UNO‑R3 Official Version Development Board ATMEGA328P CH340G USB Driver Microcontroller Board With USB Cable For Arduino DIY Electronic Project

UNO‑R3 Development Board 📌 Product Overview The UNO‑R3 is an open‑source development board built around the ATMEGA328P microcontroller chip. It can easily connect with various sensors and electronic components such as LED lights, buzzers, buttons and photoresistors to build multiple interesting electronic projects. This board adopts high‑speed ATMEGA328P processing controller. The R3 version optimizes peripheral circuits, upgrades USB chip to ATmega16U2, adds IOREF pin and duplicated I2C pins, and optimizes reset circuit. Simple and clear hardware design makes it very suitable for beginners to learn programming, verify prototypes and stack various compatible expansion shields. ✨ Core Features

1. Main control chip: ATMEGA328P, clock frequency 16MHz.
2. 14 digital I/O pins, 6 pins support PWM output.
3. 6 analog input pins A0‑A5.
4. Memory resource: 32KB Flash, 2KB SRAM, 1KB EEPROM.
5. Operating voltage 5V, external DC input voltage 7‑12V.
6. ATmega16U2 USB chip, supports USB HID emulation for MIDI, Joystick, Keyboard devices.
7. IOREF pin and duplicated I2C SDA/SCL pins are added to improve compatibility of expansion shields.
8. Optimized reset circuit, reset button moved to the corner near USB port for convenient pressing.
9. Standard UNO mounting hole position, compatible with most expansion shields on the market.

📐 Dimension Info Module size: 75X53.5X13mm, Net weight:27g ⚠ Important Usage Notice The external power supply voltage shall not exceed 12V to avoid burning onboard circuit. Do not short‑circuit I/O ports. Kind reminder: If there are version differences or images not been updated, please refer to the actual product. 🛠 Application Scenarios Programming learning for electronics beginners, sensor experimental projects, robot development, smart home prototype design, multi‑shield stacking projects, Arduino‑based automation and electronic DIY projects.