How it works

The raspberry takes a picture — North oriented — each hour (I can remotely launch command using voice and get raspberry statement on smartphone using RaspController) and then filters the pic (labels: Pink, Magenta). The difference between the two determines the light exposition, increasing or decreasing. The sensor switches blue or red

Pressure Temperature Humidity
1001.98 mbar 18.5 °C 47.97 %

It communicates through Openweathermap to display on the micro:bit the current forecast (Clouds)

The distant micro:bit counter is set to -1 when it switches to red (the speaker plays a sound) and +2 when it swithes to blue (+5)