Bed PT100 Sensor



  • Morning All,

    I have been scouring the forum and have come across only one mention of this. I am building an Ultimaker+ Extended Clone, my heated bed has a PT100 sensor. I assume I can not use the standard bed thermistor pins for this and it will have to go through the PT100 daughter board. It seems obvious but I just wanted to get it clarified before I go and damage something!

    Also if in the future I increased the amount of PT100s required e.g. added another hotend, is there a way of expanding the number of PT100s the Duet Wifi can handle?



  • The DuetWiFi can handle 2 Daughter boards that can each handle 2 Sensors so you can have 4 Pt100's or 4 Type K thermocouples or 2 of each depending on which Boards you fit.



  • @Dougal1957:

    The DuetWiFi can handle 2 Daughter boards that can each handle 2 Sensors so you can have 4 Pt100's or 4 Type K thermocouples or 2 of each depending on which Boards you fit.

    Does it plug into the top of the 1st daughter board?


  • administrators

    @Syko_Symatic:

    @Dougal1957:

    The DuetWiFi can handle 2 Daughter boards that can each handle 2 Sensors so you can have 4 Pt100's or 4 Type K thermocouples or 2 of each depending on which Boards you fit.

    Does it plug into the top of the 1st daughter board?

    Yes.



  • @dc42:

    @Syko_Symatic:

    @Dougal1957:

    The DuetWiFi can handle 2 Daughter boards that can each handle 2 Sensors so you can have 4 Pt100's or 4 Type K thermocouples or 2 of each depending on which Boards you fit.

    Does it plug into the top of the 1st daughter board?

    Yes.

    I have everything wired up and the PT100 on the head reads room temp! (YAY) the bed PT100 though reads 415 degrees? It also fluctuates if I keep my hand on the bed, so it seems to be functioning. It just seems to be way off? As if it needs to be reset or something?

    How do I define it correctly for the bed? currently my setup looks like this:

    ; Communication and general
    M111 S0                             	; Debug off
    M550 PUltiFaker		; Machine name and Netbios name (can be anything you like)
    M551 Preprap                        	; Machine password (used for FTP)
    ;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
    M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xAB 	; MAC Address
    ;*** Wifi Networking
    M552 S1				; Enable WiFi. Disabled for setup and testing. Enable once set up on your network.
    
    M555 P2                           	; Set output to look like Marlin
    M575 P1 B57600 S1			; Comms parameters for PanelDue
    
    ; Configuration file for Duet WiFi
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Nov 17 2016 21:40:07 GMT+0100 (W. Europe Standard Time)
    
    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P2 ; Set firmware compatibility to look like Marlin
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X210 Y210 Z300 S0 ; Set axis maxima
    
    ; Endstops
    M574 X1 Y1 Z1 S0 ; Define active low and unused microswitches
    M558 P0 X0 Y0 Z0 H5 F120 T6000 ; Set Z probe type to switch, the axes for which it is used and the probe + travel speeds
    ;G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
    
    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes backwards
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards
    M350 X16 Y16 E16:16 I0 ; Configure microstepping without interpolation
    M350 Z16 I1 ; Configure microstepping with interpolation
    M92 X78.7402 Y78.7402 Z535 E420:420 ; Set steps per mm
    M566 X1200 Y1200 Z24 E120:120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X8100 Y8100 Z8100 E1200:1200 ; Set maximum speeds (mm/min)
    M201 X3000 Y3000 Z3000 E250:250 ; Set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800:800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    
    ; Heaters
    M143 S310 ; Set maximum heater temperature to 310C
    M305 P0 T10000 B3988 C0 R4700 L0 H0 X201; Set thermistor + ADC parameters for heater 0
    M305 P1 T100000 B4138 C0 R4700 L0 H0 X200 ; Set thermistor + ADC parameters for heater 1 and remap it to channel 201
    
    ; *** Thermistors / PT100 RTD
    M305 P0 X201                            ; PT100 Bed, RTD1, channel 201
    M305 P1 X200                            ; PT100 Tool 0, RTD2, channel 200
    M143 H0 S135                            ; Maximum temperature - Heated bed    , default is 125C 
    M143 H1 S290                            ; Maximum temperature - Right  extruder, default is 262C
    M570 S180                               ; Hot end may be a little slow to heat up so allow it 180 seconds
    
    ; Tools
    M563 P0 D1 H1 ; Define tool 0
    G10 P0 X0 Y0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
    
    ; Fans
    M106 P0 S1 I0 F500 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P2 S1 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
    
    ; Custom settings are not configured
    
    

  • administrators

    Your configuration looks ok to me. What happens if you swap channels on the PT100 board?


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