A10 Capacitive Bed Levelling Sensor

[RepMike]

Hi, how can I connect this sensor to the A10? (LJC8A3-H-Z/BX). I know how to create a Voltage Divider for this thing so the output is around 5V, but I where would I connect the signal line to?

Are the spare pins on the X-carriage any use for this? What's their pinout anyways?

Thanks for any hints.
Michael

IMG_8953.JPG (340.9 KiB) Viewed 13683 times

[Wolle82]

Same pins as z-axis? ... The only you don't need is the VCC from the board if you take a voltage devider to connect the 24V directly. The other (more safe) method is to use a optocoupler.

[Wolle82]

Here is my mount: https://www.thingiverse.com/thing:3146974

[Wolle82]

Connection types U will find here:
https://www.geeetech.com/forum/viewtopi ... 6&start=10

[Wolle82]

But with this sensor (LJC18A3-H-Z/BX) we dont need the 150kOhm resistor because the sensor has a build-in resistor at 10kOhm. So all we need is a single resistor (R2 = 100kOhm here in the picture) at 2.2kOhm... The voltage will be at 4.5V out at 24V in. That should be okay.

[Wolle82]

[Wolle82]

Board: GT2560 Rev B
Endstops connector (schematic):

Code: Select all

VCC     |   VCC   
Z_MAX   |   Z_MIN
GND     |   GND   
VCC     |   VCC   
Y_MAX   |   Y_MIN
GND     |   GND  
VCC     |   VCC   
X_MAX   |   X_MIN
GND     |   GND

VCC = 5V (Not needed if you use a voltage devider at 24V for the sensor, be sure to devide the voltage to <=5V)
*_MIN, *_MAX = Signal (IN)
GND = Ground

[RepMike]

Thanks for this exhaustive information! I appreciate it! I will use a LM2596 Voltage regulator module in order to step the 24V down to 5V. That's a clear thing. When I change something months later, it's easier for me to see what's going on without a doubt. And it would be the same method which I've been using with another printer and is kind of consistent with that one.

[Ricky1966]

Hi. I'm very intresting about the implememtation of this sensos, for this, I've some quesrions :
- have you done it?
- which firmware in your printer?
- if you have mounted the support above linked, have you modify the xy of the level points?
Tks for news