Automation has created a bigger hype in the electronics. The major reason for this hype is automation provides greater advantages like accuracy, energy conversation, reliability and more over the automated systems do not require any human attention. Any one of the requirements stated above demands for the design of an automated device. The energy conversation is very important in the current scenario and should be done to a maximum extent where ever it is possible. Energy can be effectively conserved if we can control the traffic lights on the highways by glowing them according with time delay. So in this situation we should think about a system which is capable of sensing the traffic density and automatically should manage to control the traffic levels by increasing the time delay for the green signal to the roads which are with heavy traffic.

The main aim of the project is to design an automatic traffic signal control system based on present traffic density along with traffic signal controlling through android smart phone that is allowed only for ambulance drivers to clear the path. In this project, when more vehicle density is identified by the IR sensors in a particular side, then green light gets ON automatically. It remains in ON state for a predefined amount of time. After the predefined amount, the signal turns to red. Whenever driver finds more traffic in the moving route, he will send message to the Bluetooth module which is connected to micro controller with android mobile that will be given to the microcontroller which changes the traffic signal according to the message from RED to GREEN by running embedded programming. Bluetooth is an open standard specification for a radio frequency (RF)-based, short-range connectivity technology that promises to change the face of computing and wireless communication. It is designed to be an inexpensive, wireless networking system for all classes of portable devices, such as laptops, PDAs (personal digital assistants), and mobile phones. It also will enable wireless connections for desktop computers, making connections between monitors, printers, keyboards, and the CPU cable-free.            This project uses regulated 5v, 500mA power supply. 7805, a three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of 230/12 step down transformer.  

   

The project provides learning’s on the following advancements:  

1. Interfacing Bluetooth.
2. LED Indicator.
3. Conversion of AC supply to DC supply.
4. Android application.
5. IR sensor.
6. Embedded C programming.
7. PCB designing.

  The major building blocks of this project are:

1. Regulated Power Supply.
2. PIC Microcontroller.
3. Bluetooth module.
4. Traffic lights.
5. IR sensors.
6. Crysta.
7. Reset.
8. LED Indicators.

  Software’s used:  

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Micro controller.
3. Express SCH for Circuit design.

      Regulated Power Supply:  

Block diagram:

video: