Ultrasonic Module HC-SR04 Distance Sensor For Arduino

by SainSmart

Product Features

• Using IO trigger for at least 10us high level signal
• The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back
• IF the signal back, through high level ,time of high output IO duration is the time from sending ultrasonic to returning. Test distance = (high level timeˇÁvelocity of sound (340M/S) /2
• Power supply :5V DC, quiescent current : <2mA,effectualangle: <15ˇăranging distance : 2cm~500 cm?resolution : 0.3 cm

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Product Description

NOTE:The link is the documents about Ultrasonic Module HC-SR04 Distance Sensor.

https://s3-ap-northeast-1.amazonaws.com/sain-amzn/20/20-019-100/HC-SR04.rar

There are 4 pins out of the module : VCC , Trig, Echo, GND . So it's a very easy interface for controller to use it ranging. The all process is : pull the Trig pin to high level for more than 10us impulse , the module start ranging ; finish ranging , If you find an object in front , Echo pin will be high level , and based on the different distance,it will take the different duration of high level. So we can calculated the distance easily :

Distance = ((Duration of high level)*(Sonic :340m/s))/2

Most Helpful Customer Reviews

33 of 33 people found the following review helpful

4.0 out of 5 stars I like it! November 15, 2011

By Ratiocrat

Amazon Verified Purchase

Educational: 4.0 out of 5 stars    Fun: 4.0 out of 5 stars   

This was very easy to set up and use with an Arduino Uno board. (Make the following connections from the HC-SR04 to the Arduino, respectively: VCC to 5V; GND to GND; Trig to any digital output; Echo to any digital input.) It was somewhat unstable using the Arduino 5V when running off USB power (it would fluctuate and even dip to a 0 cm reading for no reason), but this was fixed by using a 9v/650mA adapter, instead. I have only had it for a few hours, so I can't vouch for its reliability, but for 13 bucks, it's looking great so far!

18 of 18 people found the following review helpful

5.0 out of 5 stars A bit unintuitive at first, but a a very powerful (non)toy thereafter September 14, 2012

By Alexander

Amazon Verified Purchase

Durability: 5.0 out of 5 stars    Educational: 5.0 out of 5 stars    Fun: 5.0 out of 5 stars   

In my physics class, there came an experiment that required measuring the speed of a cheap toy car, with post its, rulers, a timer, and the close coordination of three people.

Needless to say, it wasn't working out.

Unsatisfied with our utter lack of experimental rigor, I bought this sensor.

The library written by cnobile ([...]) is the most important step in getting this running. To an electronics newbie, or a * moderately* experienced coder (myself), banging out the protocol would be a HUGE pain.

If arduino throws an error along the lines of "wiring.h does not exist", look for \HCSR04Ultrasonic\Ultrasonic.h in the library folder, open it in a good text editor, and change wiring.h to "Arduino.h". The Arduino IDE changed a few things since this library was released, and this worked for me.

Lastly, if you want to ditch the breadboard (assuming arduino UNO R3), plug Trig into 12 and Echo into 13. Conveniently this puts GND at the digital ground. To power the module, we can call 'pinMode(11, OUTPUT);' followed by 'digitalWrite(11, HIGH);' in our setup method, which will configure pin 11 to act as a low current source!

If you want to see my source code, throw me an email: [e-mail]

22 of 23 people found the following review helpful

5.0 out of 5 stars Not a toy, but a good module September 21, 2011

By Mike

Amazon Verified Purchase

Durability: 3.0 out of 5 stars    Educational: 5.0 out of 5 stars    Fun: 5.0 out of 5 stars   

This module should be relisted as something other than a toy (it has to be rated as a toy in the review process). Regardless of that, I bought this module instead of the Ping sensor, mostly because this one was less expensive and cost was an issue for this project. It easily integrated with an Arduino and I quickly coded it up to convert the output to distance. It works quite well so far.

12 of 13 people found the following review helpful

5.0 out of 5 stars Simple and accurate October 17, 2011

By Fabio Santos Franco

Amazon Verified Purchase

Durability: 5.0 out of 5 stars    Educational: 5.0 out of 5 stars    Fun: 5.0 out of 5 stars   

This is a great product that had simplicity in mind when it was developed. Once you get around the initial overhead of setting it up (a learning overhead), its usage is plain and simple.

The distance measurement is fairly accurate to the millimeters. I couldn't in fact determine if the difference in millimeters was my ruler measurement or if it was actual error of the device.

Like many ultrasonic devices, you can't measure the first few centimeters and I think that's expected.
All in all, I recommend this product for any projects. I used it with a netduino board with no hassle.

10 of 11 people found the following review helpful

5.0 out of 5 stars Very cool and easy to use January 28, 2013

By iltl32

Amazon Verified Purchase

Does exactly as promised. Very accurate. I had to slightly modify the Ping sketch that came with Ardiuno software, so here it is. Look at the constants for the correct pin placement.

/* Ping))) Sensor

This sketch reads a PING))) ultrasonic rangefinder and returns the
distance to the closest object in range. To do this, it sends a pulse
to the sensor to initiate a reading, then listens for a pulse
to return. The length of the returning pulse is proportional to
the distance of the object from the sensor.

The circuit:
* +V connection of the PING))) attached to +5V
* GND connection of the PING))) attached to ground

[...]

created 3 Nov 2008
by David A. Mellis
modified 30 Aug 2011
by Tom Igoe

This example code is in the public domain.

*/

// Pin number constants
const int triggerPin = 5;
const int echoPin = 6;

void setup() {
// initialize serial communication:
Serial.begin(9600);
}

void loop()
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, feet, inches, cm;

// The PING))) is triggered by a HIGH pulse of 2 or more microseconds....
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(triggerPin, OUTPUT);
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
digitalWrite(triggerPin, HIGH);
delayMicroseconds(5);
digitalWrite(triggerPin, LOW);

// The echo pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);

// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
feet = microsecondsToFeet(duration);

Serial.print(feet);
Serial.print("feet, ");
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();

delay(100);
}

long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See:[...]
}

long microsecondsToFeet(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we multiply by 12 to convert to feet and then by 2 to get the distance of the obstacle.
// See: [...]
}

long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
} Read more ›

3 of 3 people found the following review helpful

5.0 out of 5 stars Great range measurement device for the price December 21, 2012

By Arduino geek

Amazon Verified Purchase

Just got this in the mail and started to use it. You can use the Ping))) example in the ardunio libraries, but you need to modify it a bit. The GND and VCC pins are just Ground and 5V. The original arduino example assumes a sensor with only 3 pins so for this sensor you have to name and assign a dedicated input pin and output pin. From the sensor use the Trig pin as output from the arduino board and the Echo as a input. Other than that the code should be enough to get you going.

The capabilities of the sensor are what I expected. It seems to need to be directly facing the object and flat surfaces work best. I set it on a table with a meter stick and it was surprisingly accurate at the 1 meter mark as well as being able to distinguish every centimeter interval.

Good Luck!