Optocoupler PCB For Laser Etching For ABL

thingiverse

My new capacitive ABL kits are now available at https://www.ebay.com/itm/233183828678 with a competitive price @ $39.99, pre-configured firmware for Ender 3/3 Pro, CR-10 Series, and other non-creality printers that use a 2-wire normally closed Z endstop !!! Setup is extremely easy ,,, mount the probe (OEM Bracket), plug in power and the Z end stop connector, upload the ready-to-flash firmware and calibate! The kits have Vanilla Marlin firmware coming that has SD card & thermal run-away support. UPDATE 2/11/2019: Added "calibration coin" .stl file for positioning sensor offset when mounting. DETAILED setup documentation is also coming soon. Added my CR-10S Marlin source with the following enabled ... Original Creality boot and status screens PID Contol AutoTemp Bilinear ABL 4-Corner ABL Babystepping LCD-Adjustable Preheat EEPROM Store/Load/Failsafe LCD-Adjustable Software Endstops UPDATE 2/5/2019: Added gerber files (eagle.zip). CAM job is for Excellion machines which should be supported by many board houses. I use OSH Park. I've had to edit the .bmp for laser etching and experimenting to get the focus just right. The .jpg can be used for the photo-resist etching method or for toner transfer method. https://www.youtube.com/watch?v=8vNrOkRvHPQ UPDATE 2/4/2019: I'm about to try laser etching the first board using the Laser Etch software (link below). Tested with the capacitive sensor and all works well. Future mods to the circuit are a jumper for 12V/24V operation as not to fry the optocoupler's internal diode and possibly add a DC barrel jack. Videos will follow ... IMPORTANT !!!: For 24V power, replace resistors with value of 1k ohm. Also, check your Z endstop with a volt meter. The CR-10S was reversed from the Ender 3. On the Ender and CR-10 series printers the Z endstop is active HIGH. The endstop switch is normally closed, pulling the signal down to ground. If Zmin isn't triggered just reverse the connection. Optocoupler PCB design for use with capacitive proximity sensors. For now I am testing on a CR-10S with auto leveling enabled. I have prototyped this on veroboard and it triggers the Z end stop perfectly. Runs on 9 to 12 volts from your PSU or external power source. More on this project as it progresses, but the PCB does work. Tested on a Creality Ender 3 Pro and CR-10S with a 2-wire Zmin cable. PCB Dimensions: 33.96mm x 20.31mm (.dxf file ) Here is the etching software I use for PCB's. Just open the image, adjust your settings, and the PCB image will be the correct size. Laser Etch: https://jtechphotonics.com/?product=laser-etch-bw-image-engraving-sw-license Sensor: (NPN Type / Normally Open) https://www.amazon.com/gp/product/B0746FYF5S/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1 BOM: 1 x screw terminal or Molex connector for power input 2 x molex JST connector for sensor and endstop 2 x 470 ohm resistors (use 1k ohm for 24V operation) 1 x LED 1 x general purpose reverse protection diode 1 x PC817 or EL817 optocoupler