I am thinking of ways to connect a network of nodes together [small Arduino pcbs] using the RS485 buss, and wonder if there are any obvious problems with using standard USB cables for this. The nodes might be 10-30 feet apart, and only one [the host] might be powered directly, and with all the others drawing their power off the daisy-chained USB cables.
Each pcb would have 2 small USB receptacles for daisy-chaining, and with the assumption that the total current load would not be excessively high, ie less than say, 1 Amp. The raw unregulated power, approx 6-7VDC, would be passed down the cable, with local v.regs on the pcbs.
I notice USB cables typically have twisted shielded pair for the D-lines. Any obvious problems I'm not seeing here? It seems the alternative is to jin up some sort of connections using raw dual twisted-pair cable.