Hello Experts and Arduino enthusiasts,
I need to create a wired sensor network in which there are 10 nodes, Each node is about 1 Km away from the next one so they need to be connected in bus topology where first node is 9 km away from the last node. I am looking for recommendations on which type of communication protocol to use for this particular application. I already have network cable CAT 6 running from one node to next.
Thanks in advance and looking forward for responses.
RS485 is made for long distance wired communication.
Communication protocol at which layer?
Over such a long distance you're going to have to deal with problelms like nearby lightning strikes and ground differences. Does it have to be a wired network? LoRa is pretty much made for situations like this.
I moved your topic to an appropriate forum category @irnustian.
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Thanks in advance for your cooperation.
Ethernet is good for 100m, maybe a bit more if you don't mind some degradation.
What are you using for carrying data?
Fibre would be better.
RS485 Maximum Bus Length 1200m (at 100 kb/s). This would work, CAN will go a little further and would be more robust. I am assuming each node reads the incoming data and then sends it up stream to the next node. How do you plan on powering these nodes? Maximum continuous current per cat 5 conductor (at 25°C) 1.5 A Its D.C. resistance conductor < 14.5 Ω/100m and Maximum operating voltage (for all temperatures cable is intended to be used) 72 V dc. This link has more information: on the cable: https://www.farnell.com/datasheets/1311844.pdf
You can check this link: https://www.buzzupbattery.com/rs485-vs-can-a-protocol-comparison/
@irnustian
Two single-mode FibreOptic MODEM (and the fibre cable) for your many-kM (10km? 30km?) long-haul. Connect the network side of the FOM to the local network just like wired MODEMs at home and work.
I agree with the fiber but he has the cat 5 already installed and no idea of how it will be powered, I think he will try to power through the Cat 5 wire.
what microcontrollers are you using?
LoRa modules are cheap and designed to communicate over long distances (use a good quality external antenna) - note the frequencies-by-country
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