NC limit switches : Where to pick the 5V?

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Typo
Posts: 8
Joined: Tue Feb 21, 2017 9:43 pm

NC limit switches : Where to pick the 5V?

Post by Typo » Mon Feb 18, 2019 10:37 pm

Hi all,

I have been using the version 2.58 since the build of my machine 2 years ago and I'm now in the process of upgrading the system.
Last week I added the connections to control my splindle and it works very well.
I'm now about to connect the limit switches but I'm facing what looks to me as a problem but might just a lack of finding the solution in the forum.

I'll use NC PNP type inductive sensors through an optocoupler (PC817).
So basically the output of the PC817 will be my limit switch.
As they are NC switches I'll set $5=1, disable the integrated pull-up resistor and use an external pull-down resistor.
My problem is the following : Where can I pick the 5V?
Should I use the 5V (Yellow circle in the picture?)
Or can I do anything with the pins in the blue rectangle? (I thought they might be places to solder jumper wire to switch)

I hope I won't be bothering you with an already asked question.

Best regards,
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Bertus Kruger
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Re: NC limit switches : Where to pick the 5V?

Post by Bertus Kruger » Tue Mar 12, 2019 6:53 pm

The yellow pins will be fine. Just don't drain to much current from it cause its powered by the RPI regulator

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