Ultra-stable USB to TTL CH340G UART Serial Adapter Module STC 5V/3.3V 6Pin
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Description
Enhanced USB to TTL CH340G UART Serial Adapter Module – 5V/3.3V Compatibility
Unlock seamless connectivity and effortless communication with the ultra-stable USB to TTL CH340G UART Serial Adapter Module. Engineered with precision and reliability in mind, this module serves as the quintessential tool for your USB to TTL electronic projects.
Key Features:
- Integrated USB to TTL Chip: Seamlessly transfer data with the built-in USB to TTL transfer chip, ensuring swift and reliable communication.
- Tailored for Electronic Projects: Designed to cater to a wide array of USB to TTL electronic projects, this module is your go-to solution for effective data transmission.
- Effortless MCU Connection: Featuring a TTL interface output, connecting to your MCU is a breeze, facilitating smooth and efficient data exchange.
- Real-time Status Monitoring: Stay informed at a glance with the integrated status LED, providing you with valuable insights into the module’s operational status.
- Dual Voltage Compatibility: Boasting dual 3.3V and 5V power outputs, this module harmoniously interacts with both 3.3V and 5V target devices, enhancing versatility.
- Compact and Practical: With dimensions measuring 55mm x 16mm, this module is compact yet powerful, fitting seamlessly into your project setups.
- Wide System Compatibility: Compatible with various operating systems, including Windows Server 2008, Win7, and Win8 (32-bit/64-bit), as well as Windows 98/ME/2000/XP/Server 2003/VISTA.
- Selectable Voltage Levels: Mitigate risks by effortlessly selecting between 3.3V and 5V through a convenient short-circuit mechanism.
- Intuitive Indicator Lights: Experience ease of use with distinct TXD and RXD indicator lights, providing intuitive insights into module functionality, even without specialized instruments.
- Premium Build Quality: Durable high-grade yellow pins set this module apart, offering enhanced longevity compared to standard black-market alternatives.
- Cutting-Edge CH340G Chip: Employing the latest original CH340G chips, our module is aligned with STC’s recommended USB to TTL chips. Say goodbye to compatibility issues caused by varying drivers and computers.
Whether you’re a seasoned developer or a hobbyist, the CH340G module stands as a testament to stability and compatibility. From seamless MCU connectivity to dual-voltage versatility, this module is your gateway to hassle-free data transfer.
Embrace the future of electronic projects – choose the CH340G module today and experience the difference in reliable data communication.
📌 Code Examples & Usage – USB to TTL Serial Adapter (CH340G)
📋 Overview
This USB to TTL serial adapter uses the reliable CH340G USB-to-UART chip to allow your computer to communicate with microcontrollers and serial devices using TTL logic levels.
It is commonly used for:
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Programming Arduino-compatible boards
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Programming ESP8266 / ESP-01 / ESP32-CAM
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Serial debugging (Serial Monitor)
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Communicating with UART devices
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Firmware flashing & testing
⚙ Key Features
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USB interface: CH340G
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Logic voltage selection: 5V / 3.3V
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UART signals: TX / RX
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Power output available on header
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Compact 6-pin design
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Compatible with Windows, macOS, Linux
⚠ IMPORTANT – Voltage Selection (READ FIRST)
🚨 Set the correct voltage before connecting anything
| Device | Required Setting |
|---|---|
| Arduino Uno / Nano (ATmega328) | 5V |
| ESP8266 / ESP-01 / ESP32 | 3.3V |
| STM32 (most boards) | 3.3V |
| Sensors / logic modules | Check datasheet |
❌ Applying 5V to a 3.3V device WILL damage it
🔌 Pinout (6-Pin Header – Typical)
| Pin | Function |
|---|---|
| GND | Ground |
| VCC | 3.3V or 5V output |
| TXD | Transmit (from USB adapter) |
| RXD | Receive (to USB adapter) |
| DTR / RTS | Auto-reset (if supported) |
| CTS | Flow control (optional) |
📌 Pin order may vary slightly — always check the silkscreen.
🔌 Basic Wiring Rules (Very Important)
✔ TX → RX
✔ RX → TX
✔ GND → GND
📌 TX and RX must be crossed, not straight-through.
🔌 Example – Programming an Arduino Pro Mini
| USB-TTL | Pro Mini |
|---|---|
| VCC | VCC (5V or 3.3V version) |
| GND | GND |
| TXD | RX |
| RXD | TX |
| DTR | RESET (via 0.1µF cap) |
📌 If DTR is not connected, press RESET manually when uploading.
🔌 Example – Programming ESP-01 / ESP-01S
| USB-TTL | ESP-01 |
|---|---|
| VCC | 3.3V |
| GND | GND |
| TXD | RX |
| RXD | TX |
| GPIO0 | GND (for upload mode) |
📌 Remove GPIO0-GND after upload
📌 Stable 3.3V power is critical
🔌 Example – ESP32-CAM Programming
| USB-TTL | ESP32-CAM |
|---|---|
| 5V | 5V |
| GND | GND |
| TXD | U0R |
| RXD | U0T |
| GPIO0 | GND (upload only) |
📌 Remove GPIO0-GND to run sketch
🛠 Driver Installation (CH340G)
Windows
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Install CH340 driver if COM port does not appear
macOS
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Modern macOS versions usually work automatically
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Older versions may require CH340 driver
Linux
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Supported natively (no driver required)
🧪 Test Example – Serial Loopback Test
This confirms the adapter itself works.
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Disconnect from any device
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Connect TX ↔ RX together
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Open Serial Monitor
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Type text — it should echo back
✔ If it echoes, the adapter is working
🧪 Arduino Serial Test Sketch
🧠 Common Issues & Fixes
| Issue | Cause | Fix |
|---|---|---|
| No COM port | Driver missing | Install CH340 driver |
| Upload fails | TX/RX reversed | Swap TX/RX |
| ESP won’t boot | Wrong voltage | Set to 3.3V |
| Random resets | Weak power | Use external regulator |
| No serial output | Wrong baud | Match baud rate |
Additional information
| Weight | 30 g |
|---|---|
| Dimensions | 260 × 160 × 20 mm |
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