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Auto Bed Leveling (ABL) issues on G2S Pro
Posted: Fri Dec 30, 2016 2:47 am
by aleXall
The following message occurs on Repetier msg board, when G29 command run by gcode
Code: Select all
G29 Auto Bed Leveling
?Probe position out of range.
?Probe position out of range.
Instead when I send manually G28 G29 sequence, it works
I've tried also to move G28 G29 lines up or down at start of gcode, with no results.
By intuition placed G4 command before and after G29 and now it works!!
In Slic3r/Printer Settings/Custom gcode/Start g-code textbox I've placed the following code
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G28 ; home all axes
G4 P500 ;PAUSE 500ms to prevent ABL failure - motherboard need time to understand :D
G29; Auto-calibration
G4 P100 ;PAUSE 100ms to prevent ABL failure - G0 G1 codes after G29 make it failure!
G0 Z50 F3000 ; lift nozzle
All problems seemed solved... But no!!
With ABL functioning correctly now,
prints are not parallel to bed, but slanted so that it adheres only to one side
Are there any solutions?
Re: Auto Bed Leveling (ABL) issues on G2S Pro
Posted: Sat Aug 25, 2018 9:49 am
by dohabandit
Has anyone here tried replacing the ABL probe with an inductive type probe?
I ordered a 4mm type and will be attempting to get it installed shortly. The metal springloaded probe was binding up and very unreliable. I am giving up on the stock probe.
This new probe requires 12v, so I am wondering which route to go:
1) Use two resistors to make a voltage divider and get the voltage down to 5v for the uCPU input pins (really don't want to fry my GT2650 board).
2) Use a diode and internal pullup setting. The diode basically lets the input "float" when the inductive sensor would normally close and supply +12v which the diode blocks. Combined with internal pullup setting on the probe input, it goes high to 5v and is read as a high. Otherwise, the input pin is pulled to GND by the inductive sensor and that reads as a LOW. Question is, where do I enable the internal pull up resistor setting in the Marlin firmware? Is this even supported by the GT2650 board? (not all GPIO pins support settable pull-up or pull-down resistors) I will freely admit I don't know a lot about the GT2650 board and the microcontroller it is based on. Will be doing some research soon though because I have already ordered the inductive sensor.
My brother has a $80k CNC machine in his metal fab shop. Once I get this figured out, I will likely have some aluminum cut on his CNC that allows me to mount both the J head and inductive sensor in the center of the spider. I will upload some pics as it progresses. I have seen someone else has a design printed in PLA on thingiverse, but in my experience with the J head and PLA mount, I would rather have a piece of aluminum doing the job.
Re: Auto Bed Leveling (ABL) issues on G2S Pro
Posted: Sat Aug 25, 2018 1:15 pm
by _kaktus_
Hi
Your solutions sound sensible.
If you fail to switch on the internal Pull-up resistor at the µC input, you can always use an external resistor.
Remember that µC pins can be pulled up to a maximum supply voltage of µC.
When you don't want high pull-up or pull-down current, a reasonable resistor value is 10kΩ.
It is worth to check if the supply voltage µC in your controller is not 3V3.