Datasheet

cost. It is not recommended, but technically possible:

Connect an external 3.3V power supply to the 3V and GND pins. Not recommended, this may cause

unexpected behavior and the EN pin will no longer. Also this doesn't provide power on BAT or USB and some

Feathers/Wings use those pins for high current usages. You may end up damaging your Feather.

Connect an external 5V power supply to the USB and GND pins. Not recommended, this may cause unexpected

behavior when plugging in the USB port because you will be back-powering the USB port, which

could

confuse

or damage your computer.

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 32u4 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

reduce to amost nothing with proper sleep modes and not putting the module in active listen mode!

Here is a transmit with radio.setPowerLevel(0) to set +5dBm power

https://learn.adafruit.com/adafruit-feather-32u4-radio-with-rfm69hcw-

module

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