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USB-TTL serial communication module based on CH340C

Overview

Project Introduction:
This project is a serial communication module based on the CH340C USB-to-serial chip. The module features a power indicator, data transmit and receive indicator lights, and exposes VCC, 3.3V, TXD, RXD, RTS, DTR, and GND pins. It supports full-duplex serial port with built-in transmit and receive buffers, supports baud rates from 50bps to 2Mbps, and has a 3.3V power output. An automatic download module can be added if needed.
Usage Notes:
The CH340C requires the CH340 driver. Download and install the driver from CH341SER.EXE - Nanjing Qinheng Microelectronics Co., Ltd. (wch.cn).
If your computer displays a message indicating that the device cannot be recognized, please check the following:
1. Whether the driver has been correctly downloaded and installed.
2. Whether the components are correctly soldered and whether there are any cold solder joints.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2026-03-26 02:40:53

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