11-01-2024 LoRa notes (open for editing)
Radio transceivers have always sparked my interest. Many years ago, I obtained my amateur radio license, and then more recently became interested in programming micro controllers and single board computers. I discovered Adafruit Feather boards that contained LoRa transceivers within the ham radio spectrum of 70cm. Thus began my journey into the topic of LoRa.
LoRa stands for ‘long range’ and is a low power communications protocol. Frequency Shift (Compressed High Intensity Radar Pulse (CHIRP) ) Modulation (FSCM)
Open System Interconnection (OSI) Reference Model
7) Application
6) Presentation
5) Session
4) Transport
3) Network
2) Data Link
1) Physical -- LoRa
Based wireless networking standard
SF = Spreading Factor (7 – 12)
LoRa Frame
Preamble is at start of every frame (repeated and known as the base chirp)
Packet
-------------------------------------------------------------------------------------------------
LoRa Physical Layer
--------------------------------------------------------------------------------------------------
Preamble Sync message Payload CRC (only in uplink)
8 symbols 2 symbols
---------------------------------------------------------------------------------------------------
End of blog. Thank you for reading!
Back to Homepage