Description
Product Overview
A compact ATmega328P-AU TQFP-32 development board designed for Arduino-compatible projects, robotics, sensors, automation, and DIY embedded applications. The board comes with a preprogrammed Arduino Nano bootloader, allowing sketches to be uploaded directly through the onboard USB Type-C and CH340C USB-to-Serial interface.
All GPIO pins are brought out to convenient 3-pin SIG / VCC / GND headers, making it easier to connect sensors and modules compared with conventional Arduino Nano-style boards. A dedicated 6-pin ISP header and auxiliary I²C and UART connectors are also provided.
Key Features
- ATmega328P-AU microcontroller in TQFP-32 package
- Preprogrammed Arduino Nano bootloader
- Onboard CH340C USB-to-UART interface
- USB Type-C connector for programming and serial communication
- All GPIO pins accessible through SIG / VCC / GND headers
- Convenient 3-pin header arrangement for sensors and modules
- Dedicated 6-pin ISP programming header
- Dedicated 4-pin I²C auxiliary connector
- Dedicated 4-pin UART auxiliary connector
- Onboard D13 user LED
- Power indicator LED
- TX and RX activity LEDs
- Onboard AMS1117-3.3V voltage regulator
- Compact design suitable for robotics and hobby projects
Technical Specifications
| Specification |
Details |
| Microcontroller |
ATmega328P-AU |
| Package |
TQFP-32 |
| MCU Architecture |
8-bit AVR |
| Bootloader |
Arduino Nano bootloader, preprogrammed |
| USB Interface |
USB Type-C |
| USB-to-UART IC |
CH340C |
| Main Regulator |
AMS1117-3.3V |
| Operating Logic |
5 V |
| GPIO Connection |
SIG / VCC / GND 3-pin headers |
| ISP Interface |
6-pin ISP header |
| I²C Interface |
4-pin auxiliary connector |
| UART Interface |
4-pin auxiliary connector |
| User LED |
D13 / PB5 |
| LEDs |
Power, TX, RX, D13 |
| Programming |
USB bootloader or ISP |
| Application |
Arduino, robotics, sensors, embedded projects |
GPIO Headers
The board is designed to make connecting external sensors and modules easier.
GPIO pins are arranged on headers in a convenient:
SIG — VCC — GND
configuration.
This allows compatible sensors and modules to be connected with simple 3-wire connections without needing separate jumper wires for the power rails.
The available ATmega328P I/O includes the digital and analog pins used by the Arduino UNO platform.
USB Programming
The board uses a CH340C USB-to-UART converter together with a USB Type-C connector.
Because the ATmega328P-AU is supplied with the Arduino UNO bootloader already programmed, you can upload Arduino sketches directly through USB without an external programmer.
Typical workflow:
PC → USB Type-C → CH340C → ATmega328P-AU
The same USB connection can also be used for serial communication with the board.
LED Indicators
The board includes four onboard LEDs:
| LED |
Function |
| POWER |
Indicates board power |
| TX |
UART transmit activity |
| RX |
UART receive activity |
| D13 |
Connected to Arduino digital pin D13 / PB5 |
The D13 LED can be controlled from Arduino sketches and is useful for testing the board with the standard Blink example.
I²C Auxiliary Connector
A dedicated 4-pin I²C connector is provided for convenient connection of I²C peripherals.
Typical connections include:
Suitable for OLED displays, RTC modules, sensors, IO expanders, and other I²C devices.
UART Auxiliary Connector
A dedicated 4-pin UART connector provides convenient access to the ATmega328P serial interface for external UART devices.
Typical connections include:
This can be used with GPS modules, Bluetooth modules, serial displays, and other UART peripherals.
ISP Programming
A standard 6-pin ISP header is included for direct AVR programming.
It can be used for:
- Reprogramming the ATmega328P
- Replacing the bootloader
- Low-level AVR development
- Programming without the USB bootloader
Power
The board uses an onboard AMS1117-3.3V regulator for 3.3 V regulated power.
The 5 V rail is also available to external peripherals through the GPIO and auxiliary connectors.
Typical Applications
- Arduino-compatible projects
- Robotics and robot controllers
- DIY sensor projects
- Automation systems
- Educational electronics
- Embedded control applications
- I²C sensor interfaces
- UART modules
- OLED/LCD projects
- SPI peripherals
- Custom Arduino-based controllers
- Hobby and prototyping projects
What’s Included
- 1 × ATmega328P-AU Development Board
Notes
- The ATmega328P-AU comes preprogrammed with the Arduino Nano bootloader.
- USB programming requires a USB Type-C data cable.
- External sensors, modules, cables, and programmers are not included unless specifically stated.
- The board operates as a 5 V ATmega328P platform.
- The onboard regulator is AMS1117-3.3V only; there is no onboard 5 V regulator Be sure the power input not exceed 6V.
- The SIG / VCC / GND header arrangement is intended to simplify connections to compatible 3-wire sensors and modules.
Arduino UNO Rev3 by UGE Electronics
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