Unlocking precise time synchronization across a fleet of sensors
summary
Claim: LoRaWAN Class B achieves sub‑microsecond fleet sync proven in experiments under 600 ns across devices; beacons arrive every 128 s and gateway PPS drives deterministic timing. Implementation uses GNSS PPS where available, otherwise Wi‑Fi/Bluetooth or LoRa 2.4; on-device code timestamps the transceiver DIO pin RX done pulse, corrects drift at each beacon, and handles propagation delay. Tradeoffs: Class B setup latency ≈130 s, beacon channel planning, and gateway placement; deployed bridge and industrial monitors work with these constraints.
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chapters (8)
- 0:00Introduction
- 0:43Key applications
- 3:08Wireless sensors need precise timing
- 6:38Selecting synchronization tech
- 8:03LoRaWAN Class B timing
- 9:51Measuring RF delay
- 11:38Class B setup challenges
- 12:42Industrial applications
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