LOLIN's Wemos S2 Pico Packs an OLED Display and an Espressif ESP32-S2 Into a Tiny Footprint

Putting a surprisingly flexible microcontroller and a compact OLED right on your breadboard, the compact Pico S2 looks like a winner.

Gareth Halfacree
a month ago β€’ Internet of Things / HW101

LOLIN has launched a new entry in its Wemos family of compact breadboard-friendly microcontroller boards, this time offering a compact OLED display and an Espressif ESP32-S2 microcontroller: the LOLIN S2 Pico.

Brought to our attention by CNX Software, the new LOLIN S2 Pico is built around Espressif's ESP32-S2FN4R2 microcontroller, offering a single-core Xtensa LX7 processor running at speeds up to 240MHz, 2MB of pseudo-static RAM (PSRAM), 4MB of flash memory, and bundled 2.4GHz Wi-Fi connectivity through a PCB antenna built onto the board.

To that, LOLIN has added a compact 128x32 SSD1306-based OLED display panel, Type-C connectivity for data and power with USB On-the-Go support, and general-purpose input/output (GPIO) connectivity in unpopulated breadboard-friendly headers around the two longer sides.

The board's GPIO capabilities include 21 digital pins with interrupt and pulse-width modulation (PWM) support, 14 offering analog input capabilities, a single offering digital-to-analog conversion (DAC) support, and I2C, SPI, and UART buses.

The company promises the board is compatible with both the Arduino IDE and MicroPython, and will ship with a MicroPython firmware installed by default. At 50x23mm (around 2x0.91in), it's a compact design β€” and even manages to find room for a dedicated Grove-style I2C header and a user-addressable button next to a a physical reset switch.

The board is now available on the LOLIN AliExpress store at $6.90, including male pin headers.

Gareth Halfacree
Freelance journalist, technical author, hacker, tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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