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Available Languages
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Introduction
The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats or dolphins do. It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package. From 2cm to 400 cm (or 1” to 13 feet). It operation is not affected by sunlight or black material like Sharp rangefinders are (although acoustically soft materials like cloth can be difficult to detect). It comes complete with ultrasonic transmitter and receiver module.
In this tutorial you will learn how to use this sensor with the Arduino uno and print the distance from an object to the serial monitor.
In this tutorial you will learn how to use this sensor with the Arduino uno and print the distance from an object to the serial monitor.
What you will need - Hardware
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For this tutorial you will need:
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The Circuit
The connections are pretty easy, see the image above with the breadboard circuit schematic.
The code
Here's the code,
- ultrasonic.Ranging(CM) will return distance from an object to centimeters
- ultrasonic.Ranging(INC) will return distance from an object to inches
- ultrasonic.Timing() will return the time (ms) where the signal took to return from the object
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | /* How to use the HC-SR04 Ultrasonic Sensor with Arduino Dev: Michalis Vasilakis // Date: 23/7/2015 // www.ardumotive.com */ //Libraries #include "Ultrasonic.h" //Define pins ultrasonic(trig,echo) Ultrasonic ultrasonic(A0,A1); //Variables int distance; void setup() { Serial.begin(9600); } void loop() { distance = ultrasonic.Ranging(CM); //Use 'CM' for centimeters or 'INC' for inches //Print distance... Serial.print("Object found at: "); Serial.print(distance); Serial.println("cm"); //every 1sec. delay(1000); } |
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Download the code from here and open it with Arduino IDE. Inside you will also find additional libraries.
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Open the serial monitor from tools menu of Arduino IDE
Well done!
You have successfully completed one more Arduino "How to" tutorial and you learned how to use the HC-SR04 Ultrasonic Sensor with Arduino uno. I hope you liked this, let me know in the comments.
