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/diy/ - Do It Yourself

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756723 No.756723 [Reply] [Original]

I'm trying to set this up and need some help. I would like to place the sensor inside the controlled area, have it send values to the controller, then if values are less than specified amount, turn misting system on. I have the misting system and sensors, but need help finding some open-source controller/datalogger with a screen to run it through. If someone would know of one it would be greatly appreciated.

>> No.756805

What you're talking about is a microcontroller on a development board. You don't need to concern yourself with "open source" since you're writing the code yourself. Arduino is pretty popular with hobbyists right now. You may need to add some simple circuitry to connect your sensor and myster depending on what they are. There are also PLCs which are devices designed for automation projects like this, but that's a $300 or more piece of industrial computer equipment.

You probably don't even need to program anything to do this. A comparator and potentiometer is all the logic you need.

>> No.756808

>>756805
>You probably don't even need to program anything to do this. A comparator and potentiometer is all the logic you need.

He's going to need some sort of hysteresis in the system to keep it from jittering on and off when it's close to the trigger point.

Most practical/easiest way to do that would be two comparators (one low to turn it on and one high to turn it off) and a flip-flop. Also gives the benefit of easy adjustability.

This is, of course, assuming your sensor is giving you an analog value. If it's some kind of digital sensor module, yeah, you're going to need a microcontroller for that.

>> No.756871
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756871

>>756805
He could do it around a PIC for around 20 currencies. He'd need to get a bootloader for it, but after that's done all he needs is ldmicro which translates ladder logic to code native to the PIC

picture related.
I can post the schematics as well if you'd like

>> No.756872

>>756871
>He could do it around a PIC for around 20 currencies

Or...you know...any pair of opamps, an SR latch, and some passives for around 0.2 currencies.

>> No.756873

>>756872
I was mostly responding to the $300 PLC part of the comment.

But yes. You would be correct.