I’m a huge fan of Arduino, JeeNode, ESP8266. A few of them connected in a network is one of the best solutions to distribute sensors data, relays command and status, LCDs and so on. But what should we use for networking the nodes? Wifi is built into the ESP8266 so that’s a no-brainer. JeeNode has an RF12b working on 868Mhz, but what if you don’t want to use wireless? What if you want to use wired sensors and supply power to them over the same wire? I have looked at RS232 and Ethernet. RS232 is low cost but in its standard form best suited for point to point connections. Ethernet is much better, Ethernet Cards and libraries are easily available for the Arduino. Cost wise, it’s not the best solution, though.
RS485 | Node Network
