How it works

The raspberry takes a picture — North oriented — each hour (I can remotely launch command using voice) and then filters the pic (labels: Room, Interior design, Wall, Furniture, Floor, Design, Architecture, House, Daylighting, Window). The difference between the two determines the light exposition, decreasing or increasing. The sensor switches blue or red

Pressure Temperature Humidity
1012.97 mbar 17.6 °C 43.01 %

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 [+3]

To control what the embed software measures, I use the micro:bit electronic light sensor [+3]. The difference between the two micro:bit counters represents the inflexion point [0]

To get the most accurate inflexion point, I’d first planed to use the Pan-Tilt Hat move with the 160° night vision camera to capture light source from both north and north-east. But I didn’t succeed to change the angle (the module is perhaps broken). So I put it in a fixed position, and I will move the plant manually to have a shadow on the picture until I get the better result [0] at 8:00 am