ESP32-S2 WROOM Module

Overview

The ESP32-S2 WROOM is Espressif's compact WiFi module built on the ESP32-S2 SoC — a single-core Xtensa LX7 processor running at up to 240MHz. Unlike the dual-core ESP32, the ESP32-S2 trades one CPU core for native USB OTG 1.1 support and improved security features, making it well-suited for USB-connected IoT devices, USB HID gadgets, and applications where Bluetooth is not required.

The module integrates 4MB of SPI flash, 320KB SRAM, 128KB ROM, 16KB RTC SRAM, and a built-in PCB antenna in an 18×31×3.3mm package. Operating at 3.0–3.6V, the ESP32-S2 is not 5V-tolerant and requires level shifting when interfacing with 5V devices. It includes a rich peripheral set: SPI (×4), I2C (×2), I2S (×2), UART (×2), 43 GPIO, ADC (×2, 20 channels), DAC (×2), touch sensors (×14), PWM, USB OTG 1.1, IR, SDIO, and more.

The ESP32-S2 WROOM module is intended for integration into custom PCB designs rather than breadboard prototyping — it requires surface-mount soldering of the castellated pads. FCC/CE/SRRC certifications are included with the WROOM module form factor. The ESP32-S2 is supported by the Arduino framework, ESP-IDF, CircuitPython, and MicroPython.