UNO R3 ATmega328P CH340 Development Board – Arduino Compatible – Support Documentation
The UNO R3 ATmega328P CH340 Development Board is a cost-effective, fully Arduino-compatible microcontroller board. It utilizes the ATmega328P microcontroller and the CH340 USB-to-serial converter, offering a reliable platform for various electronics projects, from prototyping to educational applications.
Product Overview
- Microcontroller: ATmega328P
- USB-to-Serial Converter: CH340
- Operating Voltage: 5V
- Input Voltage (Recommended): 7-12V
- Digital I/O Pins: 14 (6 PWM outputs)
- Analog Input Pins: 6
- DC Current per I/O Pin: 20 mA
- Flash Memory: 32 KB (0.5 KB used by bootloader)
- SRAM: 2 KB
- EEPROM: 1 KB
- Clock Speed: 16 MHz
- USB Connector: USB Type-B or Micro USB (varies by board)
- Dimensions: 68.6 mm x 53.4 mm
- Weight: 25 g
Pinout Description
| Pin | Label | Description |
|---|---|---|
| 1 | D0 – D13 | Digital I/O Pins (D0: RX, D1: TX; D3, D5, D6, D9, D10, D11: PWM) |
| 2 | A0 – A5 | Analog Input Pins |
| 3 | GND | Ground |
| 4 | 5V | 5V Output |
| 5 | 3.3V | 3.3V Output (max 50 mA) |
| 6 | VIN | Input Voltage (7-12V recommended) |
| 7 | AREF | Analog Reference Voltage |
| 8 | RESET | Reset Pin |
| 9 | IOREF | Provides the voltage reference at which the microcontroller operates |
| 10 | ICSP | In-Circuit Serial Programming Header |
How to Use the Board
- Install CH340 Driver: Download and install the CH340 driver suitable for your operating system to enable USB communication.
- Connect to Computer: Use a USB cable to connect the board to your computer. The power LED should illuminate.
- Open Arduino IDE: Launch the Arduino IDE on your computer.
- Select Board: Navigate to Tools > Board > Arduino Uno.
- Select Port: Go to Tools > Port and select the port corresponding to your UNO R3 board.
- Upload Sketch: Write your code or open an example sketch, then click the upload button to program the board.
Applications
- Embedded Systems Development
- Educational Projects and Learning
- Prototyping Electronic Devices
- DIY Electronics Projects
- Robotics Control Systems
- Home Automation Systems
Troubleshooting
- Board Not Recognized: Ensure the CH340 driver is correctly installed. Try using a different USB cable or port.
- Upload Errors: Verify the correct board and port are selected in the Arduino IDE. Press the reset button before uploading if necessary.
- Power Issues: Confirm that the board is receiving power via USB or an external power source. Check for any loose connections.
- Unresponsive Board: Try resetting the board. If issues persist, re-upload the bootloader using an external programmer.
Frequently Asked Questions (FAQs)
- Q: What is the difference between the CH340 and ATmega16U2 USB-to-serial converters?
- A: The CH340 is a cost-effective USB-to-serial converter used in many Arduino-compatible boards. Unlike the ATmega16U2, it may require additional drivers on some operating systems but offers similar functionality for programming and serial communication.
- Q: Can I use standard Arduino shields with this board?
- A: Yes, the UNO R3 CH340 board maintains the standard Arduino Uno form factor and pinout, ensuring compatibility with most Arduino shields.
- Q: Is the board compatible with the Arduino IDE?
- A: Absolutely. The board is fully compatible with the Arduino IDE. Select “Arduino Uno” as the board type when uploading sketches.
- Q: How do I power the board without a USB connection?
- A: You can power the board using the DC barrel jack (7-12V recommended) or by supplying voltage to the VIN and GND pins.
Note: Always ensure that your operating system has the necessary drivers installed for the CH340 USB-to-serial converter to function correctly.