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

t0bias

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!

dc42

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.

t0bias

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!)