Need a help again.

General CNC CNC Routers
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1

Need a help again.
When I pluh end stop swich ti arduino grbl shield, sometimes it works sometimes don’t.
But it works perfectly when i just plug on wire to X+ and just tuch it with finger.
Can some one explain me that ?

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2

it sounds as if you’d need to enable input pullup

3

Noise… there is a software debouncing available and you may enable it and then re-compile grbl firmware.

You may also change to NC switches, as this is more immune to noise issues.

4

it looks like finger thing stop working after debouncing enabled, but now end stops almost never working.
Whats about this input pullup, how do I enable it.
And what kind of NC switches,? any links on them ?

5

If you haven’t changed the source, the pull-ups are enabled. But in some environments they may not be enoguh, so a 330 ohm resistor between +5V and end-stop input pin (D9-D11) may help.

Please make sure you are using the type of switch expected (NO) Connecting Grbl · grbl/grbl Wiki · GitHub

But I do agree with @sszafran that NC (normally closed) switches will provide you better results.

6

So thats the switch i hawe. Red/Black - NO and Red/Green - NC
On my grbl shield is only ± for endstops, so I just get Green-/Red+ and send $5=1 to invert limit pins ?

And yes, I haven’t changed source except have enabled software debouncing.

So nex thing I got to buy is 330 omh resistors and some shielded wires.

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7

Opps, from the last picture I can see there is a led on your switch. I do not know what that is but is is definitely something more than a switch, so without a better knowledge on that circuit we cannot provide you a better insight. Please try with a regular switch, or just joining two wires (as a poor man’s switch) to diagnose your issue.

8

Yes, connecting two wires it was kind a working before I enabled software debouncing.
Here is a short video about this swich and some photos :slight_smile:
But in worst case I will just desolder swich from circuit board and plug it straight :slight_smile:

9

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11

I guess yours is this one http://www.thingiverse.com/thing:762

No need for pull-up, but you need three wires for it to work properly: GND, +5V and signal pin

12

Yes :frowning: and there is no signal pin for end stops where to connect in this board.
So probably will gonna have to use some simplified “poor mans” switch. :slight_smile:

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13

X+, Y+, Z+ are the signal pins

14

OK
So I have to apologize for my dumb head :smiley:
everything is working just fine.
I was just connecting it wrong :smiley:
instead of connecting like red/blue I was connecting like red/green

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15

I think its time for wire things up :slight_smile:
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16

try placing the wires touched to the chassis or ground.

17

Nice…