Cnc Shield- End switch problem

[carlob]

Hello everyone,
i'm on a testing stage on my hardware for a diy cnc mill.
I'm facing some issues connecting my end-switches to the cnc shield.I have to say that they used to work last week, but now no way to have them working.
I have cnc shield connected to external driver.
I attach the cabling and the grbl settings, maybe someone can point me in the right direction.
And also how can i check with a tester if the end switch pins are ok or damaged?
Thanks alot and sorry for my bad english:-)
Carlo

$0 = 25 (Step pulse time, microseconds)
$1 = 25 (Step idle delay, milliseconds)
$2 = 0 (Step pulse invert, mask)
$3 = 0 (Step direction invert, mask)
$4 = 0 (Invert step enable pin, boolean)
$5 = 0 (Invert limit pins, boolean)
$6 = 0 (Invert probe pin, boolean)
$10 = 3 (Status report options, mask)
$11 = 0.010 (Junction deviation, millimeters)
$12 = 0.002 (Arc tolerance, millimeters)
$13 = 0 (Report in inches, boolean)
$20 = 0 (Soft limits enable, boolean)
$21 = 1 (Hard limits enable, boolean)
$22 = 1 (Homing cycle enable, boolean)
$23 = 7 (Homing direction invert, mask)
$24 = 25.000 (Homing locate feed rate, mm/min)
$25 = 500.000 (Homing search seek rate, mm/min)
$26 = 250 (Homing switch debounce delay, milliseconds)
$27 = 1.000 (Homing switch pull-off distance, millimeters)
$30 = 1000 (Maximum spindle speed, RPM)
$31 = 0 (Minimum spindle speed, RPM)
$32 = 0 (Laser-mode enable, boolean)
$100 = 250.000 (X-axis travel resolution, step/mm)
$101 = 250.000 (Y-axis travel resolution, step/mm)
$102 = 402.000 (Z-axis travel resolution, step/mm)
$110 = 800.000 (X-axis maximum rate, mm/min)
$111 = 500.000 (Y-axis maximum rate, mm/min)
$112 = 800.000 (Z-axis maximum rate, mm/min)
$120 = 10.000 (X-axis acceleration, mm/sec^2)
$121 = 10.000 (Y-axis acceleration, mm/sec^2)
$122 = 10.000 (Z-axis acceleration, mm/sec^2)
$130 = 200.000 (X-axis maximum travel, millimeters)
$131 = 200.000 (Y-axis maximum travel, millimeters)
$132 = 200.000 (Z-axis maximum travel, millimeters)

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[mactec54]

Hello everyone,
i'm on a testing stage on my hardware for a diy cnc mill.
I'm facing some issues connecting my end-switches to the cnc shield.I have to say that they used to work last week, but now no way to have them working.
I have cnc shield connected to external driver.
I attach the cabling and the grbl settings, maybe someone can point me in the right direction.
And also how can i check with a tester if the end switch pins are ok or damaged?
Thanks alot and sorry for my bad english:-)
Carlo

$0 = 25 (Step pulse time, microseconds)
$1 = 25 (Step idle delay, milliseconds)
$2 = 0 (Step pulse invert, mask)
$3 = 0 (Step direction invert, mask)
$4 = 0 (Invert step enable pin, boolean)
$5 = 0 (Invert limit pins, boolean)
$6 = 0 (Invert probe pin, boolean)
$10 = 3 (Status report options, mask)
$11 = 0.010 (Junction deviation, millimeters)
$12 = 0.002 (Arc tolerance, millimeters)
$13 = 0 (Report in inches, boolean)
$20 = 0 (Soft limits enable, boolean)
$21 = 1 (Hard limits enable, boolean)
$22 = 1 (Homing cycle enable, boolean)
$23 = 7 (Homing direction invert, mask)
$24 = 25.000 (Homing locate feed rate, mm/min)
$25 = 500.000 (Homing search seek rate, mm/min)
$26 = 250 (Homing switch debounce delay, milliseconds)
$27 = 1.000 (Homing switch pull-off distance, millimeters)
$30 = 1000 (Maximum spindle speed, RPM)
$31 = 0 (Minimum spindle speed, RPM)
$32 = 0 (Laser-mode enable, boolean)
$100 = 250.000 (X-axis travel resolution, step/mm)
$101 = 250.000 (Y-axis travel resolution, step/mm)
$102 = 402.000 (Z-axis travel resolution, step/mm)
$110 = 800.000 (X-axis maximum rate, mm/min)
$111 = 500.000 (Y-axis maximum rate, mm/min)
$112 = 800.000 (Z-axis maximum rate, mm/min)
$120 = 10.000 (X-axis acceleration, mm/sec^2)
$121 = 10.000 (Y-axis acceleration, mm/sec^2)
$122 = 10.000 (Z-axis acceleration, mm/sec^2)
$130 = 200.000 (X-axis maximum travel, millimeters)
$131 = 200.000 (Y-axis maximum travel, millimeters)
$132 = 200.000 (Z-axis maximum travel, millimeters)

