Is there any 8th Extruder Heater output pin?



  • If I want to use 8 Extruder, I can use 2 Stepper Drivers on Duet2 Wifi + 5 Stepper drivers on Duex 5 + 1 Stepper Driver from CONN_LCD pin on Duex 5 = 8 Stepper Drivers.

    And I can use 4 pcs PT100 Daughter Boards that have 8 total input pin PT100 temperature sensor.

    But, for Extruder Heater Output Pin I only found 2 pins on Duet 2 Wifi + 5 pins on Duex 5 = 7 output pins.

    I need 1 Extruder Heater output pin more so I can use total 8 Extruders.

    Is there any 8th Extruder Heater pin on Duet2 Wifi/Duex 5 that I can use?


  • administrators

    There isn't an 8th extruder heater output, however in RRF 3 I can increase the maximum number of heaters so that you could use one of the fan outputs on the Duet to drive a heater via a mosfet switch or SSR. Of, if you are already using an SSR to drive the bed heater, you could drive that from a fan output and connect an extruder heater to the bed heater output.



  • Can you give me some guide for set up the fan outputs in RRF3?
    Actually I have already using a SSR for drive the Bed Heater, I'm not intend to switch bed heater output to extruder heater output.

    I think I need 1 external mosfet more to drive 8th extruder heater as you suggested.


  • administrators

    @arief said in Is there any 8th Extruder Heater output pin?:

    Can you give me some guide for set up the fan outputs in RRF3?

    See https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview. Please note, you will need to wait until I make a new beta available later today in order to configure more than 8 heaters.

    Actually I have already using a SSR for drive the Bed Heater, I'm not intend to switch bed heater output to extruder heater output.

    I think I need 1 external mosfet more to drive 8th extruder heater as you suggested.

    What iImeant is that as you are using an SSR to drive the bed heater, and an SSR input can be driven by a fan output, then using RRF 3 you can reassign heater 0 to to a fan output. Then the bed heater output will be free for your extra extruder heater, and you won't need an external mosfet.


 

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