The Seeed Studio XIAO ESP32C3 is an ultra-compact, high-performance IoT development board built around Espressif’s ESP32-C3 RISC-V microcontroller. It packs Wi-Fi, Bluetooth 5.0, battery management, and a capable 32-bit processor into a thumb-sized 21 × 17.8 mm form factor — making it one of the smallest wireless development boards available for IoT, wearable, and space-constrained applications .
At its core is a 32-bit RISC-V single-core processor with a four-stage pipeline running at up to 160 MHz. The chip integrates 400 KB SRAM and 4 MB Flash, providing sufficient memory for complex IoT applications and data storage . This RISC-V architecture offers a modern, efficient alternative to traditional ARM-based microcontrollers, with strong performance and excellent power efficiency.
The board supports a complete 2.4 GHz Wi-Fi subsystem (IEEE 802.11 b/g/n) with Station, SoftAP, SoftAP+Station, and promiscuous modes, along with Bluetooth Low Energy 5.0 and Bluetooth Mesh . An included U.FL/IPEX external antenna enables wireless communication over 100 meters, significantly extending range compared to onboard PCB antennas .
Power efficiency is exceptional. The board offers four working modes with a deep sleep current as low as 44 µA, making it ideal for battery-powered devices that require extended operational life . An onboard lithium battery charge management chip supports 3.7V LiPo batteries with fast (380 mA) and trickle (40 mA) charging, allowing seamless battery-powered deployment .
The board exposes 11 digital I/O pins (all PWM-capable) and 4 analog inputs (ADC), along with UART, I2C, and SPI interfaces for connecting sensors, displays, and peripherals . A USB Type-C connector handles power and programming, and the board includes reset and BOOT buttons for easy operation .
The XIAO ESP32C3 features a production-ready SMD design with no components on the back and standardized stamp holes, making it suitable for direct integration into commercial PCBA designs . It is supported by Arduino IDE, MicroPython, CircuitPython, PlatformIO, ESP-IDF, and Zephyr, with extensive community libraries and examples available .
Whether you are building a wearable health monitor, a smart home sensor, a remote tracking device, or a compact IoT gateway, the Seeed Studio XIAO ESP32C3 offers a powerful, production-ready foundation in an exceptionally small package. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs .
Features
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ESP32-C3 RISC-V single-core processor — 32-bit architecture at up to 160 MHz with four-stage pipeline
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Ultra-compact form factor — Thumb-sized at 21 × 17.8 mm, ideal for wearables and space-constrained designs
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Complete Wi-Fi subsystem — 802.11 b/g/n with Station, SoftAP, SoftAP+Station, and promiscuous modes
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Bluetooth 5.0 & Bluetooth Mesh — Full BLE support for versatile wireless connectivity
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Ultra-low power consumption — Deep sleep current approximately 44 µA for battery-powered applications
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Onboard lithium battery charging — Supports 3.7V LiPo batteries with fast/trickle charging management
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U.FL external antenna included — Enables communication over 100 meters
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Rich I/O interface — 11 PWM-capable GPIOs, 4 ADC inputs, 1× I2C, 1× SPI, 1× UART
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USB Type-C connector — Modern reversible connector for power and programming
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Production-ready SMD design — No components on back, standardized stamp holes for PCBA integration
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Wide development support — Arduino, MicroPython, CircuitPython, PlatformIO, ESP-IDF, Zephyr
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Microcontroller | ESP32-C3 SoC (RISC-V single-core 32-bit) |
| 2 | Clock Speed | Up to 160 MHz |
| 3 | Memory | 400 KB SRAM & 4 MB Flash |
| 4 | Wireless | Wi-Fi 802.11 b/g/n (2.4 GHz), Bluetooth 5.0/Bluetooth Mesh |
| 5 | GPIO / ADC | 11 digital I/O (PWM), 4 analog inputs (ADC) |
| 6 | Deep Sleep Current | Approximately 44 µA |
| 7 | Battery Input | 3.7V LiPo (BAT pin); 5V (VIN pin) |
| 8 | Dimensions | 21 × 17.8 mm |
