Arduino Uno R3 SMD CH340G ATmega328P Development Board – 5V USB Microcontroller Board

The Arduino Uno R3 SMD CH340G ATmega328P Development Board is designed around the widely used ATmega328P microcontroller and follows the familiar Uno R3 development-board architecture. It is suitable for learning embedded programming as well as building practical electronics and robotics projects.

The board provides digital and analog I/O for connecting external components, while PWM outputs can be used for applications such as LED brightness control and motor-control interfaces. SPI and I2C peripherals allow the board to communicate with displays, sensors, memory devices, and other modules.

The CH340G USB-to-UART interface allows the board to communicate with a computer for programming and serial monitoring. Depending on the operating system, a compatible CH340 driver may be required for the USB serial port to appear correctly.

Features

• ATmega328P SMD microcontroller.
• CH340G USB-to-UART interface.
• 14 digital input/output pins.
• 6 PWM-capable digital pins.
• 6 analog input pins.
• 16MHz operating clock.
• 32KB Flash memory.
• 2KB SRAM.
• 1KB EEPROM for non-volatile data storage.
• 5V operating voltage.
• USB and DC barrel-jack power options.
• ICSP header for programming/debugging access.
• Built-in reset button.
• Onboard Power, L, RX, and TX indicator LEDs.
• Compatible with the Arduino development environment.
• Suitable for robotics, automation, education, IoT prototypes, and general electronics projects.

Applications

• Arduino programming and learning.
• Robotics and robotic vehicles.
• Sensor monitoring systems.
• IoT and automation prototypes.
• Smart-home control projects.
• LED and lighting controllers.
• Motor-control projects using an external driver.
• Data logging systems.
• LCD/OLED and display projects.
• SPI and I2C sensor networks.
• Relay and actuator control.
• STEM and educational electronics.

How to Use

1. Connect the board to a computer using the included USB cable.
2. Install the appropriate CH340 driver if the operating system does not automatically recognize the USB serial interface.
3. Open the Arduino IDE and select the appropriate Arduino Uno board option.
4. Select the COM/serial port assigned to the CH340 interface.
5. Write or upload your Arduino sketch.
6. Connect sensors, displays, drivers, or other peripherals according to their voltage and pin requirements.
7. For motors, high-current LEDs, relays, and other loads, use an appropriate external driver rather than powering the load directly from an Arduino I/O pin.

Important Notes

• The ATmega328P SMD chip is soldered directly to the PCB and is not removable like the socketed DIP version.
• The recommended external input voltage is 7–12V. Although the listed input limit is 6–20V, higher input voltage can increase regulator heating.
• The normal recommended operating current for an individual I/O pin is 20mA. The 40mA figure is an absolute maximum and should not be treated as a normal operating current.
• Do not connect motors, high-power servos, relay banks, or other high-current loads directly to GPIO pins.
• Check polarity carefully before connecting an external power source.
• If using a CH340G-based board, a compatible USB-serial driver may be required on some computers.
• The board's exact dimensions, component layout, color, and connector arrangement may vary slightly between compatible board batches.
• Product images are for illustration only and may differ from the actual product.

Package Includes

• 1 × Arduino Uno R3 SMD CH340G ATmega328P Development Board
• 1 × USB Interface Cable