Calibrating the humidity sensor
We compared three cheap sensors against a reference hygrometer over two weeks. The cheapest drifted by 4% after rain; the other two stayed within 1.5%.
Short notes from a small team that builds weather stations for schools.
We compared three cheap sensors against a reference hygrometer over two weeks. The cheapest drifted by 4% after rain; the other two stayed within 1.5%.
December gives us about a fifth of June's yield. A 20 W panel and a 12 Ah battery kept the station running through the darkest week last year.
One-minute logging filled the cards in a month and told us nothing more about the afternoon storms than five-minute samples did.