Home Switch Problem

[m_c]

There should be voltage at the switch, which makes me think you've not got the board powered correctly.

What power supply do you have connected to the board?
And do you have a link to any kind of manual for the board?

[john swift]

yes ,
you should measure a voltage across an open limit switch wires

about 4V if the input circuit has a 5V supply



John

PS
a photo of the breakout boards supply terminals will be usefull wth
a diagram of the breakout boards supply connections

[Kev2960]

Would it be best to get another bob rather than messing around with this one, which doesn't seem to be much good

[Clive S]

Would it be best to get another bob rather than messing around with this one, which doesn't seem to be much good

As have been said do you have the manual. Also doe this bob require two power supplies I say this because I do have a Chinese one that is powered by usb BUT the inputs won't work unless the other power supply (12-24V) is connected as the bob gives out the 0-10V for speed ref. Just a thought.

[Kev2960]

Thanks John I appreciate you doing all this,
Kev

[Kev2960]

Hi John, I think I'm going to replace my bob with an upgrade. What would you recomend ?
Kev

[john swift]

Hi Kev

I'm not sure what to recomend

I was going to recomend CNC4PC's C10 breakout board
but looking at their web site they have changed the construction

the versions I had seen had the IC's in sockets
making it easy to repair if something went wrong


the latest version is like this


this chinese BOB others have had problems with
I have reverse engineered to find out why it didn't work as I expected
it turns out that the 74hc14 IC used to buffer the inputs doesn't have the supply pin connected !!!!


in a quick web search this is the closest to your BOB I have found ( may need an extra power supply)


boards like this with opto isolated outputs are not ideal when the stepper drivers have opto isolated inputs


breakout boards with LED indicators on the inputs could be an advantage
at least you can see when the switch is operated

low cost chinese board with LED input indicators


John
PS

from Australia
this MB02 from Homann Designs is a possible alternative to CNC4PC's C10

[Kev2960]

Hi John, I bought a bob a while ago from ebay, it looks very similar to the one in your photo, but i've never used it because someone told me it wouldn't work with my drivers, or steppers, can't quite remember which. Is that true ?

[m_c]

Personally, I'd try fixing the one you have first.
It seems to be a reasonable spec, in that it uses 24V inputs, which is far better than using 5V which most BOBs do.

It's most likely something simple, so if you can get a photo of the underside, we should be able to workout the area of the problem.

[john swift]

Hi Kev

thats the board with a problem with the missing positive supply to the input circuit



what stepper drivers do you have ?

John