LoRaWAN Sensor HT-CT62

A LoRaWAN communication project for Heltec HT-CT62 devices, featuring two Arduino sketch implementations for wireless sensor data transmission.

Overview

This project provides LoRaWAN connectivity solutions for the Heltec HT-CT62 device, supporting both basic and advanced communication modes. The system enables remote sensor monitoring through LoRaWAN networks with configurable parameters and multiple authentication methods.

Project Structure

├── LoRaWan/                    # Basic LoRaWAN implementation
│   └── LoRaWan.ino            # Simple LoRaWAN communication sketch
├── LoRaWanNode/               # Advanced LoRaWAN node implementation
│   └── LoRaWanNode.ino        # Feature-rich node with serial commands
├── HT-CT62(Rev1.1).pdf        # Device datasheet and technical documentation
└── README.md                  # This file

Features

Basic Implementation (LoRaWan/)

• Standard LoRaWAN Class A communication
• OTAA (Over-The-Air Activation) support
• Mock data transmission for testing
• 15-second transmission intervals
• Confirmed message transmission

Advanced Implementation (LoRaWanNode/)

• Enhanced LoRaWAN Class C communication
• Serial command interface for real-time control
• EEPROM storage for persistent configuration
• Debug mode with detailed logging
• Dynamic payload management
• Remote device restart capability
• Runtime App EUI and App Key modification

Hardware Requirements

• Device: Heltec HT-CT62 (Rev 1.1 or later)
• Connectivity: LoRaWAN gateway within range
• Development: Arduino IDE with Heltec board support

Software Requirements

• Arduino IDE
• Heltec ESP32 board package
• LoRaWAN library for Heltec devices

Configuration

Network Parameters

The project supports both OTAA and ABP activation methods:

OTAA Configuration

uint8_t devEui[] = {0x70, 0xB3, 0xD5, 0x7E, 0xD0, 0x06, 0x53, 0xC8};
uint8_t appEui[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
uint8_t appKey[] = {0x74, 0xD6, 0x6E, 0x63, 0x45, 0x82, 0x48, 0x27, 0xFE, 0xC5, 0xB7, 0x70, 0xBA, 0x2B, 0x50, 0x45};

Regional Settings

• Default Region: Configurable via Arduino IDE tools
• Channel Mask: Channels 0-7 enabled by default
• Data Rate: DR3 (configurable)

Advanced Node Serial Commands

The advanced implementation supports real-time commands via serial interface:

Command	Format	Description
1 + data	1Hello World	Send custom data payload
2	2	Restart the device
3 + 8 bytes	3XXXXXXXX	Change App EUI
4 + 16 bytes	4XXXXXXXXXXXXXXXX	Change App Key

Installation and Setup

1. Install Arduino IDE with Heltec ESP32 support
2. Clone/Download this repository
3. Open desired sketch (LoRaWan.ino or LoRaWanNode.ino)
4. Configure LoRaWAN parameters for your network
5. Select correct board and region in Arduino IDE
6. Upload the sketch to your HT-CT62 device

Usage

Basic Implementation

1. Power on the device
2. Monitor serial output for connection status
3. Device will automatically join the network and transmit data every 15 seconds

Advanced Implementation

1. Power on and monitor serial output
2. Send commands via serial interface for real-time control:

   1sensor_data_123    # Send sensor data
   2                   # Restart device  
   3APPEUI01           # Set new App EUI
   4APPKEY1234567890AB # Set new App Key
   

Debug Mode

Enable debug output in the advanced implementation:

#define DEBUG_MODE 1  // Set to 1 to enable debug messages

Transmission Settings

• Duty Cycle: 15 seconds (configurable)
• Confirmed Messages: Enabled
• Retry Attempts: 4 attempts with adaptive data rate
• Application Port: 2
• Max Payload: 32 bytes

Technical Specifications

• Device Class: A (basic) / C (advanced)
• Activation: OTAA preferred, ABP supported
• ADR: Adaptive Data Rate enabled
• Regional Support: Multiple regions via Arduino IDE configuration

Troubleshooting

Common Issues

1. Join Failed: Check devEui, appEui, and appKey configuration
2. No Gateway: Ensure LoRaWAN gateway is within range
3. Region Mismatch: Verify region settings match your location
4. Payload Too Large: Keep data payload ≤ 32 bytes

Debug Steps

1. Enable debug mode in advanced implementation
2. Monitor serial output for detailed logs
3. Verify network credentials with your LoRaWAN provider
4. Check regional frequency plan compatibility

License

This project is based on Heltec Automation examples and follows their licensing terms.

Contributing

1. Fork the repository
2. Create a feature branch
3. Commit your changes
4. Push to the branch
5. Create a Pull Request

Support

• Heltec Documentation: https://www.heltec.org
• LoRaWAN Specification: LoRaWAN 1.0.2+
• Hardware Manual: See HT-CT62(Rev1.1).pdf for detailed specifications

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Manufacturer: Heltec Automation
Website: www.heltec.org
Device: HT-CT62 LoRaWAN Sensor Node