Here is what I need to do:I need to connect 2 arduinos using 4 wires. Easy, right? The tricky part is that they need to communicate despite the way these 4 wires are connected. Let me explain:4 I/O pins on one arduino will be connected to 4 I/O pins on the other arduino, but the communication MUST be possible even if we interchange the connections.Is this possible? I could add a 5th wire for common ground but it would actually be best if one of the wires could act as ground (even though it is not known which one). Does it make sense? Do you guys think it can be done?
but the communication MUST be possible even if we interchange the connections.