I'm gonna start a new project where i want to connect multiple arduinos in the same bus line. I know that with SPI you can do that, connecting the miso from one to the mosi of another, etc (so, 4 cables) or we can use multiple SS cables for each arduino (depends of the amount of arduinos connected).
My question is: is there any way possible of connecting the arduinos with tx-rx so all of them are listening to the bus and the master sends a signal with an ID? So, just the arduino that recognizes that ID will send data back to the master and all of the others stop listening to the bus?
Is it best to use half or full duplex communication?