Diagram for capacitive sensor with optocoupler module

Diagram of connection of the capacitive sensor, for the autolevel function, with an optocoupler module.

Sometimes, i was asked for the best auto level system, for a Anet A8, or P3Steel printer. No doubts, for me a capacitive sensor with a optocoupler module.

The LJC18A3-H-Z/BX, capacitive sensor, because, is adjustable from 1 to 10mm, no matter the material to detect. With Aluminium or glass, is good.

The optocoupler module, is easy, i'm not trust with a simple circuit with a diode, or a tension divider, with a couple of resistors.

I need to protect my mainboard, and this way is cheap and easy.

I have, also a design , a little box, to encapsulate the optocoupler module.

Still working in this.

This items, can be found at:

[LJC18A3-H-Z/BX 1-10mm Capacitance Proximity Sensor Switch NPN](https://es.aliexpress.com/item/High-Quality-LJC18A3-H-Z-BX-1-10mm-Capacitance-Proximity-Sensor-Switch-NPN-NO-DC-6/32735795048.html)


[12V 1 Channel Optocoupler.](https://es.al