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Invert Chamber heater signal

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Duet Hardware and wiring
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  • undefined
    Rom
    last edited by 15 Jul 2019, 08:23

    Hi! I have chamber heater on pin8 (Heater3), but it logical 0 active. Can I invert signal in G-Codes or somewhere else by software? I have ULN2003 connected to pin8 and Chamber power on by command M141 S0, and power off by M141 S100.

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    • undefined
      dc42 administrators
      last edited by 15 Jul 2019, 09:45

      In RepRapFirmware 3 you can invert any pin, see https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview.

      Caution, the heater outputs are pulled high at power up by the internal pullup resistor in the MCU. That's why we used active low signals. You can defeat the internal pullup using a pulldown resistor. Suitable values are 2.2K to 4.7K.

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

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      • undefined
        Rom
        last edited by 15 Jul 2019, 12:00

        will try it. thank's!

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