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WIRELESS SPEED CONTROL OF DC MOTOR USING RF
COMMUNICATION
ABSTRACT
Every system is automated in order to face new challenges in the present day situation.
Automated systems have less manual operations, so that the flexibility, reliabilities are high
and accurate. Hence every field prefers automated control systems. Especially in the field of
electronics automated systems are doing better performance.
The goal of the project is to develop a system, which uses RF communication to control the
speed of dc motor without any wired communication, which executes with respect to the
signal sent by the RF TX.
There are several applications with dc motors in our daily life. Obviously there exists many
applications where there might be a need to control the speed of dc motors. There exist many
ways of controlling the speed of DC motor. Of the available ones, PWM technique is the
most efficient one and the same technique is used here in this project.
According to this project the person who wants to control the speed of DC motor from a
distant place using RF TX. By pressing the keys available at the RF TX the speed of the DC
motor is varied by making use of the PWM technique. This is realized with the help of
microcontroller.

2. BLOCK DIAGRAM
TRANSMITTER SECTION
RF
TRANSMITTER
BATTERY KEYS ENCODER

3. RECEIVER SECTION
RF
RECIEVER
DECODER
Micro
Controller
AT89S52
POWER SUPPLY
LCD
DRIVER
DC
Motor