Meshtastic Firmware for Lora-shuttle: HT-CT62 (ESP32-C3 + SX1262) devboard

Custom Meshtastic firmware for the Lora-shuttle: HT-CT62 (ESP32-C3 + SX1262) devboard Standalone or stacked configuration with a carrier board e.g. AI-On-The-Edge-Cam: ESP32-S3 with PoE, SD, Camera

📦 Hardware Requirements

• HT-CT62 (ESP32-C3 + SX1262) devboard
• 2.54mm headers for stacking (the module has two 8 pin header)
• LoRa antenna compatible with your frequency band
• WLAN antenna (optional)

🔌 Hardware Setup

Hardware Configuration

Pin Mappings

HT-62CT intern PIN mapping between ESP32-C3 and SX1262

ESP32-C3 Pin	SX1262 Pin	Function
GND	GND	Ground
3.3V	3.3V	Power
GPIO 00	N/A	I2C SDA
GPIO 01	N/A	I2C SCL
GPIO 03	DIO1	LoRa Interrupt
GPIO 04	BUSY	Busy Signal
GPIO 05	RST	Radio Reset
GPIO 06	MISO	SPI Data In
GPIO 07	MOSI	SPI Data Out
GPIO 08	NSS	SPI Chip Select
GPIO 09	N/A	Boot User Button
GPIO 10	SCK	SPI Clock

PIN Mapping of the module headers

The module has two 2.54mm header pinouts with 8 pins per side.

Header H1

Header	HT62-CT	Function
Pin 1 - Not used
Pin 2 - Not used
Pin 3 - Not used
Pin 4 - 3.3V	Pin 12 3.3V	Power
Pin 5 - GND	Pin 02 GND	Ground
Pin 6 - GND	Pin 13 GND	Ground
Pin 7 - GND	PIN 21 GND	Ground
Pin 8 - 5V	N/A	USB Typ C - Connector

Header H2

Header	HT62-CT	Function
Pin 1 - RX	Pin 19 RXD	Data
Pin 2 - TX	Pin 20 TXD	Data
Pin 3 - Not used
Pin 4 - Not used
Pin 5 - Not used
Pin 6 - GPIO 02	Pin 08 GPIO 02
Pin 7 - SCL	Pin 01 GPIO 01	I2C SCL
Pin 8 - SDA	Pim 00 GPIO 00	I2C SDA

I2C Sensor Support

GPIO 01 (D7) and GPIO 00 (D6) are available via the SX1262 pass-through pins D7 and D6 for external I2C sensors:

• SDA: GPIO 00 (D6)
• SCL: GPIO 01 (D7)

Compatible sensors include BME280, BME680, SSD1306 displays, etc.

🚀 Installation

Method 1: Web Flasher (Easiest)

1. Connect your HT-CT62 (Esp32-C3 + SX1262) devboard via USB
2. Visit Meshtastic Web Flasher
3. Upload the firmware-seeed-xiao-esp32c3-sx1262-2.7.19.9d06c1b.factory.bin file
4. Follow the on-screen instructions

Method 2: esptool.py

# Install esptool if needed
pip install esptool

# Flash the firmware (adjust port as needed)
esptool.py --chip esp32c3 --port /dev/ttyACM0 --baud 921600 \
  write_flash 0x0 firmware/firmware-seeed-xiao-esp32c3-sx1262-2.7.19.9d06c1b.factory.bin

macOS: Use /dev/cu.usbmodem* or /dev/tty.usbmodem* Windows: Use COM3, COM4, etc. Linux: Use /dev/ttyUSB0 or /dev/ttyACM0

Method 3: PlatformIO (Advanced)

Clone the source and build yourself - see build instructions in the PlatformIO wiki.

⚙️ Configuration

After flashing:

1. Install the Meshtastic app on your phone (iOS / Android)
2. Connect via Bluetooth (initial Password: 123456)
3. Set your device name and region
4. Join or create channels

✨ Features

• ✅ Full Meshtastic support - Messaging, position sharing, telemetry
• ✅ SX1262 LoRa radio - Long range mesh networking
• ✅ I2C sensor support - GPIO04/05 available for BME280, OLED displays, etc.
• ✅ Compact form factor - Stackable design
• ✅ Low power consumption - Perfect for portable nodes

🔧 Adding I2C Sensors (Optional)

The module provide I2C connectivity:

• SDA: GPIO00 (D0)
• SCL: GPIO01 (D1)

Compatible sensors:

• BME280/BME680 (temperature, humidity, pressure)
• SSD1306 OLED display (128x64)
• Any I2C sensor at 3.3V

Connect sensors to the pass-through pins and share 3.3V/GND.

📊 Specifications

• MCU: ESP32-C3 (RISC-V, 160MHz, 400KB SRAM, 4MB Flash)
• Radio: Semtech SX1262 (LoRa, -148dBm sensitivity)
• Frequency: 868MHz or 915MHz (region dependent)
• Transmit Power: Up to +22dBm
• Bluetooth: BLE 5.0
• WiFi: 2.4GHz 802.11b/g/n

🐛 Troubleshooting

"Error no LoRa TX/RX possible"

• Ensure antenna is connected to the HT-62CT
• Check power pins or USB-C Connetor are aligned/ connected correctly

No nodes appear

• Verify region settings match nearby nodes
• Check channel configuration
• Ensure antenna is connected
• Test range (LoRa needs line of sight for best results)

Can't flash firmware

• Hold BOOT button while connecting USB
• Try a different USB cable (some are power-only)
• Check port with pio device list or device manager

📚 Resources

• Meshtastic Documentation
• HT-CT62 (Esp32-C3 + SX1262) devboard
• Meshtastic Discord

📝 Firmware Details

• Version: 2.7.19.9d06c1b
• Build Date: 2026-02-31
• Hardware Model: 254 (SEEED_XIAO_ESP32C3)
• Radio: SX1262 with DIO2 RF switching, 1.8V TCXO

🤝 Contributing

Found a bug or have a suggestion? Open an issue or submit a pull request!

⚖️ License

This firmware is based on Meshtastic (GPL-3.0).

🙏 Credits

• Meshtastic Project - Open source mesh networking
• Heltec - HT-62CT hardware
• Prokyber - Lora-shuttle: HT-CT62 (Esp32-C3 + SX1262) devboard
• Community contributors and testers

---

⚠️ Important: Always use an appropriate antenna for your region and frequency. Never transmit without an antenna - this can damage the radio module!