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    5V Inductive Z-Probe Signal to Z-Probe_IN Pin?

    Duet Hardware and wiring
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    • t0bias
      t0bias last edited by

      Hello everybody,

      I have a Prusa PINDA-Probe-like 5V Inductive Sensor on my Printer. I don't want do use it as a Z-Endstop (I already have a Microswitch in place for that), but for Bed-Leveling/-Level-Correction. Is it safe to wire the Z-Probe Signal Pin to the Z-Probe_IN Pin on the Duet Wifi (I've fed the probe with +5V from the Expansion-Header (P1)) or do I need to have a 5V-3V3-Level-Converter in between?
      If so, can someone maybe recommend a certain type?

      Thanks!

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      • dc42
        dc42 administrators last edited by

        In theory you should use a diode between the probe output and the Z probe input. In practice, applying 5V to the Z probe input is most unlikely to damage it.

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        • t0bias
          t0bias last edited by

          Thanks for your reply. I ended up wiring it like this in case someone else comes across this issue:

                            Prusa PINDA Probe
           +------------------------------------------------+
           |                                                |
                 BLACK            BLUE             BROWN
               (SIGNAL)           (GND)            (+5V)
                   +                +                +
                   |                |                |
                   |                |                |
                   |                |                |
                 +-+-+              |                |
                 |   |              |                |
          4.7kΩ  | R |              |                |
                 |   |              |                |
                 +-+-+              |                |
                   |                |                |
                   +-------+        |                |
                   |       |        |                |
                   |       |        |                |
                   |   +   |        |                |
                   |   +---+---+    |                |
                   |      / \  +    |                |
                   |     / Z \      |                |
                   |    /  D  \     |                |
                   |   /  3.3V \    |                |
                   |   +---+---+    |                |
                   |       |        |                |
                   |       |        |                |
                   |       +--------+                |
                   |                |                |
                   |                |                |
                   |                |                |
                   |                |                |
                   |                |                |
                   |                V                V
                   |            |                        |
                   V            +------------------------+
                                  Duet3D Expansion Header
           Duet3D Z_Probe_IN       Pins 2 & 1 (GND, +5V)
          
          

          (in different setups another resistor might be more suitable!)

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          • speeli
            speeli last edited by

            i have the same probe,5V pinda probe.

            i testet it on a raspberry pi with the 3,3V output and it worked.

            is it save to use the z probe input for it?

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