3.3v Limit Switches and Pump on Gas Laser

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silver2row
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3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello,

A while back is when I inquired about some odd wiring issues w/ the PSU outside of the AcornCNC. First off, are there any 3.3v lines for limit switch logic (four wire) and if not, are there some ideas going around about how to incorporate this type of limit switch?

I have a three wire pump also. It feeds water throughout the gas laser core to cool the tube.

The three wire pump, of course it is generic (everything on this machine is generic or from Who-Blah), seems to have a GND, 5v, and 3.3v logic on/off.

Issues so far, I have no way to tell if the machine is going to be operational w/ the 5v from the AcornCNC.

I have 5v out on my PSU and from the AcornCNC. Good news there! But!

1. Should I use or try first to see if a logic level converter would prove useful in my situation?
2. Is there a way to tap 3.3v logic from the AcornCNC to my limit switches and/or pump.

Seth

P.S. Things are going well on the build so far, i.e. outside of the 3.3v logic needs. Um, I guess logic level converter it is for me...

Oh...any feedback is good feedback!

I have some photos of the wires that lead to the two limit switches, the pump in question (although the wiring is not seen), and one of the limit switches.
PXL_20230329_062627638.jpg
Tiny Pump (Three Wire)
PXL_20230329_062711108.jpg
Tiny Limit Switch (Four Wire)
PXL_20230329_062721215.jpg
Four wires * 2 (limit switch wires)
tblough
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by tblough »

Acorn does not use 3.3v so you will need another power supply or a DC-DC converter to generate it. However, there is a reason that industrial tools usually use 24VDC or 24VAC for signalling. There is a significant amount if electrical noise in machine tools and 3.3V is below the "noise floor".

If you are in a noisy room, you need to shout to be heard.
Cheers,

Tom
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I have CDO. It's like OCD, but the letters are where they should be.
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello @tblough,

Okay. I may be mistaken...I need to make sure but I am unassured so far how I can test this use case. I will just power them w/ 5v, i.e. you are most likely correct in this circumstance.

The reason being, the reason I think you are right, is that there was a "step up" card associated w/ the Stellaris (I think). I am doing many years of work and packing it into guess work on my end w/out schematics and/or wiring diagrams. It seems it would be easy but it has been a task so far.

Seth

P.S. Maybe the logic is 5v. Hmm...I never really thought about it. I just wanted to make sure it was not 3.3v since there are other electronics that need to be incorporated.
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello Again Everyone,

I have been reading some schematics produced by you guys/gals. Anyway, I see some of the limit switches need to be put in parallel or series.

Is there a way I can use the limit switches w/out having them put in parallel or series?

Seth
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by ShawnM »

Yes, you wire each switch to its own input on the Acorn board. This uses a lot of inputs this way so if you run out you need the expansion board. Are they mechanical or proximity switches?
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello,

These limit switches are optical switches.

Seth
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by cnckeith »

page 10 shows individual limit switch wiring on ether1616, same for Acorn (24 volt), Note: Ehter1616 can be 5,12, or 24.
https://www.centroidcnc.com/centroid_di ... _guide.pdf
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello,

Okay. Thank you guys. I will try to use the 5v accordingly.

Seth
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Just to Rehash Older, General Ideas Here,

I found out that even at 5v, I need to take some precautionary measures handling the emitter and collector on the bot in question.

https://www.ttelectronics.com/TTElectro ... ronics.pdf

That .pdf online at ttelectronics is a good all around set up of ideas for using the OPB830W5Z which I am using for an older design.

Also, the ideas in that .pdf gives me more than enough to build around the already glued in optoelectronics. Phew.

Seth

P.S. I am still building here, i.e. so to take extra precautions w/ the wiring and electronics so to not have accidental issues.
silver2row
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Re: 3.3v Limit Switches and Pump on Gas Laser

Post by silver2row »

Hello Again,

So far, nothing. But! I have a couple questions:

1. I have four Lines for AC/DC but the four lines in this instance are for powering the PSU that will power some of the electronics and control the Gas Laser.
2. There are two Grounds for some reason. I have figured out that the Grounds/GNDs are for an E-Stop directly attached to the housing of the Laser Box and the input of the AC to the Laser Box.
3. I wanted to attach the AC to this house to test the rest of the Electronics, e.g. 3.3v, 5v, and so on...

If I was to wire the AC GND of my input w/out E-Stop, would I use (and this is just for testing that what they say is correct) FG in the photo or L- near the right side of the photo?

I understand a lot but little in this effort so far.

Seth

P.S. Here is the photo:
l.jpg
If you see my issue, please recommend a way to test further before actually blindly plugging in and not knowing anything...FG is ground and so is L- and thus the issue so far.
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