Turning the fan can not only bring coolness but also make an automatic drying rack in combination with the water level sensor. It is very cute and has many applications.
Specifications
Connections: RJ11 4P4C
Power: 3.3V
Connections type: Analog output
You can find the introduction of this product following this link
https://wiki.elecfreaks.com/en/microbit/sensor/planet-x-sensors/Plant_X_EF05014