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Grove - Ultrasonic Ranger

This Grove - Ultrasonic ranger is a non-contact distance measurement module which works at 40KHz. When we provide a pulse trigger signal with more than 10uS through singal pin, the Grove_Ultrasonic_Ranger will issue 8 cycles of 40kHz cycle level and detect the echo. The pulse width of the echo signal is proportional to the measured distance. Here is the formula: Distance = echo signal high time * Sound speed (340M/S)/2. Grove_Ultrasonic_Ranger's trig and echo singal share 1 SIG pin.

Warning

Do not hot plug Grove-Ultrasonic-Ranger, otherwise it will damage the sensor. The measured area must be no less than 0.5 square meters and smooth.

Version

Product Version Changes Released Date
Grove-Ultrasonic ranger V1.0 Initial Mar 2012
Grove-Ultrasonic ranger V2.0 Improve the power stability with low-voltage main board with below changes: 1. Added an capacitance C14 2. Redesigned the layout to make it more tidy 3. Compatible with 3.3V voltage system July 2017

Specification

Parameter Value/Range
Operating voltage 3.2~5.2V
Operating current 8mA
Ultrasonic frequency 40kHz
Measuring range 2-350cm
Resolution 1cm
Output PWM
Size 50mm X 25mm X 16mm
Weight 13g
Measurement angle 15 degree
Working temperature -10~60 degree C
Trigger signal 10uS TTL
Echo signal TTL

Tip

More details about Grove modules please refer to Grove System

Platforms Supported

Arduino Raspberry Pi BeagleBone Wio LinkIt ONE

Caution

The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Getting Started

Note

If this is the first time you work with Arduino, we firmly recommend you to see Getting Started with Arduino before the start.

Play With Arduino

Hardware

  • Step 1. Prepare the below stuffs:
Seeeduino V4.2 Base Shield Grove - Ultrasonic Ranger
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  • Step 2. Connect Ultrasonic Ranger to port D7 of Grove-Base Shield.
  • Step 3. Plug Grove - Base Shield into Seeeduino.
  • Step 4. Connect Seeeduino to PC via a USB cable.

Note

If we don't have Grove Base Shield, We also can directly connect Grove_Ultrasonic_Ranger to Seeeduino as below.

Seeeduino Grove-Ultrasonic Ranger
5V Red
GND Black
Not Conencted White
D7 Yellow

Software

#include "Ultrasonic.h"

Ultrasonic ultrasonic(7);
void setup()
{
    Serial.begin(9600);
}
void loop()
{
    long RangeInInches;
    long RangeInCentimeters;

    Serial.println("The distance to obstacles in front is: ");
    RangeInInches = ultrasonic.MeasureInInches();
    Serial.print(RangeInInches);//0~157 inches
    Serial.println(" inch");
    delay(250);

    RangeInCentimeters = ultrasonic.MeasureInCentimeters(); // two measurements should keep an interval
    Serial.print(RangeInCentimeters);//0~400cm
    Serial.println(" cm");
    delay(250);
}
  • Step 4. We will see the distance display on terminal as below.
The distance to obstacles in front is:
2 inches
6 cm
The distance to obstacles in front is:
2 inches
6 cm
The distance to obstacles in front is:
2 inches
6 cm

Play With Raspberry Pi

Hardware

  • Step 1. Prepare the below stuffs:
Raspberry pi GrovePi_Plus Grove - Ultrasonic Ranger
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  • Step 2. Plug the GrovePi_Plus into Raspberry.
  • Step 3. Connect Grove-Ultrasonic ranger to D4 port of GrovePi_Plus.
  • Step 4. Connect the Raspberry to PC through USB cable.

Software

  • Step 1. Follow Setting Software to configure the development environment.
  • Step 2. Git clone the Github repository.
cd ~
git clone https://github.com/DexterInd/GrovePi.git
  • Step 3. Excute below commands to use the ultrasonic_ranger to meansure the distance.
cd ~/GrovePi/Software/Python
python grove_ultrasonic.py

Here is the grove_ultrasonic.py code.

# GrovePi + Grove Ultrasonic Ranger

from grovepi import *

# Connect the Grove Ultrasonic Ranger to digital port D4
# SIG,NC,VCC,GND

ultrasonic_ranger = 4

while True:
    try:
        # Read distance value from Ultrasonic
        print ultrasonicRead(ultrasonic_ranger)

    except TypeError:
        print "Error"
    except IOError:
        print "Error"
  • Step 4. We will see the distance display on terminal as below.
pi@raspberrypi:~/GrovePi/Software/Python $ python grove_ultrasonic.py
9
9
9
9
9
9
9
9
9
9
9

FAQs

Q1: How does the Grove-Ultrasonic sensor work?

- A1: When we provide a pulse trigger signal with more than 10uS through singal pin, the Grove_Ultrasonic_Ranger will issue 8 cycles of 40kHz cycle level and detect the echo. The pulse width of the echo signal is proportional to the measured distance. Here is the formula: Distance = echo signal high time * Sound speed (340M/S)/2.

Q2: Why Grove-Ultrasonic sensor only has 1 signal pin, comparing with other ultrasonic sensor Trig and Echo pins?

- A2:Grove_Ultrasonic_Ranger’s trig and echo signal share 1 SIG pin through MCU.

Q3: Where can I find technical support if I have some other issue?

- A3: Please send an email to techsupport@seeed.cc

Resources

Tech Support

Please do not hesitate to contact techsupport@seeed.cc if you have any technical issue. Or submit the issue into our forum.