Best Hardware to connect two arduino unos, wired 100 feet apart.

Using Arduino Project Guidance
#1

I need to connect two arduino unos with a wired connection . What hardware would be the best for this. I need to control two relays on each end and send three sensor values back from the other end. Displays on each end. LAN running thru a switch?

Thanks for any input.

#2

Simple serial RS232; TTL might work too, depending on speed.

Current loop would work too.

Why not radio ?

#3

A bit long for RS232, but well within specs for RS485.

If you want a web interface, use an ESP8255 instead of an UNO.

#4

I'd likely use RS422/485 differential. Get yourself a couple of SN75179BDR (or equivalent) for full-duplex operation. Use some Cat5e cable (use twisted-pairs for each differential pair) and RJ45 jacks.

#5

Use 2 ESP8266's, ESPNOW, and give the Uno to a 10 year old who is interested in making sparks or donate it to a local STEM program.

#6

mwbmd11:
I need to connect two arduino unos with a wired connection .

Really?.
One of the better reasons not to use wireless is the absence of power at the other end. In that event Power Over Ethernet might be an option.

#7

And unless you have shields to match, the Nano is more practical, or the Pro Mini if you do not need to connect it to USB.

#8

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