0 to 120C

; Extruder Heater
M308 S0 P"eotemp" Y"thermistor" T100000 B4275 C7.060000e-8  R4700							;
M950 H1 C"e0heat" T1                                		; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S400     

[blt3dp]

@jay_s_uk said in Reading negative temperature and N/A temp:

@johny

Use

; Bed Heater
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 C0 R4700				; Set thermistor + ADC parameters for heater 0
M950 H0 C"bedheat" T0                               		; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00
M140 H0
M143 H0 S130                               					; Set temperature limit for heater 0 to 120C

; Extruder Heater
M308 S0 P"eotemp" Y"thermistor" T100000 B4275 C7.060000e-8  R4700							;
M950 H1 C"e0heat" T1                                		; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S400     

Yep, use that. In fact, looks like you're either modifying or creating a new config file based off of a RRF2x one. You might want to run through the web configurator and generate one for RRF3

[johny]

I used and got a different error!

[johny]

[blt3dp]

Most likely your tool settings. Update these secttions.

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4267 C7.06e-8 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                                   ; create bed heater output on bedheat and map it to sensor 0
M143 H0 S130                                            ; set temperature limit for heater 0 to 130C
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
M308 S1 P"e0temp" Y"thermistor" T100000 B4267 C7.06e-8  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                                    ; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S275                                            ; set temperature limit for heater 1 to 275C
M307 H1 B0 S1.00                                        ; disable bang-bang mode for heater  and set PWM limit

; Tools
M563 P0 D0 H1 F0                                        ; define tool 0
G10 P0 X0 Y0 Z0                                         ; set tool 0 axis offsets
G10 P0 R0 S0                                            ; set initial tool 0 active and standby temperatures to 0C

[johny]

@blt3dp said in Reading negative temperature and N/A temp:

; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

And magic!!!! i get readings!!!! thank you a lot m8! i was starting to get crazy with it! need to check if it heats up!
thank you!

[johny]

It heats!!!! Thank you, i rly appreciate it!