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Old 11-02-2020, 05:35 AM   #161
stj
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Default Re: Remote pump control ideas.

instead of the optocoupler you could use a darlington driver like a ULN2803
https://www.ti.com/product/ULN2803A

these have been used in gambling machines for a couple of decades to link the computer i/o to things like stepper motors and relays.

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Old 11-02-2020, 05:40 AM   #162
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Default Re: Remote pump control ideas.

Interesting. Dumb question, but does it provide any isolation so the MCU doesn't get zapped in any way ? The optocoupler is straightforward: there's physically no way electricity can jump the gap between the phototransistor and the LED (unless it's ridiculously high and it arcs)...bare with me, I'm learning here
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Old 11-02-2020, 09:51 AM   #163
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Default Re: Remote pump control ideas.

i'm suggesting the 2803 for outputs
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Old 11-02-2020, 10:36 AM   #164
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Default Re: Remote pump control ideas.

Yes, outputs can still experience spikes feeding into them, can't they ? That's why I was asking about physically separating the power box from the control box.
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Old 11-02-2020, 01:03 PM   #165
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Default Re: Remote pump control ideas.

dont overthink it - a common ground will exist
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Old 11-02-2020, 11:46 PM   #166
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Default Re: Remote pump control ideas.

Quote:
Originally Posted by stj View Post
dont overthink it - a common ground will exist
Correct, but you know me....I like over-engineering stuff......which is why my projects take so long and I'm not a good designer
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Old 11-03-2020, 02:39 PM   #167
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Default Re: Remote pump control ideas.

I left the project running in the shop to see how it goes overnight...*insert jokes about fire and other disasters here*

Putting this particular project aside for now, what are some (more or less) ready-made systems that one can use to get into industrial automation, particularly noobs like yours truly here ? I mean, what I did here was build my own system, my own way, the way I saw it in my little brain It's certainly not suitable for anything else and is far from being a "solution". When I think of a more ready-made solution I think of the many "home automation" platforms for the RaspberryPi. These might also work in a pinch and are a huge step up from writing your own "bare-metal" code like I did (plus it has a ton of other features, like a GUI which my system lacks entirely and I AM aware of it) but even those can't really be taken seriously in an industrial setting, can they ?

Proper industrial automation probably involves special hardware and software which costs thousands, so let's exclude those entirely and focus on the more affordable solutions which a small company wishing to enter this field could invest in...

I suppose the general consensus is that it depends on the application....
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