Datasheet

ENable pin

If you'd like to turn off the 3.3V regulator, you can do that with the EN(able) pin. Simply tie this pin to Ground and it will

disable the 3V regulator. The BAT and USB pins will still be powered

Radio Power Draw

You can select the power output you want via software, more power equals more range but of course, uses more of

your battery.

For example, here is the Feather M0 with RFM69HCW set up for +20dBm power, transmitting a data payload of 20

bytes

The ~25mA quiescent current is the current draw for listening (~15mA) plus ~10mA for the microcontroller. This can be

#define VBATPIN A7

float measuredvbat = analogRead(VBATPIN);

measuredvbat *= 2; // we divided by 2, so multiply back

measuredvbat *= 3.3; // Multiply by 3.3V, our reference voltage

measuredvbat /= 1024; // convert to voltage

Serial.print("VBat: " ); Serial.println(measuredvbat);