- 2.4 GHz Wi-Fi (802.11b/g/n) and Bluetooth® 5 module
- Built around ESP32-C3 series of SoCs, RISC-V single-core microprocessor
- Flash up to 16 MB
- 15 GPIOs
- On-board PCB antenna or external antenna connector
2x9 pins
- GPIO == 13
- TXD / RXD
Versions
- ESP32-C3-WROOM-02-H4 - 105C
- ESP32-C3-WROOM-02-N4 - normal temp.
- ESP32-C3-WROOM-02U-H4
- ESP32-C3-WROOM-02U-N4 - ipex antenna

Dimensions

Pin Definitions

datasheet
https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf https://www.espressif.com.cn/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_cn.pdf
hardware design guidelines and module design guidelines
https://docs.espressif.com/projects/esp-at/en/latest/esp32c3/Get_Started/Hardware_connection.html
peripheral design
page 24.
