Ultrasonic Distance Meter
ConstruCtion
microcontroller-based
Ultrasonic distance meter and receiver), current buffer ULN2003, operational amplifier LM324, inverter here are several ways to measCD4049, four 7-segment displays, five ure distance without contact. transistors and some discreet comOne way is to use ultrasonic ponents. The ultrasonic transmitterwaves at 40 kHz for distance measurereceiver pair is shown in Fig. 1. ment. Ultrasonic transducers measure
Ultrasonic generators use piezothe amount of time taken for a pulse of electric materials such as zinc or lead sound to travel to a particular surface zirconium tartrates or quartz crystal. and return as the reflected echo.
The material thickness decides the
This circuit calculates the distance resonant frequency when mounted based on the speed of sound at 25°C and excited by electrodes attached on ambient temperature and shows it either side of it. The medical scanners o n a 7-segment display. Using it, used for abdomen or heart ultrasound you can measure distance up to 2.5 are designed at 2.5 MHz. In this cirmetres. cuit, a 40kHz transducer is used for
For this particular application, the measurement in the air medium. The required components are AT89C2051 velocity of sound in the air is around microcontroller, two 40kHz ultrasonic
330 m/s at 0°C and varies with temtransducers (one each for transmitter perature. 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. Fig. 2 shows the transmitted burst, which lasts for a period of approximately 0.5 ms. It travels to the object in the air and the echo signal is picked up by another ultrasonic
Fig. 1: Ultrasonic transmitter and receiver pair transducer unit (receiver), also a 40 kHz pre-tuned unit. The received signal, which is very weak, is amplified several times in the receiver circuit and appears somewhat as shown in Fig. 2 when seen
microcontroller-based
Ultrasonic distance meter and receiver), current buffer ULN2003, operational amplifier LM324, inverter here are several ways to measCD4049, four 7-segment displays, five ure distance without contact. transistors and some discreet comOne way is to use ultrasonic ponents. The ultrasonic transmitterwaves at 40 kHz for distance measurereceiver pair is shown in Fig. 1. ment. Ultrasonic transducers measure
Ultrasonic generators use piezothe amount of time taken for a pulse of electric materials such as zinc or lead sound to travel to a particular surface zirconium tartrates or quartz crystal. and return as the reflected echo.
The material thickness decides the
This circuit calculates the distance resonant frequency when mounted based on the speed of sound at 25°C and excited by electrodes attached on ambient temperature and shows it either side of it. The medical scanners o n a 7-segment display. Using it, used for abdomen or heart ultrasound you can measure distance up to 2.5 are designed at 2.5 MHz. In this cirmetres. cuit, a 40kHz transducer is used for
For this particular application, the measurement in the air medium. The required components are AT89C2051 velocity of sound in the air is around microcontroller, two 40kHz ultrasonic
330 m/s at 0°C and varies with temtransducers (one each for transmitter perature. 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. Fig. 2 shows the transmitted burst, which lasts for a period of approximately 0.5 ms. It travels to the object in the air and the echo signal is picked up by another ultrasonic
Fig. 1: Ultrasonic transmitter and receiver pair transducer unit (receiver), also a 40 kHz pre-tuned unit. The received signal, which is very weak, is amplified several times in the receiver circuit and appears somewhat as shown in Fig. 2 when seen