Adafruit ESP32-S2 Feather with w.FL Antenna

Overview

The Adafruit ESP32-S2 Feather with w.FL Antenna is a variant of the standard ESP32-S2 Feather that replaces the onboard PCB trace antenna with a w.FL (MHF4) miniature coaxial connector. This enables connection of an external antenna for significantly improved WiFi range in environments where the built-in antenna falls short — through walls, in metal enclosures, or across larger spaces. Beyond the antenna, the board is identical to the standard ESP32-S2 Feather.

At the heart of the board is the ESP32-S2 single-core Xtensa LX7 running at up to 240MHz. Unlike the dual-core ESP32, the S2 variant omits Bluetooth entirely but adds native USB — the USB-C connector connects directly to the ESP32-S2's built-in USB peripheral, enabling keyboard, mouse, MIDI, and mass-storage emulation without a UART bridge chip. This makes it particularly well-suited for USB HID and CDC applications.

The board includes 4MB of SPI flash and 2MB of PSRAM for expanded memory, a STEMMA QT I2C connector for plug-and-play sensor integration, and built-in LiPoly battery charging with a JST-PH 2-pin connector. In deep sleep the board consumes only 80–100µA, making it suitable for battery-powered sensor nodes that wake periodically to transmit data. The Feather form factor ensures compatibility with the wide range of FeatherWing add-on boards.

The ESP32-S2 Feather supports Arduino, CircuitPython, and ESP-IDF development. Adafruit provides extensive learning guides, and CircuitPython ships pre-installed, enabling immediate development without any additional toolchain setup.