I have added a simple diagram I made. A few notes, I've changed output pin on diagram as 11 just for simplicity. As you can see in the first box I have 3 pairs of receivers/senders. My receivers each have their own inputs, in, while all the transmitters are connected to 1 pin, out. Then each input is connected to a digital pin(3, 5, 7, 11) along with my out. the power and gnd are connected to my motor driver in there respective places.