ULTRASONIC RADARULTRASONIC RADAR

AIM OF THE PROJECTAIM OF THE PROJECT

NON CONTACT MEASUREMENT OFNON CONTACT MEASUREMENT OF

DISTANCE OF AN OBJECT USINGDISTANCE OF AN OBJECT USING

ULTRASOUNDULTRASOUND

OBJECTIVES OF THE PROJECT

To design a handy device for non-contact measurement of distance.

For measurement of shorter distances only.

Using a microcontroller for better understanding of its functioning.

Less cost manufacture.

ULTRASOUND ???

These are waves of frequency greater than 20KHz.

They travel with velocity of sound.

Because of shorter wave length they travel as sharp beam.

They undergo reflection.

BLOCK DIAGRAM

PIC 16F72MICROCONTROLLER

FND SCREEN

TRANSDUCERDRIVER CIRCUIT

ULTRASONICTRANSMITTER

ULTRASONICRECEIVER

AMPLIFIER

ENVELOPEDETECTORCOMPARATORSIGNAL

HOLDINGCIRCUIT

THRESHOLDVOLTAGE = 0.4V

KEYPAD

INTERNAL STRUCTURE OF ULTRASONIC TRANSDUCER

TRANSMITTER

TRANSMITTERTRANSMITTER

RECEIVER

OPERATIONAL AMPLIFIERSOPERATIONAL AMPLIFIERS

1010

1002

k

kR

RA

i

f

10001001021 AAA

dBAAdB 601000log20log20

ENVELOPE DETECTORENVELOPE DETECTOR

COMPARATORCOMPARATOR

ba

ccbref RR

VRV

MRa 1

kkRb 4751.46

= 0.4V

SS RR QQ QQ`̀

RemarkRemark

00 00 11 11 IllegalIllegal

00 11 11 00 SetSet

11 00 00 11 ResetReset

11 11 QQ QQ`̀Previous Q statePrevious Q state

SIGNAL HOLD CIRCUIT

CCP

1.5ms

RA5 enable output pin goes high

PIC & LED INTERFACE

PROCESS EXPLANATION

FLOW CHARTFLOW CHART

CAPTURE PROCESS

THE LED DISPLAYTHE LED DISPLAY

7 SEGMENT COMMON ANODE

LED INTERFACELED INTERFACE

APPLICATIONSAPPLICATIONS

Robotics & AutomationRobotics & Automation Car backing SystemCar backing System ExplorationExploration

FURTHER DEVELOPMENTFURTHER DEVELOPMENT

Assistance for the blindAssistance for the blind Velocity meterVelocity meter Long range and short range mode Long range and short range mode

selection.selection. PC interface.PC interface. Periphery mapper.Periphery mapper.