Tobbens Adding Inductive Proximity Sensor Log
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Introduction
This page documents adding a Research_On_Inductive_Proximity_Sensors#LJ12A3-4-Z.2FBX LJ12A3-4-Z/BX inductive proximity sensor to a Folgertech 2020 Prusa i3. Printer assembly up until this point is documented in Tobbens_Folgertech_Kit_Unboxing_Log and Tobbens_Folgertech_Kit_Assembly_Log. Not documented there is only the addition of an aluminum plate on top of the heat bed, like shown in the pictures below:
Theory
The sensor if of NPN type and normally open. We will feed it with 12 V and activate the internal pullup resistor on the Z_min sensor pin. Therefore we expect the following two states:
