Limit switches PCB schematic verification.

[cncnoob]

I was really just looking to see if the PP was compatible in terms of ECP EPP etc? Not sure what comms Mach3 uses?!

Might have a look around some forums etc..


It looks like its a full PCI PP so I'm guessing it wont be an EMU..
Ma order it anyway as its so cheap, if it doesnt work at least I can return it ;D

[cncnoob]

Hi guys.

Could someone please kindly check over my schematic to make sure I'm not making any obvious mistakes?

I plan to run 24v from a mains adapter, and the 5v/GND is running from the PP.

I decided to go for a good quality relay opposed to an opto simply because it makes more sense to me now to go this route.


Thanks in advance!

[m_c]

It maybe makes more sense to you, but an opto with a suitable resistor (and zener if you want some extra protection) is far simpler. You can also add a capacitor across the opto if you want a simple hardware debounce.

But anyway, why D2? If it's a solid state relay, then you don't get any surges, so it's not doing anything.
Shouldn't R6 be connected directly to ground for quicker switching?
Fair enough a large capacitor over the input, but 100uF for C2 seems a bit excessive.
In fact, shouldn't R6 be tied to gnd to provide the voltage divider along with R1 and R2 for Q1?


It all seems a bit over complicated to me.

[cncnoob]

Thanks MC..

I was following a design for a relay originally which suggested the resistor R2 to be here..
It was originally for a realy, which I switched for an opto/SSR.

I've been working on this again today with a little help from another forum.

Not sure what value I should change up in terms of C2, any suggestions? I've changed it to a 50 for now..

This is the updated design (as of today..).