A friend of me wanted to know if there is a 24 volt version, or 'clone' of arduino
Because 24 volt is often used in the industrial sensors, he works with.
Operating at 24 volt, having 24v analog input, and able to switch (relays?) based upon 24 volt.
For him its important that the board is ready to use, without soldering resistors zenerdiodes etc.
I do not know if something like it exist so i ask it here, or maybe there is board for handeling higher voltages (for pinout and analog read) ?
No, not really. The chip itself can only run at 5V (6V maximum). However I did see an arduino variant that was hardened for 12V -- http://ruggedcircuits.com/html/mb324p.html
It's conceivable one could design an Arduino with all the various I/O ports gated in such a way that they interface with 24V, using level shifters or voltage dividers (e.g. for analog inputs) but I've not heard of one already designed for this purpose.
Virtually all "digital electronics" are 5V or 3.3V. But of course there are relatively simple ways to interface with higher-voltage circuits, just as you can use a 12V or 24V relay to switch 120/240VAC.
If you have some kind if 24V industrial control board, there is a good chance that there is a 5V voltage regulator and some 5V logic on the board.
Im pretty sure things wouldn't fly well if the boss found out the 10,000$ ... PLC was replaced with a 30$ arduino
although that would be pretty funny
maybe you can design your own board for 24v use, probably have some people interested in buying it
hm he didnt mention plc, i dont know what he uses.
I believe plc's are popular, i never seen one lol.
So creating something like it might be quite cool, and make the arduno adopted by more people
i hope it wont upset people who use plc's.
Maybe i should convince him to make it, before this he used to work for a big electronic company, he has the knowledge to create it i'm sure.
Have a look at the RuggedDuino
http://ruggedcircuits.com/html/ruggeduino.html
It should be good to 24v.
Rob
I've programmed plcs a little bit in class, and its easier to a degree, all graphical interface with simple lader diagram type form
personally I prefer the arduino, it would be cool but plcs usually come with expandable modules so technically it would be more about the input/output modules than anything
you could probably hook an arduino to an existing plc setup, once you figure out how the modules communicate
once you figure out how the modules communicate
Probably Modbus, Profibus or similar.
Rob
@Rob it sounds like you already used arduino with PLC combinations, what's your view on it ? do you prefer it or ... ?
PLCs are sold on ruggedness and reliability - they are bombproof, they will work next to an arc welder at high temperatures without a murmur etc etc. If you need something to work in that sort of environment they are worth it I guess. for less stringent requirements you don't need the 24V stuff at all - that gives the extreme immunity to electrical noise and to poor ground matching.
I worked in the building control game years ago but we made all our own custom hardware, so I have no direct experience with PLCs.
I'm now continuing that tradition by designing my own set of monitoring and controlling devices but that's another story.
Bottom line is that I think commercial PLCs are overkill for the average Arduinoite's project, but standard Arduinos and shields are not really up to the job of robust control.
Rob
hmm its kinda strange,
You see computers at industrial workfloors (who are way more sensitive)
Yet people put question marks at replacing arduino for a plc.
In the end i think it comes down to proper electronics and shielding; and that could be done with any good circuits i think.
Best would be decoupled circuits / optical / relays /etc..
But its not up to me to change industries, dough i would assume its do able.
And perhaps they will if they start to realize it.
perhaps a nextgen project
This Mega from Freetronics has a switching power supply, and is advertised to handle up to 28v.
I don't think its a matter of possibility more of reliability, and the fact that say an allen bradley plc has a multimillion dollar company behind it with tech support and many engineers to figure out bugs
and arduino that a hobbyist designs can most likely do anything a professional plc can but there's no garuntee that something wasn't overlooked or some bug that would come out later in operation, and then there's no one around to ask for help( other than this amazing forum, which would be amusing to see some industrial companies asking for hobbyist help)
Well once Linux was for hobbyists too,
People bring and help with their different knowledge expertise and at some boiling point, there is a turn.
Suddenly a massive group of enthusiast role a dice against some commercial products.
I have seen this so often in software, (and i think rep rap, is another hardware example for this)
I think those free spirits, often create products that commercial people dont feel a need to create.
As they rather like to protect their market.
(i see now 2 posts of 24volt arduino in this blog, so i think such tipping points are near)
Who knows, maybe arduino will become the small business plc of choice, it probably already is actually, due to how cheap and easy it is
I don't think there will be that 24v turn until more "open source" companies exist, when the development board and ide is all open source based, there wont be competition as to who has the 30,000$ system and the 30$ system, as the 30$ is simple enough for the single employee/boss of the small business to do everything him/herself without the need of tons of education, certificates, and starting money
then that 24v standard wont mean much because the involved people don't need everything 24v to use it, rather useing what they can get
If I really wanted( as well as a large portion of this forum), a 24v board can be made easily and probably not too expensive, modeled after todays plc's with expandable hardware, but only if there was such a market that needed it
however like most projects on here 5v is plenty enough control logic, if anything leaning towards the lower voltages needed for portable uses and personal project, so a basic arduino will fill the majority of peoples needs, hence the lack of that 24v version