25-06-2012, 05:20 PM
RF BASED AUTOMATIC SPEED LIMITER FOR VEHICLES
RF BASED AUTOMATIC SPEED LIMITER FOR VEHICLES.doc (Size: 37 KB / Downloads: 91)
Objective:
The objective of this project is to control speed of the vehicle automatically with the help RF technology.
Scope:
This project is very useful to traffic police department. If the speed of the vehicle is over than limit value, the speed is automatically controlled. So this project is used to prevent the accident.
Brief Methodology:
This project is designed with RF transmitter and Receiver, Microcontroller, Encoder, Decoder, Proximity sensor, signal conditioning unit and Relay driver circuit with relay.
Many RF transmitters is placed in the emergency road and traffic rush areas. These RF transmitters are transmitting the speed limit value through the RF transmitter. The transmitter section consists of key pad encoder and RF transmitter. The key pad is used to set the speed limit value. Then the set value is given to encoder to encoded the signal and given to RF transmitter block in which the encoded signal is modulated with carrier frequency and transmitted through RF transmitter.
The receiver section consists of microcontroller RF receiver, Decoder, Proximity sensor and driver circuit for relay. The receiver section is attached in the vehicle. The proximity sensor is fixed in the vehicle wheel to monitor the speed. Proximity sensor is used detect the metals. The metal rod is fixed in vehicle. So whenever the rod is crossed the sensor it generates the pulse given to microcontroller. The microcontroller count that pulse and displayed on the LCD display which is equal to speed of the vehicle. The RF receiver is used to receive the speed limit value. The value is given to microcontroller through decoder. The RF receiver removes the carrier frequency and decoder is used to decode the signal then given to microcontroller.
In microcontroller the received speed limited value is compared with obtained speed. If the speed is higher then limits value it activates the relay through relay driver circuit. The relay output is connected petrol valve. So it controls the petrol flow to engine. Through this way the vehicle speed is automatically limited to speed level set the by traffic police department.