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My personal touch, "The JackyTouch"

Expected performances

Number of probes : 50

G28
M48 P50 V2
...
Mean: -0.004780 Min: -0.008 Max: -0.002 Range: 0.006
Standard Deviation: 0.001467
ok P15 B0

Hardware

  • 1 x Optocoupler module LM393 comparator Slot-Type 3.3V-5V for arduino based
  • 2 x N52 super strong cylinder magnets 6mm x 3mm rare earth neodymium Magnets
  • 1 x Steel rode d=4 l=50
  • 1 x A mouse wire

Assembly

Firmware (Marlin)

Configure a TOUCHMI probe that uses the same operating principle.

MyCR10-S_2.1 Branch on github

Sensor wiring

Original Creality board pinout

CR10S-V2.1

MKS-Robin-E3D pinout

MKS-Robin-E3D-V1.0

LM393 pinout

LM393

  • VCC: Module power supply.
  • GND: Ground.
  • D0: Digital signal of the output pulses.
  • A0: Analog signal of the output pulses (not used).

Wiring

  • Remove the old Z limit switch connector from the board.

  • Connect the new sensor to the board. Be careful !!!

Connect the VCC wire first, then the GND wire.

If the power indicator led is off, you made a mistake. Reconnect the GND wire correctly.

To avoid a short circuit, connect the D0 wire only if the sensor is powered correctly.

Calibrating Z-offset (Pronterface)

  • Enable the probe (Press the button to lower the probe)
  • Launch Pronterface
  • Do Homing and read current Z-offset
...
echo:Z-Probe Offset (mm):
echo:  M851 Z-6.43
...
  • Reset current offset (help)
M851 Z0
  • Store offset to EEPROM (help)
M500
  • Set EEPROM as active parameters (help)
M501
  • Display current active settings (help)
M503
  • Home Z axis only (help)
G28 Z0
  • Move nozzle to 0.0 Z offset (help)
G1 F60 Z0
  • Switches off soft endstops (help)
M211 S0

  • Manually slide a pice of paper (0.1mm) under the nozzle and slowly move the nozzle downwoards until the paper can barely move due to the friction of the nozzle and the bed.

  • Look at the Z-offset value at the printer screen and take a note about it

-6.3 mm
  • Set Z-offset (add the paper thickness to the previous value)
M851 Z-6.4
  • Switch on soft endstops
M211 S1
  • Store current settings to EEPROM
M500
  • Set EEPROM as active parameters
M501
  • Display current active settings
M503
  • Do homing
  • Move to 0 and check again with the paper
G1 F60 Z0

gcode updates (Cura)

Machine settings -> Start G-code

G28 ; Home (Enable device)
G29 ; Auto bed leveling
G1 Z0.2 ; Down to 0.2mm (Disable device)