USB to TTL Serial Converter Module (CH340C) 3.3V/5V Switchable with Auto Program Signals for ESP8266/ESP32 and Arduino

Description

Product Description

This USB to TTL serial converter module is built around the CH340C chipset and is designed for reliable UART communication through a standard USB port. It’s ideal for everyday tasks like serial debugging, reading logs, firmware flashing, and testing TTL serial devices used in Arduino and ESP development.

The onboard switch lets you select 3.3V or 5V logic levels, making it easier to work safely with different boards without extra level shifters. The module can also provide selectable 3.3V or 5V power output to support many small projects during programming and bench testing.

For ESP development, the board includes the common DTR/RTS control signals used for automatic boot/reset (depending on your flashing tool and wiring), reducing manual steps when uploading firmware. A built-in 2×4 female header is provided to program ESP-01 modules directly, helping keep wiring clean and consistent.

Use this module for ESP8266/ESP32 serial flashing, Arduino serial communication, router/embedded console access, and general TTL UART troubleshooting.

Key Features

• CH340C USB to TTL (UART) serial converter

• Switchable 3.3V / 5V logic level via onboard switch

• Selectable 3.3V / 5V output power available from the adapter

• Auto reset / auto boot signal support for ESP modules (depends on software setup)

• Built-in 2×4 female header for direct ESP-01 programming

• Suitable for debugging, firmware uploading, and serial console work

• Supports loopback testing by shorting TX and RX

Specifications

• Chipset: CH340C

• USB: Compatible with USB 1.1 / 2.0 / 3.0

• Input Voltage: 5V from USB

• Logic Voltage: 3.3V or 5V (selectable)

• Serial Baud Rate: Up to 115200 bps

• OS Support: Windows (32/64-bit), macOS, Linux, Android (driver availability depends on device/OS)

Package Includes

1 × CH340C USB to TTL Converter Module