25-08-2017, 09:32 PM
Abstracts: This Project describes a design of effective fire alarm system with four different sensors. This system is built around the AT89S52 micro controller from Atmel. This micro controller provides all the functionality of the system. A maximum of 8 sensors can be connected. It dials a mobile number which is already programmed into the system. A mobile number or a land line number can be programmed into the system. Also it can dial the number even the subscriber is out of station. 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.