Tronxy P802e Inductive/Capacitive Sensor Mount by srbaude86

Last crawled date: 3 years, 1 month ago

Mounting Bracket to Hold a LJC18A3-B-Z/BX Sensor
Suited to the Hotend Bracket of a Tronxy P802e from Aliexpress
Update
I have my probe working with Repetier Firmware and i thought i would post some notes given how little information there is on the Web.
LJC18A3-B-Z/BX Sensor Wiring
The Brown wire is +, Blue Wire is - and Black wire is Signal.
If using a Melzi board (like I am). I connect Brown to the 12V PSU +, Blue to PSU - and the Black Signal to the Z min endstop signal.
Repetier Firmware
I use Repetier firmware, please dont ask questions about Marlin as i have no idea.
Use the online tool https://www.repetier.com/firmware/v092/ to make changes to your firmware.
Make sure ALWAYS_CHECK_ENDSTOPS is set to false. This in on the Mechanics Tab.
On the Features Tab, enable Z-Probing and also set the method of Auto Bed leveling you want to use. I use n*n grid and set the grid to 4 (16 Z probe points). Leave the rest as default as you can set the Probe height, offsets and probe points in the eeprom.
I have my probe set to trigger when the nozzle is roughly 2mm above the print bed, so i have set my Probe height to 2mm.
To get the Z Probe value and you have a Z min end stop. Move the Nozzle so that the sensor is off your print bed and home Z so that it is just touching your print bed (manual calibration). Slowly move your nozzle so that the sensor is over the bed with the nozzle still touching the bed. Now move Z up 10mm and then send a G30 command to your printer. This is will return the value Z moved down when the probe was triggered, for example 8.23mm. Now subtract that value from 10mm. in my example 10- 8.23 would be 1.77mm. To be safe, set your Z probe Height in eeprom as 1.75 which gives 0.02mm clearance.
My Start G-Code is as follows.
G28 X0 Y0 ;Home X and Y
G1 Z10 F{Z_TRAVEL_SPEED} ;Move Z UP 10mm
G1 X150 Y150 F{TRAVEL_SPEED} ;Move X and Y to the centre of your print bed.
G28 Z0 ;Home Z (when the probe triggers it will then move down past the trigger point 2mm, as set as the probe height).
G1 Z10 F{Z_TRAVEL_SPEED} ;Move Z UP 10mm
G32 S2 ;Perform the auto levelling calibration
G32 S2 will store the calibration results in eeprom, which means if nothing changes, you dont have to perform the calibration everytime. And will remain after a Power Cycle. However, I like to run my calibration before everyprint, as i cannot guarantee that nothing has changed. It only takes a minute or two.
This is how i have setup my Prusa I3 Clone and it works for me. Warning, you may need to use different values. I hope at least some of this information helps somebody out - i know i would have liked to have known at least half of whats written here before i installed my probe - would have saved my me 2 days of yelling at my printer. Good luck