Key Components
Arduino Micro
Bosch BMP390 barometric pressure sensor
RS485 transceiver
Rain drop sensor module
This project was born more out of the need to have a Modbus slave device for testing than the need to have a weather station, but frequent afternoon rain showers combined with the fact that I don't have a dryer meant that having an indication that rain was imminent would give me enough heads-up to be able to go and fetch the clothes off the line before the heavens opened up.