This is how I made an poor man’s RFLink. It cost me only about $4, this is when I count in basic parts I already had, Arduino Uno, bradboard and some pin headers (but who doesn’t have this stuff in their hobby shelf?😉)..
This is how I made an poor man’s RFLink. It cost me only about $4, this is when I count in basic parts I already had, Arduino Uno, bradboard and some pin headers (but who doesn’t have this stuff in their hobby shelf?😉)..