# Seeed XIAO ESP32-C3 (Seeed Studio)

> The cheapest way into Wi-Fi and Bluetooth on a board the size of a postage stamp.

- **Category:** Boards & controllers
- **Availability:** Listed by maker
- **Price:** US$4.99 (at seeedstudio.com), checked 2026-09-18
- **Good for:** Add Wi-Fi and Bluetooth to a project for the price of a coffee.
- **You'll need:** USB-C cable, the supplied antenna, and firmware you write.
- **Trade-off:** Single core, four ADC pins and no on-board antenna — it is cheap because it is minimal.
- **Page:** https://gadgets.sh/devices/seeed-xiao-esp32c3/

## Where to buy

| Shop | Status | Link |
|---|---|---|
| Seeed Studio | Orderable | https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-esp32c3&utm_content=api |
| The Pi Hut | Orderable | https://thepihut.com/products/seeed-xiao-esp32c3?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-esp32c3&utm_content=api |
| DigiKey | Orderable | https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/113991054/16652880?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-esp32c3&utm_content=api |
| Seeed Studio | Documentation at wiki.seeedstudio.com | https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-esp32c3&utm_content=api |

## Blueprint

**Schematics published.** Seeed publishes the schematic PDF and chip datasheet for the XIAO ESP32C3; the related GitHub repo has only a footprint/pinout library, not the module's own PCB source.

### Design files

- schematic: [XIAO ESP32C3 schematic (PDF, rev 1.3)](https://files.seeedstudio.com/wiki/XIAO_WiFi/Resources/XIAO_ESP32C3_v1.3_SCH_260116.pdf) (PDF)
- datasheet: [ESP32-C3 datasheet (PDF)](https://files.seeedstudio.com/wiki/XIAO_WiFi/Resources/esp32-c3_datasheet.pdf) (PDF)
- pinout: [Pinout diagram, front (PNG)](https://github.com/Seeed-Studio/OSHW-XIAO-Series/blob/main/pinout/XIAO_ESP32-C3_front_pinout.png) (PNG)

### Source repositories

- [Seeed-Studio/OSHW-XIAO-Series](https://github.com/Seeed-Studio/OSHW-XIAO-Series) — docs, MIT, ★91

### Key parts

| Part | Role | Datasheet |
|---|---|---|
| Espressif ESP32-C3 | MCU (single-core RISC-V, Wi-Fi/BLE) | https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf |

_Notes:_ Seeed-Studio/OSHW-XIAO-Series contains a KiCad footprint/symbol library for using the XIAO module as a component in other designs, not the XIAO board's own internal schematic/PCB source, so overall openness is 'schematics' rather than 'open-hardware'.

## Specifications

### Processor & memory

| | |
|---|---|
| Processor | ESP32-C3, single-core 32-bit RISC-V with a four-stage pipeline, up to 160 MHz |
| Memory | 400 KB SRAM and 4 MB flash on-chip |
| Dimensions | 21 × 17.8 mm |

### Radio

| | |
|---|---|
| Wi-Fi | IEEE 802.11 b/g/n, supporting station, SoftAP, combined and promiscuous modes |
| Bluetooth | Bluetooth LE 5.0 with Bluetooth mesh |
| Antenna | External RF antenna included; the maker presents it as the source of the board's RF performance |

### Interfaces & power

| | |
|---|---|
| Buses | 1× UART, 1× I²C, 1× SPI |
| Pins | 11 digital I/O usable as PWM; 4 analogue I/O usable as ADC |
| Power input | 5 V on VIN, or 3.7 V on the battery pin |
| Output | Maximum 3.3 V, 500 mA output; tested at a 3.8 V battery input with 3 A source capability |
| Charging | 380 mA fast charge; 40 mA trickle |
| Wi-Fi current | Typical: 75 mA active, 25 mA modem sleep, 4 mA light sleep |
| Bluetooth current | Typical: 27 mA modem sleep, 10 mA light sleep |
| Deep sleep | 44 µA in the specification table; about 43 µA in the feature list on the same page |
| Temperature | −40 to 85 °C working range |
| Controls | Reset button and boot button |
| Price checked | US$4.99 at the maker's store |

### Compatibility

| | |
|---|---|
| Grove Shield | Compatible with the Grove Shield for Seeeduino XIAO |
| Expansion caveat | On the Seeeduino XIAO Expansion board the SWD spring contacts are not compatible with this board |

## Documentation

- [Maker specifications and documentation](https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/)
- [Seeed Studio store listing](https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html)
- [Espressif ESP32-C3 datasheet](https://files.seeedstudio.com/wiki/XIAO_WiFi/Resources/esp32-c3_datasheet.pdf)
- [XIAO ESP32-C3 v1.3 schematic](https://files.seeedstudio.com/wiki/XIAO_WiFi/Resources/XIAO_ESP32C3_v1.3_SCH_260116.pdf)

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Source: gadgets.sh · https://gadgets.sh/devices/seeed-xiao-esp32c3/ · JSON: https://gadgets.sh/api/v1/devices/seeed-xiao-esp32c3.json