Abstract: In order to mitigate overheated interior of a vehicle parked in the hot summer sun and thereby to make the entering into the vehicle more comfortable, microcontroller manŽaged module for automatic ventilation of vehicle interior is made. The module is implemented using a microconŽtroller as a central logical unit and a series of sensors which provide sufficient data to ensure functional, but also efficient, reliable and safe ventilation. The ventilaŽtion process is performed by opening vehicle windows slightly, which enables air to circulate. Microcontroller controls the position of the windows autonomously and independently of the driver’s presence, following preŽdefined algorithm that uses sensors data obtained from the vehicle’s surroundings. Besides temperature, the most important factors to ensure quality implementation of ventilation are detected moveŽments around the vehicle, the presence of precipitation and other. This paper shows the components, their purŽpose and capabilities, advantages and disadvantages, as well as potential implementations and upgrades. The test results give insight into utilization options of this module and its usefulness. This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

Keywords: Self-Regulated Automatic Ventilation, Vehicle Interior, Microcontroller, three terminal voltage regulator.