XIAO esp32S3 + wio-sx1262
Genuinely thumb-sized at 21x18mm, yet packing WiFi, Bluetooth, and LoRa capability.
Important: 868 MHz for Europe
Always buy the 868 MHz version for use in Europe. The 915 MHz version (US) is not allowed in Europe.
Understanding the xiao esp32S3 kit
The XIAO ESP32S3 paired with Wio-SX1262 claims the title of smallest mesh development kit available. Measuring merely 21x18mm, it literally rests on a thumbnail.
The XIAO board hosts a capable ESP32-S3 processor whilst the Wio-SX1262 module snaps on via board-to-board connector, adding LoRa transmission alongside existing WiFi and Bluetooth.
For under £15 you obtain a complete mesh node - perfect for learning, prototyping, or establishing budget-conscious mesh infrastructure.
Hardware specifications
| Chipset | ESP32-S3 dual-core Xtensa LX7 (240 MHz) paired with Semtech SX1262 |
| LoRa Frequency | 862-930 MHz range (868 MHz for UK/Europe, 915 MHz for Americas) |
| Display | None standard (expansion options exist) |
| Battery | No internal cell - LiPo connector with charging circuit present |
| GPS | Not equipped (external modules connectable) |
| WiFi / Bluetooth | WiFi 2.4GHz plus Bluetooth 5.0 BLE plus LoRa |
| Dimensions | 21 x 18mm (XIAO standard dimensions) |
| Special Features | 8MB flash storage, 8MB PSRAM, USB-C, GPIO/I2C/UART/SPI interfaces, mesh firmware pre-loaded |
Practical applications
Seeed Studio's XIAO ESP32S3 enjoys widespread popularity amongst developers. Adding the Wio-SX1262 LoRa module (roughly £4.29) creates a complete mesh-ready package.
Connect an external antenna and achieve 2-5 kilometre ranges across open countryside. Enclosure kits with 3D-printed housings offer finished product aesthetics.
Beyond mesh networking, the platform supports Arduino and MicroPython development, single-channel LoRaWAN gateway duties, or environmental sensor integration.
Order the xiao esp32S3 kit
Source components from AliExpress or Seeed Studio directly. XIAO board approximately £9.90, Wio-SX1262 around £4.29. Complete kits with enclosures also available.
Browse on AliExpressMake sure to select the 868 MHz version for Europe
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