# Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500) > ARM Cortex-M0+ Feather board with ATWINC1500 802.11 b/g/n WiFi, 256KB flash, 32KB RAM, 10 analog inputs, and built-in LiPo charger. FCC-certified WiFi for IoT and connected projects. ## Quick Facts - **Brand:** Adafruit - **Board Type:** dev-board - **Price:** ~$39.95 - **Product Readiness:** developer - **CPU:** ATSAMD21G18 ARM Cortex-M0+ @ 48 MHz - **CPU Architecture:** ARM Cortex-M0+ - **CPU Cores:** 1 - **RAM:** 32KB SRAM - **Flash:** 256KB - **Power:** 5V + LiPo - **Operating Voltage:** 3.3V - **Dimensions:** 53.65 × 22.8 × 8 mm - **Weight:** 6.1g - **Antenna:** Built-in PCB antenna ## Connectivity - **Wifi:** 802.11 b/g/n ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** Yes ## Compatible Firmware arduino ## Use Cases - iot - iot-sensor-node - prototyping - smart-home ## Components - **ATSAMD21G18** (mcu): ARM Cortex-M0+ at 48MHz, 256KB flash, 32KB SRAM, native USB. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn-learn.adafruit.com%2Fsystem%2Fassets%2Fassets%2F000%2F030%2F130%2Foriginal%2Fatmel-42181-sam-d21_datasheet.pdf&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) - **ATWINC1500** (wifi-module): FCC-certified 802.11b/g/n WiFi module with SSL/TLS 1.2 support, controlled via SPI. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.microchip.com%2Fen-us%2Fproduct%2Fatwinc1500&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) ## Protocols - **SPI**: MOSI: PA16, MISO: PA19, SCK: PA17 - **I2C**: SDA: PA22, SCL: PA23 - **UART**: TX: PA10, RX: PA11 - **802.11 b/g/n**: ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | PA11 | RX — UART Receive | UART | digital-input, digital-output | | PA10 | TX — UART Transmit | UART | digital-input, digital-output | | PA15 | D5 — GPIO / PWM | — | digital-input, digital-output, pwm | | PA20 | D6 — GPIO / PWM | — | digital-input, digital-output, pwm | | PA07 | D9 — GPIO / PWM / Analog | — | digital-input, digital-output, pwm, analog-input | | PA18 | D10 — GPIO / PWM | — | digital-input, digital-output, pwm | | PA16 | D11 — SPI MOSI | SPI | digital-input, digital-output | | PA19 | D12 — SPI MISO | SPI | digital-input, digital-output | | PA17 | D13 — SPI SCK / LED | SPI | digital-input, digital-output | | PA22 | SDA — I2C Data | I2C | digital-input, digital-output | | PA23 | SCL — I2C Clock | I2C | digital-input, digital-output | | PA02 | A0 — Analog In / DAC Out | — | analog-input, analog-output | | PB08 | A1 — Analog In | — | analog-input | | PB09 | A2 — Analog In | — | analog-input | | PA04 | A3 — Analog In | — | analog-input | | PA05 | A4 — Analog In | — | analog-input | | PB02 | A5 — Analog In | — | analog-input | ## Description ## Overview The Adafruit Feather M0 WiFi pairs the ATSAMD21G18 ARM Cortex-M0+ microcontroller with Atmel's ATWINC1500 WiFi module on the standard Feather form factor. The ATWINC1500 is a FCC-certified 802.11b/g/n module that handles all RF operations independently, supports WEP/WPA/WPA2 security, and even offers SSL/TLS 1.2 for secure connections — all controlled via SPI from the SAMD21. Running at 48 MHz with 256KB of flash and 32KB of SRAM, the SAMD21 brings significantly more compute and memory than ATmega-based WiFi boards. It also provides native USB support — meaning it can enumerate as a keyboard, mouse, MIDI device, or serial port without any additional chip. The board integrates a 200mA LiPo charger, enabling fully wireless battery-powered operation. A built-in regulator provides 600mA at 3.3V, sufficient to power the WiFi module's 300mA peak draw during transmission bursts. The 10 analog inputs (12-bit ADC), 8 PWM channels, and hardware SPI/I2C/UART make it a capable platform for sensor-connected WiFi nodes. With Arduino IDE support via the Adafruit SAMD board package and the Adafruit_WINC1500 library, this board makes building WiFi-connected devices straightforward while retaining the flexibility of a full-featured development board. ## Where to Buy - [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F3010&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) — 39.95 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F3010&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fadafruit%2FAdafruit-Feather-M0-WiFi-WINC1500-PCB&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Flearn.adafruit.com%2Fadafruit-feather-m0-wifi-atwinc1500%2Foverview&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn-learn.adafruit.com%2Fsystem%2Fassets%2Fassets%2F000%2F030%2F130%2Foriginal%2Fatmel-42181-sam-d21_datasheet.pdf&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) - [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fcdn-learn.adafruit.com%2Fassets%2Fassets%2F000%2F032%2F983%2Fmedium800%2Ffeather_schem.png&ref=openhardware.directory&product=adafruit-feather-m0-wifi&source=md-export) ## Tags `feather`, `wifi`, `arm-cortex-m0`, `atsamd21`, `atwinc1500`, `iot`, `lipo-charger`, `adafruit` ## Images ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/a98fbff691b6.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/c6055277c38d.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/c5cc267edb6c.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/df3aa202c8da.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/cf0caaf889b3.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/86047ed878a8.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/f78e3849d089.jpg) ![Adafruit Feather M0 WiFi (ATSAMD21 + ATWINC1500)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-feather-m0-wifi/024746366d6d.jpg) --- [View full device page](https://openhardware.directory/devices/adafruit-feather-m0-wifi)