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    SOLVED 12864 LCD Maestro set up : Daig LED lights up and board resets

    Duet Hardware and wiring
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    • kingfisher
      kingfisher last edited by

      I’ve been trying to install an old 12864 panel I had lying around on my Maestro

      I’ve added M918 P1 E2 to my Config

      And connected the 2 ribbon cables

      The LCD panel doesn't light up (It appears the board version I have has the pedometer hidden so this might be an issue?)

      But when I turn the encoder the “LED diag” on the main board lights up and if I go too fast the board resets?

      I’ve unplugged the LCD & rebooted and it appears that everything still appears to work OK.

      Can someone confirm the LED daig should light up when the encoder moves and are there any other steps I need to take to get this working

      FYI I only currently have one file with text R3 C5 F1 T"Duet Maestro Self-Test" in 0:/menu/main atm

      Firmware Name: RepRapFirmware for Duet 2 Maestro
      Firmware Electronics: Duet Maestro 1.0
      Firmware Version: 2.02RC5(RTOS) (2018-11-28b1)
      Web Interface Version: 1.22.5

      Thanks in advance

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      • dc42
        dc42 administrators last edited by dc42

        It sounds like incompatible pin connections to me. Are you sure you don't have the two cables crossed? But don't just swap them to see what happens.

        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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        • kingfisher
          kingfisher last edited by

          Thanks
          I double checked that exp1 = exp1
          I remember from my smoothieware days that some MKS based boards had the connectors swapped 180 degs. I'll have a search around.
          Is there an easy way to check the pin layout of the LCD vs the Duet?

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          • dc42
            dc42 administrators last edited by

            I've heard that on the Ender 3, both connectors are swapped 180deg too.

            The pinout we expect is this, as on the original (badly named) RepRapDiscount Full Graphics Smart Controller:

            0_1553016504499_d5b529c9-c159-4bac-bf48-da51b4368ac1-image.png

            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

            kingfisher 1 Reply Last reply Reply Quote 0
            • kingfisher
              kingfisher @dc42 last edited by

              @dc42 Thanks, using my limited electrical skills I have used the continuity test mode on my meter on the LCD board. The Beep pin is in the expected position for the buzzer, but on exp2 reset_ext its rotated 180 degrees (eg Pin 3 of P1 EXP2)

              I've ordered a new board on Prime as they are fairly cheap - I'll compare the two before installing.

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              • kingfisher
                kingfisher last edited by

                @dc42 The new LCD arrived today and the pins on the new board were in the above orientation when I tested it with the meter, I plugged it in and it works perfectly

                I think the old one was an MKS one from Ailexpress and as you suspected the pins were rotated.

                It might be worth adding a warning on the wiki ensure others don't have the same issues (But in my case no long term damage was done)

                Thanks again for the support in solving the issue

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