THE DESIGN AND CONSTRUCTION OF CAR CONTROLLER USING TELEMETRY SYSTEM
By
ANI SAMUEL EE/H2003/041
Presented To
Department of Electrical/Electronic Engineering
INTRODUCTION
The vehicle system control using telemetry application is all about using a radio wave to control and activate certain events such as the car horn, car head light, car ignition (starter) and car air conditioner etc.
This is achieved by using various tone frequencies by using an encoder via a radio frequency transmitter (low power) that provides the carrier frequency for these tones.
At the receiver end demultiplexing and decoding of these tone takes place via a detector/receiver stage. The output of the encoder is used to turn on a relay switch, which inturn connects power source to either the car engine, horn or lamp etc.
The application of thus project include space exploration, where lunar vehicles are controlled from earth station by using satellite as the medium of transfer of signals.
In the military warfare, unmanned air crafts, missiles and even armoured tanks are controlled these days by using the pinaple of telemetry applications. Other areas include GSM, where a subscriber has the total control of his telephone calls conversation through the BTS (Base Transmission or Transceiver Station). Its application are so vast and large that they are too numerous to mention.
TRANSMITTER
Transmitter is a device that process and possibly encode information, so as to make it suitable for transmission and subsequent reception. In a transmitter the information modulates the carrier. It superimposed an a light frequency since wave modulation varies from one system to another and may be high or low levels. Modulations is of three types amplitude modulation, frequency modulation and pulse modulation or combination of these.
FREQUENCY MODULATION:
Frequency modulation is a system in which the amplitude of the modulated carrier is constant while its frequency and rate of change are varied by the modulating signal. Frequency modulation is much more immune to noise than amplitude modulation noise vector is superimposed on the carrier.
RADIO WAVE
This is simply passing information via electromagnetic wave. Radio communicating use electromagnetic waves to carry information over long distances. These radio waves usually propagate through the earth’s atmosphere to places where they induces EMFs in the antennas of a distant receiver. The main modes of propagation are grand wave propagation sky wave propagation and space wave propagation.
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