Ultrasonic Sensor HC-SR04 and Arduino Tutorial

Please note, circuit diagram at 0:56 should be: 5v to VCC, GND to GND, D10 to Trig, D9 to Echo.

In this Arduino Tutorial you will learn how to use the HC-SR04 Ultrasonic sensor. It can measure distance from 2 cm to 4 meters with a ranging accuracy up to 3mm. The working principle of this module is quite simple.

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[HowToMechatronics]

Please note, circuit diagram at 0:56 should be: 5v to VCC, GND to GND, D10 to Trig, D9 to Echo.

[connortierney]

This video is incredible, code is so much easier to understand with the calculations. What a guy!!

[aumpauskar]

The code
```
const int trigPin = 9;
const int echoPin = 10;

long duration;
int distance;

void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}

void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = duration*0.034/2;

Serial.print("Distance: ");
Serial.print(distance);
Serial.print("\n");
}
```

[lovemadeinjapan]

The code works, but is not the best to combine with other stuff. It is really advisable to connect the TRIG to pin 3 and let an interrupt do the measuring in the background, so you don't have puseIn halting your code completely while sensing.

[kingshahzad]

No Words for the appreciation dear. Hats Off. Keep making these type of tutorials.

[gongye]

Maybe just one thing to add up, the moment you set trig pin to HIGH, echo pin will be switched to HIGH as well, until it detects the back wave. That's why the period of echo pin input on HIGH mode equals to the time ultrasonic wave travels.

[quaxiscorporationforresear]

You have echo and vcc in series. The red wire should be I the right most pin of your diagram.

[Blind_Beetle]

The code works fine, however the circuitry you have provided in the video is connected wrong.Other than that thank you for the explanation, greatly appreciated!

[symbianwater]

Yes follow the instructions on the site, not here. There you can copy and paste the code too.

[mnusne]

Where's the diagram if u connect a lcd

[ndoWare]

Cool project!. Besides arduino, I have also tried to use 2 esp8266, you can get sensors and displays without cables

[Blinkation]

you can fit the sensor on the arduino without a breadboard: just use pin 11 as vcc

[miguelmontalban]

I broke my ultrasonic sensor cause of your diagram 🙃

[meddiys]

Great job SIR, for those who ask about LCD connection please see the code (2.3.4.5.6.7 on arduino pins = 4.6.11.12.13.14 on LCD) thanks.

[omarqattosh]

very helpful
thank you my bro
keep it real
love from india and battir

[Frolov]

Мужик, красавчик, мудро поступил и делаешь контент на английском. Респект!

[northshorepx]

Wonderful. Thank you so much. Very easy to follow and the maths was explained very simply.

[saurabhsinghjat]

i m little confused you sent a 10 microseconds long pulse, doesn't matter where it goes it will be 10 sec long and " pulsein" is calculating the time from high(when the pulse enters) to low (when pulse ends) and it is 10 micro seconds.
but it is calculating the time from transmitting the pulse to receiving the pulse

[BeckyMarshallDesign]

Thank you! I'll be referencing this in my next video. Please be aware that your fritzing diagram is incorrect.

[IamMrWu]

Thanks for sharing the code, but I was hopping to learn the physical setup of the US sensor as well