A LoRa sensor network in the cerrado
Five battery-powered Heltec V3 nodes measured air temperature, humidity and pressure in a cerrado fragment on the UFSCar campus in São Carlos, Brazil. Each node sends one LoRa packet per hour to a gateway 70 to 150 m away, which stores it through this API. The goal is to learn what a cheap, solar-free node survives in the field, and how close its readings sit to the INMET A711 weather station next door.
Three field campaigns ran between April and July 2026. Every reading below comes from the same public API that the gateway writes to. The code, the raw data and the analysis live on GitHub.
Live network
The map holds every fixed point of the deployment. A node turns green when its last packet is recent, ochre when it is a few hours old, and hollow grey when it stopped reporting.
Loading the latest readings…
Replay the campaigns
Pick a campaign and drag the slider through its hours. Each marker shows the reading nearest to the cursor, and fades out when the node has nothing to report.
A slate marker means the node reported, but its sensor was faulty.