Chapter · LoRa
The signal
What LoRa is for, a symbol as a chirp, and what the spreading factor trades.
- 01Small messages over a longer link4 minA LoRa radio is built to send a few bytes now and then, a long way, on a battery. This lesson sets the job on one Australian farm and shows what a six byte soil report costs in time on the air, and why that is the price that matters.
- 02The chirp is the symbol4 minA LoRa symbol is a tone that sweeps across the whole band, starting at one of a fixed set of points. This lesson plots one symbol, frequency against time, and shows what shifting the start does and where it wraps.
- 03Spreading factor: time and sensitivity4 minEach step up in spreading factor doubles the time of a symbol and lets the receiver read a weaker signal, by about two and a half decibels. This lesson shows the cost in airtime and why it is not a promise of range.
Start at 01 and read down — the order is the order things get easier in. Or take the one with your part in it; every article stands on its own, and links back to whatever it needs.