Datasheet

monitor the battery voltage to detect when you need a recharge.

Here's some handy specs! Like all Feather 32u4's you get:

Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in

Light as a (large?) feather - 5.5 grams

ATmega32u4 @ 8MHz with 3.3V logic/power

3.3V regulator with 500mA peak current output

USB native support, comes with USB bootloader and serial port debugging

You also get tons of pins - 20 GPIO pins

Hardware Serial, hardware I2C, hardware SPI support

7 x PWM pins

10 x analog inputs

Built in 100mA lipoly charger with charging status indicator LED

Pin #13 red LED for general purpose blinking

Power/enable pin

4 mounting holes

Reset button

The Feather 32u4 Radio uses the extra space left over to add an RFM69HCW 433 or 868/915 MHz radio module.

These radios are not good for transmitting audio or video, but they do work quite well for small data packet

transmission when you ned more range than 2.4 GHz (BT, BLE, WiFi, ZigBee)

SX1231 based module with SPI interface

Packet radio with ready-to-go Arduino libraries

Uses the amateur or license-free ISM bands (https://adafru.it/mOE): 433MHz is ITU "Europe" license-free ISM or

ITU "American" amateur with limitations. 900MHz is license-free ISM for ITU "Americas"

+13 to +20 dBm up to 100 mW Power Output Capability (power output selectable in software)

Create multipoint networks with individual node addresses

Encrypted packet engine with AES-128

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

module

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