Homemade SONAR - Arduino

SONAR - used in huge ships to find the depth of sea, i have made a very similar SONAR which can measure distance in centimetres, metres and inches.

    PIR motion sensor      : https://youtu.be/okTuu37W_aY

      8x8 LED matrix          : https://youtu.be/nRNtcOW02BE

  Ultrasonic distance       :https://youtu.be/LeYqUCMg940

AWESOME 12 LED chaser :https://youtu.be/aKW-DGTEMYY

    simple led chaser        :https://youtu.be/M6nrgeojfkA

... https://www.youtube.com/watch?v=6HFdbaAh1k0