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



  • 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!


  • administrators

    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.



  • 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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