Aquarium water temperature is measured using water temperature sensor. Sensor is based on Texas Instruments LM35 chip. Controller will activate water heater or cooling fan block when water temperature drops down or rises. Thus controller will support constant aquarium temperature, set by user. User also can set low and high water temperature alarm limits. Controller will generate alarms when these limits will be exceeded.
Rotating fan block fan can be noisy, especially if you are going to sleep and the air in the aquarium room is hot. In this case fans can be turned off at particular time interval. In the angry Fish application you can set time interval at which fan block will be disabled even if aquarium temperature is high.