DESIGN AND CONSTRUCTION OF A SECURITY LIGHTING AND INTRUDER DETECTION SYSTEM

ABSTRACT

This report presents the design and construction of a system that can detect intruders, send an SMS after detecting and serves as a good lighting source. The aim of the project is to design and construct a security lighting and intruder detection system. The circuit diagram for the system was designed and simulated using Proteus 8 professional. The construction was achieved by using a buck converter to convert the voltage obtained from the battery (11.1v) to 5v needed by the ESP32, PIR sensor, LDR sensor, LED module and 3.4v needed by the SIM800L module. The ESP32 waits for the SIM800L to be connected to a network before it establishes a connection with the SIM800L through the UART (Universal Asynchronous Receiver Transmitter) communication protocol. The microcontroller takes analogue readings from the sensor and converts them to digital values through its internal ADC(Analogue-to-Digital converters) before processing the values. If the output from the LDR sensor is greater than the preset value, the ESP32 turns on the LED module. The LED module can also be turned on with a push button. The PIR sensor can only be turned on by pressing a switch. When the PIR sensor is turned on, it sends a digital signal to the ESP32 which then instructs the SIM800L to send an SMS. The content of the SMS is “MOTION DETECTED”. The microcontroller instructs the SIM800L to send an SMS everytime motion is detected till the PIR sensor is turned off. All of these were achieved by programming codes into the microcontroller which was created using the Arduino IDE. The software was compiled after it was developed and was uploaded to the ESP32 via a USB data connection after successful compilation. At the end of the project, a system that serves as a Security lighting and intruder detection system that can detect intruders and alert the proper authorities via SMS was designed and constructed. The system can be turned ON and OFF effectively with a switch, the PIR sensor is turned ON using the red button, the green led should go off indicating the PIR sensor is on. The result obtained from the tests proved that the system was able to send an SMS over a long range.