We are a team of three French students from Orléans university, working during three months with a Norwegian student at Østfold University College in Fredrikstad on a project based around the Internet of Things.
Our project is about wirelessly sending light and temperature data from sensors distributed around a solar panels field, to a receiver located at its center a few hundred meters away. The data is then sent by ethernet on a storage server, and it can be consulted through a website.
Field application schematic
Since this setting doesn’t require much bit rate, the best wireless solution was to use one of the newly developed Low Power Wide Area Network device: LoRaWAN
Semtech’s LoRa shield transmitter
LoRa is a technology patented by Semtech which utilizes Chirp Spread Spectrum to send data. Its robustness against interferences allows for long range communications while having a low power consumption, making it the ideal solution for low bit rates off-grid transmitters. The goal of our project is to demonstrate LoRaWAN usefulness and explain its inner workings.
If you would like to learn more about LoRa, this video goes in more details: