LoRa boat monitor


The LoRa boat monitor is used to monitor the boat when it is absent. Various measured values are recorded continuously at 5-minute intervals and transferred to the LoRa radio technology (long range) LoRaWAN forwarded. The data is from the TTN server (The Thinks Network) received in Amsterdam and cached and then sent to Ubidots forwarded as a web frontend. The measured data is displayed in Ubidots and various notifications can be sent by email when measured values are exceeded. There are a large number of LoRa gateways which can receive the sent measurement data and forward it to the TTN server. The radio technology uses the license-free frequency range around 868 MHz and uses a special transmission technology (chirp) to achieve large ranges of up to 4 km. If no LoRa gateway is within range, another LoRa boat monitor can be used as a LoRa gateway. A different firmware is then used. Alternatively, the measured values can also be sent directly to Ubidots via WLAN, provided that a WLAN is within range.

Image: LoRa data transmission Semtech GmbH

Image: Block diagram LoRa boat monitor

The LoRa boat monitor has the following functions:

  • 12V supply voltage
  • 1.2W power consumption
  • LoRa transmitter and receiver with OLED display
  • 868 MHz, SF7… SF12, 100 mW transmission power
  • Feeding the data into The Thinks Network (TTN)
  • WLAN (2.4 GHz) for alternative data transmission
  • GPS sensor for geographic location coordinates
  • BME280 for measuring temperature, humidity and air pressure
  • 1x battery voltage measurement (service battery)
  • 1x potential-free alarm contact eg for bilge and door monitoring
  • 2x tank sensor (0… 180 Ohm)
  • 1x Reais output for potential-free switching of loads up to 3A (12V or 230V)
  • 2x 1Wire connection for temperature sensors DS18B20 for battery monitoring and refrigerator
  • Monitoring and alerting via Ubidots web frontend
  • Alerting by email if the limit value is exceeded
  • Automatic data storage for the last 31 days
  • Use of cheap embedded modules
  • No SMD components on the board
  • Board can be ordered here: https://aisler.net/p/TUFQWBEF

LoRa 32 Heltec radio module as the basis

LoRa gateway

Ubidot's web frontend with measured values and geodata

Circuit board for the boat monitor

Equipped panels (left LoRa boat monitor, right LoRa gateway)

LoRa boat monitor

Lora gateway