The project is split into two halves

1. the remote AIS receiver/repeater which will be located on a nearby hillside and repeat AIS messages via LoRa back to the base station.
2. the base station, which will receive the LoRa messages and reconstruct AIS sentences onto the local network, for consumption by local chartplotter, MarineTraffic.com etc

Remote Receiver:

dAISy AIS receiver sends AIS sentences over serial data link to Teensy Microcontroller.

Teensy controller compresses and packetises AIS sentences and transmits them over LoRa data link.

System is powered from 3.7v 2x18650 Li-Ion battery, charged by Sparkfun SunnyBuddy controller and 10W 12V solar panel

Teensy is also responsible for monitoring battery state-of-charge and putting system to sleep if insufficient charge

Base Station

HopeRF module connected to Raspberry PI receives messages over 433MHz LoRa link and reconstructs AIS sentences. AIS sentences then sent over local network to any suitable receiver/chartplotter/AIS service. Telemetry from remote receiver (battery voltage, whether active or sleeping etc) is also received on the Raspberry Pi and logged to the cloud via TheThingsNetwork HTTP API