12-12-2012, 06:48 PM
Microcontroller based Ultrasonic distance meter
Microcontroller based Ultrasonic.pptx (Size: 129.5 KB / Downloads: 45)
Role Of Project:
There are several ways to measure distance without contact.
One way is to use ultrasonic waves at 40 kHz for distance measurement.
Ultrasonic transducers measure the amount of time taken for a pulse of sound to travel to a particular surface and return as the reflected echo.
This circuit calculates the distance based on the speed of sound at 25°C ambient temperature and shows it on a 7-segment display.
Using it, you can measure distance up to 2.5 metres.
Method Proposed:
The project is going to be done using
Micro-controller AT89C2051
Two 40kHz ultrasonic transducers
Current buffer ULN2003
Operational amplifier LM324
Inverter CD4049
Four 7-segment displays
Five transistors and some discreet components.
Ultrasonic generators use piezoelectric materials such as zinc or lead zirconium quartz crystal.
The material thickness decides the resonant frequency when mounted and excited by electrodes attached on either side of it.
The medical scanners used for abdomen or heart ultrasound are designed at 2.5 mhz. In this circuit, a 40kHz transducer is used for measurement in the air medium.
In this project, you excite the ultrasonic transmitter unit with a 40kHz pulse burst and expect an echo from the object whose distance you want to measure.
Time Schedule:
By the end of September’2012, the 128x64 Graphics LCD will be interfaced with the microcontroller and fuel level sensor assembly will be completed.
By the end of October’2012, the temperature and the fuel level as well as door status will be shown on LCD.
By the end of December’2012, the speed measurement section will be completed.
By the end of January’2013, the total hardware as well as software work will be done.
Current Status:
Collected information about how the different parameters will be measured.
Purchased currently requiring components.
Working on Fuel level sensor assembly and LCD interfacing.