Resumen
The temperature in a room and air cleanliness level is very berpebgaruh on comfort those who are in it, one way to overcome this is to use the air circulation fan. But at this time there are still many fans who work in the conventional and still needed manpower to control the tool. It is considered less profitable, and often people forget to turn off the switch at the time of use, even though the fan is not in use. So will lead to wastage of electrical energy. If this continues to happen then it could be considered less effective and efficient. Research methods used in this research is descriptive method. Overall this tool is divided into blocks of circuit, input circuit, unit processes, output circuit. Input consists of a temperature sensor and a carbon dioxide sensor that is as giving orders to the unit to be processed and the process continues to block output. And which acts as the unit is a microcontroller atmega16 process. Output block that fan will rotate according parameter settings and the LCD as a viewer. The control system of air circulation is expected to be more efficient and to facilitate human work.Keyword : Automatic, Temperature Sensors, Carbon dioxide Sensors, ATmega16