automatic speed controlled car
Post on 07-Jul-2015
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AUTOMATIC SPEED CONTROLLED CAR
AUTOMATION FOR SAFETY
Submitted to
Md. Hasibul AlamLecturer, Department of EEE, BUET
Submitted by
0906166, 0906167, 0906168, 0906169,0906170, 0906171, 0906172, 0806027
OBJECTIVE:
• To design a car which will detect speed breakers and large obstacles and control its speed accordingly to avoid damages.
COMPONENTS:
• 2 Ultrasonic Sensors (HC- SR04)• 1 ATMEGA32A• 1 L293D Motor Driver• Switches• Resistors
COMPONENTS:
HC- SR04
• 2 sensors are used• Includes ultrasonic transmitter, receiver and control circuit• Upper one for large obstacles• Lower one for speed breakers
COMPONENTS:
HC- SR04
Wiring connections• 5V VCC• Trigger Pulse Input• Echo Pulse Output• Ground
COMPONENTS:
HC- SR04
The basic principle of work of HC - SR04 :• Using IO trigger for at least 10us high level signal,• The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.• IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning. Test distance (in meters)= (high level time ×velocity of sound (340M/S) /2•Distance in inches = Time / 148
OPERATION:
Speed Breakers:• If a car running at V m/s detects a speed breaker 2 feets away,
it reduces its speed to V/2 m/s• When the distance is 1 feet, its speed reduces to V/4 m/s
OPERATION:
Speed Breakers:• After crossing, the speed again increases to V m/s
OPERATION:
Large Obstacles:• If a large obstacle is detected, the car stops at 6 inches distance
CIRCUIT DIAGRAM:
Upper Sensor
Lower Sensor
LIMITAIONS AND SAFETY:
• L293D is heat sensitive, so operation can be hampered in case of large power drop
• Heat sink should be used in whole system
ADVANTAGES:
• Security from damages• Attractive for Electric Propulsion Motors• Effective in highly populated areas• Applicable for carrying goods in hospitals, industries, spaceships
etc.• Important feature for vehicles used for collecting informations
in areas men cannot reach
FUTURE APPLICATIONS:
• Addition of wi-fi device to communicate with other cars around to avoid collisions
• Addition of direction change systems
THANK YOU
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