The ESP32-DevKitC V1 is a compact 30-pin microcontroller development board designed around the dual-core ESP-WROOM-32 module, serving as a versatile foundation for Wi-Fi and Bluetooth IoT projects. The Micro-USB variant equipped with the CH9102 bridge chip represents a reliable, updated serial option, providing fast upload speeds up to 4 Mbps, native driver compatibility across modern operating systems, and improved connection stability during programming. Despite retaining the legacy Micro-USB interface, the high-performance CH9102 chip significantly reduces flashing timing errors compared to older USB-to-UART bridges.
Conversely, the USB-C variant paired with the CH340 bridge chip updates the board’s physical hardware to modern connectivity standards, allowing developers to use standard USB-C cables for both power and programming. While the CH340 serial converter operates at lower maximum baud rates (up to 2 Mbps) compared to the CH9102, it remains a cost-effective, time-tested driver solution widely supported across major development environments like the Arduino IDE, ESPHome, and PlatformIO. Both board configurations retain the standard 30-pin V1 footprint ($51.5\text{ mm} \times 28.5\text{ mm}$), offering $2.4\text{ GHz}$ dual-mode wireless capabilities and breadboard-friendly prototyping options.
Technical Specifications
| Component / Feature | ESP32 DevKitC V1 (Micro CH9102) | ESP32 DevKitC V1 (USB-C CH340) |
| Main Processor | ESP32-D0WDQ6 / ESP-WROOM-32 (Dual-Core @ 240 MHz) | ESP32-D0WDQ6 / ESP-WROOM-32 (Dual-Core @ 240 MHz) |
| USB Physical Port | Micro-USB | USB Type-C |
| USB-to-UART Bridge IC | WCH CH9102 | WCH CH340 (CH340G / CH340C) |
| Max Serial Transfer Speed | Up to 4 Mbps | Up to 2 Mbps |
| Wireless Connectivity | 2.4 GHz Wi-Fi (802.11 b/g/n) & Bluetooth 4.2 / BLE | 2.4 GHz Wi-Fi (802.11 b/g/n) & Bluetooth 4.2 / BLE |
| Pin Configuration | 30-Pin Dual-Row Headers (15 pins per side) | 30-Pin Dual-Row Headers (15 pins per side) |
| Board Dimensions | $51.5\text{ mm} \times 28.5\text{ mm}$ | $51.5\text{ mm} \times 28.5\text{ mm}$ |
| Operating Voltage | 5V DC via USB / 3.3V DC via power pin | 5V DC via USB / 3.3V DC via power pin |
| Onboard Controls | EN (Reset) & BOOT (IO0) Push Buttons | EN (Reset) & BOOT (IO0) Push Buttons |
