week 3: HOME SECURITY ALARM..^_^..

                            IntroduCtion

  MODEL

  

   

  Our "HOME SECURITY ALARM " consist of a combination of a two circuits ultra sonic sensor and ic timer circuit.We are approach to make a changes in that project especially for its function.

          Ultrasonic circuit is to detect any movement especially detect intruders and alerts will be sent to the timer circuit to trigger the siren in a timely manner. In our ultasonic circuit using a relay to trigger movement and CMOS IC and TL 084 as converters and amplifer. We chose the time constant circuit with a relay to trigger the siren off.

          In both are use the power supply 12VDC for Utrasonic and 9VDC for timer circuit based on the properly DC circuit. With the support of the appropriate components of both these circuits will function as sensors to detect intruders. Siren used was a police siren that use 12VDC to produce a loud sound to be heard by the neighbors and people will invasion.