Methodology

Week7

Diagram explanation

Figure 4

The circuit that I design are based on the Microcontroller subject that I have learned in Unikl BMI. Microcontroller unit in this diagram are using the PIC16F877A which means it has the 40pin IC and 4 port. The Microcontroller are as the main circuit that control the GSM module circuit and power unit of the car as Figure 4 shown above: http://tjournal.org/tjst_november_2012/4.pdf

First, the power supply are taken from the main power of the car. The output for current are connected to the microcontroller system to turn on the microcontroller PIC16F877A. The GSM module are powered by using the car system and it connected at the input of microcontroller. Sensor are using in this circuit, the 2 sensor that are used are at the doors and boot of the car that are connected to the input for microcontroller.  For the output for the microcontroller, it connected to the main switch (key switch) for the car and alarm system. The key switch is functioning to turn off when it gets the signal form GSM system and react to the microcontroller and will demobilize the overall car system. In the other word, it will shut down the overall wiring system that is used to operate the car. 

The operation system

Figure 5: Overall Ignition System Car

First, the power supply from car battery is connected to the microcontroller and GSM module that is in the red colour box as represent the relay.. When the car are stolen, the owner will sent the text message to the GSM module. Then, the GSM will react and give data to the Microcontroller. Microcontroller will trigger the switch that connected to the sensor and alarm system. The alarm will start to turn ‘ON’. While the alarm on, the microcontroller also trigger the switch that connected to key switch that are functioning to demobilize the overall current to the ignition system as shown in Figure 5 above : http://www.ripper1.com/tech/wiring.php

After demobilize, the Microcontroller needs to wait another text message from the car owner to immobilize the car back. After receiving the text message, the car will operate normally and the thief is being captured.