Ultrasonic range finder using 8051


Posted on Feb 5, 2014

A simple ultrasonic range finder using 8051 microcontroller is presented in this article. This ultrasonic rangefinder can measure distances up to 2. 5 meters at an accuracy of 1 centi meter. AT89s51 microcontroller and the ultrasonic transducer module HC-SR04 forms the basis of this circuit. The ultrasonic module sends a signal to the object, then


Ultrasonic range finder using 8051
Click here to download the full size of the above Circuit.

picks up its echo and outputs a wave form whose time period is proportional to the distance. The microcontroller accepts this signal, performs necessary processing and displays the corresponding distance on the 3 digit seven segment display. This circuit finds a lot of application in projects like automotive parking sensors, obstacle warning systems, terrain monitoring robots, industrial distance measurements etc. HC-SR04 is an ultrasonic ranging module designed for embedded system projects like this. It has a resolution of 0. 3cm and the ranging distance is from 2cm to 500cm. It operates from a 5V DC supply and the standby current is less than 2mA. The module transmits an ultrasonic signal, picks up its echo, measures the time elapsed between the two events and outputs a waveform whose high time is modulated by the measured time which is proportional to the distance. . The photograph of an HC-SR04 module is shown below. The supporting circuits fabricated on the module makes it almost stand alone and what the programmer need to do is to send a trigger signal to it for initiating transmission and receive the echo signal from it for distance calculation. The HR-SR04 has four pins namely Vcc, Trigger, Echo, GND and they are explained in detail below. 2)Trigger: The trigger signal for starting the transmission is given to this pin. The trigger signal must be a pulse with 10uS high time. When the module receives a valid trigger...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    LF Exciter using I2PHD/IK2CZL JASON
    Active Noise-Canceling Headphones
    RF Amplifier circuit with 2SC1970 2N4427 Schematic Diagram
    rear wheel tachometer
    analog to digital converter
    Telephone in use indicator
    RS485 Communication Connectors
    Acoustic Sensor
    Automatic lighting control telephone signals



    Top