8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 1/14

1/23/2011 1Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 2/14

1/23/2011 2Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 3/14

Ultrasonic System BasicsOne of the simplest and harmless

method.

Frequency used will be much above thehuman ear·s audible perception range is

(i.e20 Hz to 20kHz)

Uses ultrasonic transmitter andreceiver(40 kHz)

Uses pulse echo method for object 

detection.1/23/2011 3Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 4/14

Need ..

To get an awareness about circuit 

design

To get an idea about 

microcontroller

To get familiar with PCB design

Soldering practice

1/23/2011 4Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 5/14

Basic System Model

1/23/2011 5Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 6/14

BLOCK DIAGRAM DESCRIPTIONy Regulated power supply

y Microcontroller

y Devices

y LCD display

1/23/2011 6Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 7/14

Circuit diagram

1/23/2011 7Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 8/14

Circuit diagram explanationUltrasonic unit 

o Transmits a 40Khz sine wave and check

if it is received a high output is

produced.

Microcontroller

o Uses AT89S52o Port0Display

o Port1Relay driver

o Port3Input&LCD control

1/23/2011 8Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 9/14

Input sectiono Ultrasonic module-pin out 

o Low cost microcontroller used

Output section

o Relay drivers

o Relays

Devices

Power supply

o Regulated power supply of 5V

LCD display

o 12 pin 1nd 16 pin

1/23/2011 Dept. of Electronics&Communication, GECW 9

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 10/14

Workingy Transmitter sends burst of pulses into air.

y Receiver receives it and give it to the

microcontroller.

y Microcontroller calculates the time and displays

through the LCD.

1/23/2011 10Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 11/14

Applicationsy Automatic water tap

y Burglar alarm

y Interrupt finder for blinds

1/23/2011 11Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 12/14

FUTURE SCOPEThe range can be considerably increased by

using high power drive circuit.

Using temperature compensation, it can beused over wide temperature range.

Can be used as parking assistance system in

vehicles with high power ultrasonic

transmitter

1/23/2011 12Dept. of Electronics&Communication, GECW

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 13/14

CONCLUSIONUltrasonic switching control systems

can be very cost effective, easy tohandle, harmless and effectivemethod which can be implemented

for many useful applications.Effective use of the circuit can

make many application products.1/23/2011 Dept. of Electronics&Communication, GECW 13

8/7/2019 ultrasonic-final-main

http://slidepdf.com/reader/full/ultrasonic-final-main 14/14

1/23/2011 14Dept. of Electronics&Communication, GECW