Diagram for capacitive sensor with optocoupler module

thingiverse

Diagram of connection between capacitive sensor and optocoupler module for autolevel function. Sometimes I was asked about the best auto level system for Anet A8 or P3Steel printer. No doubts, my choice is a capacitive sensor paired with an optocoupler module. The LJC18A3-H-Z/BX capacitive sensor stands out because it's adjustable from 1 to 10mm, making it versatile enough to work with various materials like aluminum and glass. The optocoupler module is straightforward; I prefer not to rely on a simple circuit using just a diode or voltage divider with resistors. To protect my mainboard, this setup is both cost-effective and easy to implement. I also have a design for a compact enclosure to house the optocoupler module. This project is still in progress. These components can be found at: [LJC18A3-H-Z/BX 1-10mm Capacitance Proximity Sensor Switch NPN](https://www.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://www.aliexpress.com/item/1-Channel-Optocoupler-Isolation-Module-Input-12V-No-Din-Rail-Holder-PLC-Processors-80KHz-PC817-EL817/32719957788.html) I am not affiliated with or do I receive any commission from Aliexpress. UPDATE 02/04/2019: Electronic scheme of the optocoupler module has been included. UPDATE 01/10/2019: Although it was never the purpose, detailed photos of the circuit are attached for those who want to build it themselves. UPDATE 05/16/2018: Case for optocoupler module is available on Thingiverse: https://www.thingiverse.com/thing:2914665 UPDATE 06/01/2018: Check the pins on your motherboard as they may not match the ones shown in the diagram.