11001-Me Ultrasonic Sensor

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Sommaire

[modifier] Documentation

http://learn.makeblock.com/en/me-ultrasonic-sensor/

Me Ultrasonic Sensor is an electronic module to measuring distance in the range of 3cm to 400cm. It can be used for the projects to help the handcart avoid obstacles or other relevant distance-measuring and obstacle avoidance projects.

[modifier] Spécifications techniques

  • Operating voltage: 5V DC
  • Measurement angle: 30 degree
  • Measurement range: 3-400cm (with error less than 1cm)
  • Ultrasonic frequency: 42 KHz
  • Control mode: Single-digital port control
  • Module size: 56 x 36 x 31 mm (L x W x H)
  • Connecting with RJ25

[modifier] Programmation Arduino

This is a routine to instruct the module for distance measurement through Arduino programming. Me Ultrasonic Sensor-Arduino.png

[modifier] Programmation Scratch

This program can make the panda speak out the distance detected by Me Ultrasonic Sensor. Me Ultrasonic Sensor-Scratch.png

[modifier] Fichier d'exemple

Fichier:MesureToutesLesDeuxSecondes.sb2

[modifier] Principle analysis

The Me Ultrasonic Sensor comes with two “eyes”, one of which (marked with T) is an ultrasonic transmitter, the other of which (marked with R) is an ultrasonic receiver. The ultrasonic transmitter launches ultrasonic wave in a direction and start time-keeping at the launch. The ultrasonic wave spreads in the air, returns back immediately when meeting obstacles in the way, and stops time-keeping immediately when the ultrasonic receiver receives the reflected wave. The transmission speed of sonic wave in the air is 340 m/s. Use the time t recorded by the timer to calculate the distance s from the launching point to the obstacle, that is, s=340×t/2.

[modifier] Schematic

http://learn.makeblock.com/en/wp-content/uploads/2016/01/Me_Ultrasonic_V3.0.png

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