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cheap Arduino based programmable logic controller
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universal-solder:
Just want to spread the word:

We released another Arduino based PLC DIY kit, with 8 inputs and 10 outputs, analog/digital, with RTC on board, powered by an Arduino NANO V3.

The module size is 100 x 80 mm, and it requires 12V DC power supply and a CR2032 backup battery for the RTC.

And it is a lot cheaper than you would expect  :-+

https://www.universal-solder.ca/product/canaduino-plc-mega328-programmable-logic-controller-electronics-diy-kit-for-arduino-nano-included

Or see the documentation here:
Doctorandus_P:
Meh, check out the FN2 clones on Ali / Ebay / China.
Nice PCB with lots of optocouplers, an SMPS with industrial looking Common mode chokes, plenty of transistors or Relay outputs, and an easily programmable STM32 so you can use normal C++ instead of the *&^%$#@! ladder logic or whatever.
Boards range from EUR15 to EUR35 depending on options such as number of I/O and casing for DIN rails, etc.

[Edit] Oops, correction. I think it's FX2N. Ali is full of these boards, but I am disliking Ali because they are doing difficult for letting me find anything there without logging in. On Ebay these closes seem harder to find.
Circlotron:

--- Quote from: Doctorandus_P on March 25, 2020, 10:39:32 pm ---and an easily programmable STM32 so you can use normal C++ instead of the *&^%$#@! ladder logic or whatever.

--- End quote ---
That's all fine and good if you understand C and it's variations, but if you're already into PLCs then this might be easier to get up and running.  FWIW I'm not familiar with either.  .asm for me!
universal-solder:
The Chinese PLCs are for a different audience. Our kits are made for hobbyists, enjoying soldering a PCB, and maybe have some experience programming an Arduino. And even without any programming knowledge, there is Mitov's "Visuino", a simple but powerful visual editor.

We used one of our PLCs for garden watering last year, measuring soil moisture, precipitation and temperature on different patches, and controlled 5 watering zones. In the office we use one to scroll through different light scenes by pressing only 1 button several times, or holding it to dim the lights up and down.

Of course, you can buy all of this plug and play in a plastic box on Amazon. But this is not our market.
bd139:

--- Quote from: Doctorandus_P on March 25, 2020, 10:39:32 pm ---Meh, check out the FN2 clones on Ali / Ebay / China.
Nice PCB with lots of optocouplers, an SMPS with industrial looking Common mode chokes, plenty of transistors or Relay outputs, and an easily programmable STM32 so you can use normal C++ instead of the *&^%$#@! ladder logic or whatever.
Boards range from EUR15 to EUR35 depending on options such as number of I/O and casing for DIN rails, etc.

[Edit] Oops, correction. I think it's FX2N. Ali is full of these boards, but I am disliking Ali because they are doing difficult for letting me find anything there without logging in. On Ebay these closes seem harder to find.

--- End quote ---

Just tripped over this comment. Holy crap those are cheap. $17 inc shipping or slightly more if you want an enclosure with a DIN rail mount (!). https://www.aliexpress.com/item/32894331223.html ... and yes they support ladder logic. See the body comment.

I need to build something non critical soon that I was going to fish out for an Eaton unit for. Ladder logic is fine for my requirements on that but just as a point they expose ST Link on the header by the looks if you must do something C related (wholly unnecessary for me). Looks like core is STM32F103.
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