ROBOT CAN BE CONTROLLED BY BEING ANYWHERE IN THE WORLD.

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2. WIRELESS CONTROLLED ROBOT
USING DTMF AND
MICROCONTROLLER
Done by:
Ch.Harish
Ch.Narendra
T.Bhanu prakash
T.Vishnu vardhan
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3. DTMF decoder
3.5mm audio cable (for connecting
mobile to DTMF module)
M-8870 decoder IC
AT89S52
Geared dc motors
Battery (10-12 v)
11.0592MHz crystal
L293D IC (motor driver)
Wheel for motors
BILL OF MATERIALS
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4. PROJECT OBJECTIVE
 To overcome the problem of NLOS and range
problems Approach Using mobile Technology.
 Control the robot movement being
anywhere in the world.
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5. BLOCK DIAGRAM
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6. DESCRIPTION OF BLOCK DIAGRAM
 Cell phone controlled robots are used to operate
the robot by using cell phone. By connecting cell
phone to the circuit the cell phone can controlled
robot through the by the keypad of cell phone.
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7. CELL PHONE
 Cell phones are used to give the instruction to the
robot by pressing the keypad of the cell phone.
 The output of the cell phone controls the robot.
 By generating dual tone, the dual tone is given to
the DTMF decoder;
 Decoder decodes the frequency into digital data and
controls the robot.
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9. DTMF RECEIVER SECTION
 DTMF receiver section is used to receive the dual
tone coming from the cell phone.
 It is received by the DTMF and decoded by the
same DTMF IC and given to the microcontroller.
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10. This DTMF (Dual Tone Multi Frequency) decoder circuit
identifies the dial tone from the telephone line and
decodes the key pressed on the remote telephone.
It employs electronics and computers to support
switching operations. DTMF is the ultimate technique
used in any of the Mobile, Telephone communication
systems.
DTMF DECODERWORKING
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11. MICROCONTROLLER
 Microcontroller will receives the decoded digital
data based on received data.
 Controller is going to control the robot giving
control signal to the motor driver.
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12. Motor Driver ICs are primarily used in autonomous
robotics only because microcontrollers couldn’t
supply high current and voltage to motors.
We have used L293d ic because it can control 4
motors at atime
DRIVER IC
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13. CIRCUIT DIAGRAM
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14. In this project I have used only 5 keys; they
are:
2 (for forward movement)
4 (for moving left)
5 (for stopping the robot)
6 (for moving right)
8 (for backward movement)
PROJECTWORKING
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15. Military and Law Enforcement
Search and Rescue
Scientific
Home appliance control
APPLICATIONS
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16. FUTURE IMPROVEMENT
&
SCOPE
 IR Sensors
 Password Protection
 Alarm Phone Dialer
 Adding a Camera
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