Description
Feather is the new development board from Adafruit, designed to be thin, light, and portable. The Adafruit Feather 32u4 FONA combines an Arduino-compatible microcontroller with an audio, SMS, and data-capable cellular module, built-in USB and battery charging.
At its core, it features an ATmega32u4 clocked at 8 MHz with 3.3V logic, 32K of flash, 2K of RAM, and built-in USB for programming and debugging without the need for additional chips. It supports USB device functions like mouse, keyboard, and MIDI.
This board includes a connector for any 3.7V Lithium polymer battery (minimum 500mAh recommended for operation) with built-in battery charging through microUSB at 500mA.
Dimensions and specs:
- Measures 2.4″ x 0.9″ x 0.28″ (61mm x 23mm x 7mm)
- Weight: 8.2 grams
- ATmega32u4 @ 8MHz with 3.3V logic
- 3.3V regulator with 500mA peak output
- USB bootloader and serial debugging
- 20 GPIO pins, 7 PWM pins, 10 analog inputs
- Hardware Serial, I2C, and SPI support
- 500mA Lipoly charger with status LED
- Pin #13 red LED
- Power enable pin for 3.3V regulator
- 4 mounting holes and reset button
The cellular module is the SIM800 quad-band GSM module capable of:
- Global GSM 2G network coverage (850/900/1800/1900MHz)
- Voice calls with external speaker and microphone support
- SMS messaging
- GPRS data (TCP/IP, HTTP)
- FM radio broadcast reception
- AT command interface with auto-baud detection
- Bluetooth client interface with SPP and audio
Required accessories (not included):
- 2G Mini SIM card (T-Mobile or resellers recommended in USA)
- 500mAh or larger Lipoly battery
- MicroUSB cable for charging
- External antenna (slim sticker-type preferred) and necessary adapters
- External electret microphone and 8 Ohm speaker for calls
See the tutorial for schematics, usage instructions, and more.
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