I made this project because I wanted a way to automatically control the speed of ... a 9V battery to provide power to the fan and transistor. The LM35 temperature sensor and red led are powered with ...

Attached to the servo horn is a slotted cylinder sized appropriately to fit the shape of the control knob. An Arduino measures the temperature of the room via a DS18B20 temperature sensor which ...

Maintaining water temperature ... A thermocouple sensor stuck through the grill gives the reading of the air inside, and an Arduino nearby reads that and adjusts the vents and fans accordingly.