Since the transmitter will be used only very infrequently, just use a 9V block battery or 6/12V cylinder cell to power it.
Those 433 MHz transmitter modules draw no current when not triggered (when the DATA input is LOW).
Since the transmitter will be used only very infrequently, just use a 9V block battery or 6/12V cylinder cell to power it.
Those 433 MHz transmitter modules draw no current when not triggered (when the DATA input is LOW).