RRF3 and pb6



  • I read the wiki for tacho wire https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Connecting_4_wire_fans and I don't understand if I have to declare the pin exp.pb6 with M950 for read the PWM or not.

    The documentation only tell of connect the wire, no configuration is shown :
    "Tacho wire (whatever wire is left, usually green or yellow): optionally, connect it to the cathode of a small signal diode (1N4148 should be OK) and connect the anode of the diode to pin PB6 on the expansion connector if the Duet WiFi/Ethernet, to provide a reading of the fan RPM"

    Board is Duet2Wifi 1.04b, with RRF 3.0

    Fan section in my config.g:

    ; Fans
    M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1 C"PartCooling"                  ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
    M106 P1 H1 T45                       ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M950 F2 C"fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
    M106 P2 H2:4 L0.0 X0.05 B0.5 T45:55    ; set fan 2 value, turn on at 50% if the CPU temperature reaches 45C, and increase to full speed gradually as the temperature rises to 55C
    

  • administrators

    Yes you do, use e.g. C"fan0+^exp.pb6" in your M950 command.



  • I want monitoring a flow meter, not FAN0.
    If I use C"fan0+^exp.pb6", there is a li,k between fan0 and pb6 ?


  • administrators

    @pipersw said in RRF3 and pb6:

    I want monitoring a flow meter, not FAN0.
    If I use C"fan0+^exp.pb6", there is a li,k between fan0 and pb6 ?

    The link is that Duet Web Control may associate the RPM reading with fan0.


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