A Cable Shield can only be clamped to a Ground Plane, which is the Metal Cabinet or the Metal panel that everything is mounted on or the Grounded machine frame which would be Ground Bonded to the electrical Cabinet

A Shield must be clamped where or near the end of the cable

[carlob]

Thanks for the reply!
I did check that and if i get it right one of the two pins, for each end switch on the cnc shield, is the ground.
In theory if i plug two wires in the x+ pins and make them touch together the end-switch alarm should trig.But nothing append.
One other weird thing is that when i plug the red wire of the switch to the 5v pin(this should be the way to make the led of the switch working) i can't conect the arduino board to the pc, looks like it goes to block or something.
I'm waiting for a new cnc shield to check if this one is faulty.
C.

[carlob]

*UPDATE*
In the cnc shield v3.0 the z limitt switch pins are on the SpnEn pin due to a chage on the arduino side.
If i connect the z limit switch to the SpnEn pins it works as expected, but still not working on other axis.
Strange bbut maybe is a clue.

[mactec54]

Thanks for the reply!
I did check that and if i get it right one of the two pins, for each end switch on the cnc shield, is the ground.
In theory if i plug two wires in the x+ pins and make them touch together the end-switch alarm should trig.But nothing append.
One other weird thing is that when i plug the red wire of the switch to the 5v pin(this should be the way to make the led of the switch working) i can't conect the arduino board to the pc, looks like it goes to block or something.
I'm waiting for a new cnc shield to check if this one is faulty.
C.

Sorry I thought you were using a shielded cable, the Arduino shield is very different beast, most likely has failed if it was working

[carlob]

After further investigations i found out that those pins on the shield( limit-switch pins x+ x-y+ y- z+ z-) output just 0.3v while the one is workig is near 5v(4.75v), and also checked on the arduino board itself, and there pins 10,11,12 all output low voltage while i suppose they should output 5v.I'm i right?
Anything i can do apart buy a new one?
Thanks alot!
C.

[mactec54]

After further investigations i found out that those pins on the shield( limit-switch pins x+ x-y+ y- z+ z-) output just 0.3v while the one is workig is near 5v(4.75v), and also checked on the arduino board itself, and there pins 10,11,12 all output low voltage while i suppose they should output 5v.I'm i right?
Anything i can do apart buy a new one?
Thanks alot!
C.

Yes, they would need to be 5v, is the boards inputs output opto isolated as it would need to be to protect against and switching spikes

[carlob]

Hello,
i have solved this with a new arduio one board, just tested and all end switches works properly, so i think the old arduino board was faulty.
Can you explain how to protect from spikes?so i won't damage the new one:-)
The switch is this onne: https://www.amazon.it/GTIWUNG-Fineco...s%2C112&sr=8-9

Attached to the cnc shield v3.0

Thanks alot!!

[mactec54]

Hello,
i have solved this with a new arduio one board, just tested and all end switches works properly, so i think the old arduino board was faulty.
Can you explain how to protect from spikes?so i won't damage the new one:-)
The switch is this onne: https://www.amazon.it/GTIWUNG-Fineco...s%2C112&sr=8-9

Attached to the cnc shield v3.0

Thanks alot!!

You could add an opto isolation board, does the Arduino board have the inputs opto isolated, if not then you would need an opto isolation board

[carlob]

You mean somethinng like this?
https://www.amazon.it/ARCELI-isolame...7M78S8LB&psc=1

[mactec54]

You mean somethinng like this?
https://www.amazon.it/ARCELI-isolame...7M78S8LB&psc=1

I can't open your link it just when to Amazon, with no opto Board, this is what you need for opto isolation or something like it.