A10 Capacitive Bed Levelling Sensor

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RepMike
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Joined: Tue Jul 04, 2017 6:06 am

A10 Capacitive Bed Levelling Sensor

Post by RepMike » Sun Oct 07, 2018 7:49 pm

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
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Wolle82
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 4:03 pm

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
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 11:18 pm


Wolle82
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 11:20 pm


Wolle82
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 11:23 pm

Image

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.
Last edited by Wolle82 on Wed Oct 10, 2018 11:34 pm, edited 5 times in total.

Wolle82
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 11:27 pm

Image

Wolle82
Posts: 48
Joined: Thu Sep 06, 2018 9:19 am

Re: A10 Capacitive Bed Levelling Sensor

Post by Wolle82 » Wed Oct 10, 2018 11:43 pm

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
Posts: 18
Joined: Tue Jul 04, 2017 6:06 am

Re: A10 Capacitive Bed Levelling Sensor

Post by RepMike » Fri Oct 12, 2018 1:58 am

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
Posts: 49
Joined: Wed Oct 17, 2018 8:56 pm

Re: A10 Capacitive Bed Levelling Sensor

Post by Ricky1966 » Wed Jan 16, 2019 7:08 pm

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 :D

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