One-wire is super easy. You only really need messages sent when changes occur. The downfall is it is half-duplex. That being said you are basically running half-duplex now.
The reason I suggested CAN is because it is similar to RS-485 in that it uses two wires. You then have a full duplex network.
http://www.interfacebus.com/Design_Connector_CAN.html
BTW what type of container did you use for each node?




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