In recent years, LoRa devices has got more and more users’ attention due to rapidly developing of outdoor communication and emergency response technology in the United States. So are Meshtastic network, Mesh net work and off-grid communication. While, how to build a usable long-range off-grid communication system from scratch?
You wil get a clear workflow from principle and devices suggestions to actual deployment after reading this article guide.
What is Meshtastic Off-Grid Communication System?
Meshtastic is an open-source communication solution based on LoRa technology. It achieves communication, data transfer and message texting even without internet and cellular network.
Core logic of Meshtastic:
- Mesh network formed by multi LoRa devices.
- Each device is a communication terminal, also a repeater node.
- Data transferred via “hop” in every node.
In a word, you are able to build a communication net work with no base station.
Core Components to Build the Communication System
There are 3 essential parts to build a long-range off-grid comm. System:
1. Core hardware - LoRa devices
Devices that used to transmit and receive radio signal:
- ESP32 + LoRa module
- Meshtastic node devices
- GPS support all-in-one device kit with screen
Network range of every node can be extended.
2. Mesh network structure
The key advantage of Meshtastic is Mesh structure:
- More nodes, larger coverage area.
- Automatic data relay
- Bypass barriers
Effective communication rage can reach up to several kilometers or even longer.
3. Power supply system
Largest challenge to off-grid communication is not itself, but the power supply:
- Battery ( 10000 mAh capacity at least)
- Solar energy
- Magnetic power bank ( portable, easy to deploy)
Stable power supply guarantees a steady communication network.
5 Steps to Build A Long Range Meshtastic Communication System
Step 1: Prepare basic devices
- 2 or 3 LoRa devices
- Mobile phone used to connect Bluetooth
- Antenna used to increase signal
Step 2: Flash the Meshtastic Firmware
Meshtastic is an open source system which the firmware needs to be flashed in device
- Use official Web Flasher
- Choose US 915 MHz frequency
Step3: Connected to Phone, Set the Network Through the APP
- Set the channel
- Set the Encryption Key ( PSK )
- Configure the Device Name
Meshtastic support encrypted communication ( AES ) by default.
Step 4: Deploy Nodes ( Key Factor to communication distance)
This is the most important step to determine success or failure.
Optimal deploy strategy:
- Elevated locations ( Rooftops/ Mountain Peaks )
- Open Environments
- Avoid Obstructions (Buildings/ Trees )
Nodes at high elevation are natural signal amplifier.
Step 5: Mesh network Extension
You must add nodes to reach real long range communication capability:
- Add relay nodes ( router )
- Deploy fixed node + mobile node
- Construct multi-hop paths
The communication will be more stable once you add more nodes
Actual Application Scenarios
1. Outdoor Adventure
Easily commutes with teammates in national park or remote mountain areas.
2. Emergency Communication
Replace traditional communication infrastructures during natural disasters
3. Drone & Remote Monitoring
Long distance data transfer
4. Farm / Remote Region
Low cost IoT + communication system
Common Mistakes
Reasons that causes failure for starter and beginners:
- Too few nodes to form Mesh network
- Signal is blocked due to low deploy elevation
- Lack of power supply consideration causes unsteady Mesh network.
In a word, failure caused by network structure design rather than devices.
Conclusion
Only need to finish 3 things to build a steady long range ( LoRa ) Meshtastic off-grid communication system respectively are LoRa devices + Mesh network structure + Stable power supply.
Maximum values of Meshtastic communication system:
- Independent of Internet or cellular net work.
- Autonomous communication system building.
- Low cost and strong expansibility.
This is also the reason why Meshtastic is becoming a hot technology in outdoor and emergency communication fields in the United States.
