If you liked Wemos D1 mini ESP8266 board with stackable add-on boards, you’ll probably love Wemos/Lolin S2 Mini board with the same factor, but fitted with an ESP32-S2 single-core WIFi processor, and offering twice the number of I/Os.
The board comes with 4MB flash, 2MB PSRAM, a USB-C port for power and programming, as well as two 16 pin headers for GPIOs, ADC, DAC, and more.
- SoC – Espressif Systems ESP32-S2FN4R2 Xtensa single-core 32-bit LX7 microprocessor up to 240 MHz with 320 KB SRAM, 4MB Flash, 2MB PSRAM
- Expansion headers – 2x 16-pin headers with 27x IO, ADC, DAC, I2C, SPI, UART, USB OTG
- USB – 1x Type-C USB for 5V power and programming
- Misc – Reset button and button 0 also used to enter Device Firmware Upgrade (DFU)
- Dimensions – 34.3 x 25.4 mm
- Weight – 2.4 grams
The board is compatible with Lolin/Wemos D1 mini shields, and comes pre-loaded with MicroPython firmware, but is also compatible with Arduino and ESP-IDF. You’ll find resources to get started, schematics, and other documentation in the wiki.
Not all ESP32-S2 variants come with embedded flash and PSRAM, but the ESP32-S2FN4R2 selected here embeds 4MB flash and 2MB PSRAM, which enables the same compact design as for the D1 Mini board, while also exposing some of the extra I/Os. What is not shown in the photo above is the CH340C USB to TTL chip on D1 Mini that is completely gone from S2 mini design since this can be handled from the USB interface in ESP32-S2 processor.
Lolin S2 Mini WiFi IoT board is just 30 cents more expensive than Lolin D1 Mini board, and sells for $4 on Aliexpress, where you’ll also find a wide range of shields and accessories to expand the board with I2C connectors, sensors, a relay, a microSD card, displays, and more.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.