$4 Lolin S2 Mini ESP32-S2 WiFi IoT board works with Wemos D1 Mini shields

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.

Lolin S2 Mini boardLolin S2 Mini V1.0.0 specifications:

  • 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.

Lolin S2 Mini vs Wemos D1 mini
Lolin S2 Mini vs Wemos D1 mini

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.

Wemos D1 mini stacked shields
Wemos D1 Mini with stacked shields – Source: Getting started with Wemos D1 Mini

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.

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4 Replies to “$4 Lolin S2 Mini ESP32-S2 WiFi IoT board works with Wemos D1 Mini shields”

  1. It should be compared to the few D1 esp32 available out there. I’m not sure they’re produced by WeMos, though, considering how much they’re being copied. And in this case it looks slightly cheaper and thinner since they don’t use the module, just the MCU.

    1. Agreed. I use several of the ebay D1 Mini ESP32 boards that look very similar to this one, and I love them. I don’t think they have any PSram though, so this new offering should be better I’d think.

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