Turning serial connection on and off to save batttery, possible?

Hi,

While the UART is initialised automatically if D29/30 are connected, you can do it manually (on any pins) with Serial1.setup(9600,{rx:..., tx:...}) - and if you manually set the pin to do something else with digitalRead(rxpin);digitalRead(txpin) then that should automatically turn it off - saving power.