Arduino Compatible Nano V3.0 ATmega328P CH340 Mini-USB Board (With Soldered Headers)

Arduino Compatible Nano V3.0 ATmega328P CH340 Mini-USB Board (With Soldered Headers) is a ready-to-plug, breadboard-friendly 8-bit AVR microcontroller board featuring factory-soldered 30-pin male headers and a 6-pin ICSP header. Furthermore, it combines the 16 MHz Microchip/Atmel ATmega328P-AU SMD microcontroller with a WCH CH340G USB-to-serial chip and a rugged Mini-USB Type-B receptacle. Consequently, it offers the full 32KB Flash capability of an Arduino UNO R3 in a compact 45mm × 18mm DIP-30 module while adding two extra 10-bit analog inputs (`A6` and `A7`) with zero soldering required.

Key Features:

• Factory Pre-Soldered DIP-30 Male Headers: Ships with both 15-pin 2.54mm bottom header rows and the top 6-pin ICSP header professionally wave-soldered and ready to press into a solderless breadboard.
• Bonus Analog Inputs (`A6` & `A7`): Because the Nano V3.0 uses the 32-pin TQFP package of the ATmega328P, it exposes 8 total 10-bit ADC channels (`A0–A7`) compared to only 6 on the DIP-28 Arduino UNO.
• Rugged Mini-USB Type-B Connector: Heavy-duty 5-pin Mini-USB receptacle withstands thousands of classroom insertion cycles without snapping off the PCB.
• Onboard 5V AMS1117 Linear Regulator: Accepts 7V–12V DC unregulated power on `VIN (Pin 30)` with automatic Schottky diode selection when USB 5V is connected.
• Four Diagnostic Status LEDs: Dedicated SMD LEDs for `POW` (Power), `L` (`D13` User LED), `TX` (Serial Transmit), and `RX` (Serial Receive).

Technical Specifications:

• Microcontroller: Microchip / Atmel ATmega328P-AU (TQFP-32 Package, 8-Bit AVR @ 16 MHz)
• USB-to-UART Bridge: WCH CH340G
• Operating Logic Voltage: 5.0V DC
• Input Supply Voltage (`VIN` Pin): 7.0V to 12.0V DC Recommended (6V–20V Limits)
• Digital I/O Pins: 22 Total Digital I/O (`D0–D13` and `A0–A5`; 6 PWM Outputs on `D3, D5, D6, D9, D10, D11`)
• Analog Input Pins: 8 Channels (`A0–A7`, 10-Bit ADC; Note: `A6` and `A7` are Analog Input Only)
• DC Current per I/O Pin: 20 mA Typical (40 mA Max) | 3.3V Output Supplied by CH340G (~50 mA Max)
• Memory: 32 KB Flash (2 KB / 0.5 KB Bootloader), 2 KB SRAM, 1 KB EEPROM

Mechanical Specifications:

• Form Factor: Standard 30-Pin DIP Breadboard Footprint (15.24mm / 0.6-inch Row Spacing)
• Header State: Pre-Soldered 2 × 15-Pin Male Bottom Headers + 1 × 6-Pin (2×3) Top ICSP Male Header
• Mounting Holes: 4 × 1.8mm Corner Mounting Holes

Dimensions:

• Length: 45.0 mm
• Width: 18.0 mm
• Height: 19.0 mm (Including Pre-Soldered Pins and ICSP Header)
• Weight: ≈ 7.0 g

Pinout and Wiring:

• Power Pins: `VIN (Pin 30)` accepts 7V–12V DC; `5V (Pin 27)` outputs regulated 5V (or accepts external regulated 5.0V); `3V3 (Pin 17)` outputs 3.3V up to 50mA; `GND` is on Pins 4 and 29.
• I2C & SPI Buses: `A4 (SDA) / A5 (SCL)` for I2C; `D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK)` for SPI.
• Analog-Only Pins (`A6` & `A7`): Pins `A6` and `A7` connect directly to the internal ADC multiplexer without digital port buffers; therefore, use them strictly with `analogRead()` and never with `digitalRead()` or `digitalWrite()`.
• Engineering Precaution: In the Arduino IDE (`Tools -> Board -> Arduino Nano`), if sketch upload times out with `stk500_getsync()`, switch `Tools -> Processor` between `ATmega328P` (115200 baud new Optiboot) and `ATmega328P (Old Bootloader)` (57600 baud).

Datasheet Reference:

• View Official Arduino Nano (ATmega328P) Technical Datasheet & Pinout PDF

Commonly Used in:

• Solderless Breadboard Prototyping and Classroom Microcontroller Labs
• Nano IO Expansion Shields, Terminal Adapter Boards, and CNC Shield V4
• Compact Line-Follower Robots, RC Telemetry Modules, and Wearable Electronics

Applications:

• Instant Breadboard Development: Drops straight across the center trough of any 400-point or 830-point breadboard without waiting for soldering tools.
• Screw-Terminal & Sensor Shield Stacking: Plugs directly into the female sockets of Nano Terminal Expansion Boards and Nano I/O Sensor Shields.
• 8-Channel Analog Sensor Arrays: Reads 8 IR reflectance sensors (`A0–A7`) for high-speed PID line-following robots.

Equivalent Models:

• Arduino Compatible Nano V3.0 (Unsoldered Headers): Identical board supplied with loose header strips for soldering wires directly to the PCB pads.
• Arduino Nano V3.0 ATmega328P CH340 – Type-C: Upgrades the Mini-USB port to a modern reversible USB Type-C receptacle.
• Arduino Pro Mini 5V/16MHz: Even smaller 33×18mm ATmega328P board that omits the onboard USB-to-serial chip to minimize standby power consumption.

Package Includes:

• 1 × Arduino Compatible Nano V3.0 ATmega328P CH340 Mini-USB Board (With Soldered Headers)