The bluetooth shields that I linked to only require two pins, TX and RX.
Thats a more sophisticated way of doing it, but what I suggest needs just one pin each end , and doesn't need a shield.
I am paying less than $3 for a pair of wireless modules.
The bluetooth shields that I linked to only require two pins, TX and RX.
Thats a more sophisticated way of doing it, but what I suggest needs just one pin each end , and doesn't need a shield.
I am paying less than $3 for a pair of wireless modules.