Reed Sensors for Fridge and Refrigerator

1 Door control
A Reed Sensor or PCB mounted Reed Switch detects via a Magnet
in the door when the door is opened. A light is switched on then.
In addition some time counter can be activated to give an alarm
signal if the door stays open for a certain time.
2 Fan control
Some bigger refrigerators or wine coolers are using fans on the
inside to distribute chilled air within the cooling chamber. These
fans can be switched off when a door opens (controlled by Reed
Sensor and Magnet) to prevent blowing cold air or particles into
to the users face.
3 Water level control for automatic ice cube makers
Modern refrigerators do offer automatic ice cube makers. Those
need to have a water tank. The water level inside the thank can be
checked with either a float with an magnet inside and the Sensor
outside or with a conventional Level Sensor within the tank. If the
water level drops below a certain point a warning will be issued
and the machine will stop producing ice cubes.