M.Ehikhamenle, B.O. Omijeh
This project is based on the design and construction of an intruder detecting and alerting system. This was achieved using an AT89C52 microcontroller for the control of the other component, a SIM900-GSM module that communicates between the home owner phone and the PIR sensor (motion sensor). The interfacing between the GSM module and the microcontroller was achieved using an IC called MAX232 (this IC converts TTL voltage level (+5V) to RS232 voltage level (plus minus 7.5V) vice versa) and the microcontroller was programmed using assembly language. At the end of this project we were able to design and construct a device that is not only cheap but efficient. We overcome the problem of false alarm by using a PIR sensor (passive infrared: this sensor only respond to infrared emitted from the human body and animals) and after testing, the microcontroller responded to the information sent by the PIR sensor and in the occurrence of intrusion send an alert message to the home owner as well sounding an alarm to alert the neighbours using a buzzer.
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