ATmega328P-Based LoRa Development Board

This project offers a cost-effective and flexible communication solution using the LoRa RA-02 module and Atmega328P-AU microcontroller. Designed for developers, this board can be programmed via USB and powered from multiple sources. Here’s a breakdown of its features:

Key Features:

USB Programming and Power:

• The USB Type-C connection allows the board to be programmed and powered with 5V simultaneously.
• The CH340C UART-USB converter ensures seamless communication between the computer and the microcontroller.
• USB Programming and Power:The USB Type-C connection allows the board to be programmed and powered with 5V simultaneously.The CH340C UART-USB converter ensures seamless communication between the computer and the microcontroller.

External Power Input:

• The board can be powered by an external 5V adapter, providing a more stable power supply when needed.
• Safe switching between USB and adapter power is managed effectively.
• External Power Input:The board can be powered by an external 5V adapter, providing a more stable power supply when needed.Safe switching between USB and adapter power is managed effectively.

Safety and Standard Compliance:

• A fuse (500mA/1A) protects the board from overcurrent scenarios.
• USB Type-C CC1 and CC2 resistors (5.1kΩ) ensure compliance with USB standards.
• Safety and Standard Compliance:A fuse (500mA/1A) protects the board from overcurrent scenarios.USB Type-C CC1 and CC2 resistors (5.1kΩ) ensure compliance with USB standards.

V.Regulators:

• The AMS1117-3.3 regulator delivers safe voltage for the LoRa module and other components requiring 3.3V.
• 3.3V Regulator:The AMS1117-3.3 regulator delivers safe voltage for the LoRa module and other components requiring 3.3V.

This board uses AMS1117 regulators for both 3.3V and 5.0V outputs.

• The 3.3V regulator powers components like the LoRa RA-02 module.
• The 5.0V regulator (7-12 V input) supports external power sources for stable operation when USB is not used.

LoRa Communication:

• The RA-02 LoRa module connects to the microcontroller via SPI, optimized for long-range wireless communication.
• LoRa Communication:The RA-02 LoRa module connects to the microcontroller via SPI, optimized for long-range wireless communication.

Status Indicators:

• POWER LED: Indicates the board is powered.
• USER LED: User-controlled via GPIO.
• Status Indicators:POWER LED: Indicates the board is powered.USER LED: User-controlled via GPIO.

Additional Components:

• A 16MHz crystal and 22pF capacitors ensure the microcontroller operates stably.
• Decoupling capacitors (100nF) are used across components for power stability.
• The reset circuit allows both manual and software-controlled resets through the CH340C.
• Additional Components:A 16MHz crystal and 22pF capacitors ensure the microcontroller operates stably.Decoupling capacitors (100nF) are used across components for power stability.The reset circuit allows both manual and software-controlled resets through the CH340C.

Applications:

• IoT Projects
• Long-range data transmission
• Environmental monitoring systems
• Development and prototyping

Advantages:

• Multiple power options: USB or external adapter
• Compact design and low cost
• Easy programming and debugging

The ATECC608A-MAHDA-S on the board is a hardware security chip designed to enhance security in IoT projects. It offers features such as device authentication, data encryption, and secure key storage, making it ideal for applications requiring robust data protection. In LoRa-based long-range communication, it ensures data is safeguarded against unauthorized access.