How to Use ESP32 with HCSR04 Ultrasonic Sonar sensor and Arduino IDE

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Code and Circuit Diagram-
github.com/harshkzz/ESP32-HCS...
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[@nurhijran8287]

thanks man it works

[@treditor1337]

its working fine sir, thanks a lot

[@viniciusdemenezescosta9958]

thanks

[@knowledge_seeker80]

By the way, after a research can get data from ultrasonic module just by using 2 wires by carry data over dc lines :)

[@gonzaflex]

can you share the link to read about?

[@utmocanimations4136]

I ran mine with a similar code, but it keeps sending me the Distance:0

[@bostonmacosx]

This board iS 5V..... not great.

[@UpskillwithAI]

how do i open the link to see the code and circuit

[@INOVATRIX]

All given in description.

[@nurfatinsyazwinasaharbi5687]

why my distance just 0cm

[@hajokijewski6415]

Had the same issue - Ensure that you do not use pin 2 for something other e.g. build in LED. Move to 5/18 instead 2/4

[@sisas2008]

amigo solo tienes que cambiar en el algoritmo #define echoPin 18 por #define echoPin 2 y #define trigPin 5 por #define trigPin 4 . ya que fisicamente en el esp32 estan en 2 y 4

[@renzodamian724]

IF YOU HAVE 0CM USE 5V instead of 3,3V!!!!!!!!!!!!!

[@by_jhona]

O meu sensor ultrasonico hc sr04 nao está funcionando no 3.3v, sabe o que poderia resolver?

[@INOVATRIX]

Connect power to VIN pin on the ESP32 Board.

[@by_jhona]

@@INOVATRIX to receive the echo return, would there be damage to the esp32 input pin?

[@hithushmohanaraja1133]

Will the same code work for esp8266?

[@INOVATRIX]

Yes it should work, just make sure that you select the right pins.

[@hithushmohanaraja1133]

@@INOVATRIX tysm!

[@hithushmohanaraja1133]

The distance is always 0 cm. I am using a 3 3v esp8266. What is the issue?

[@gonzaflex]

distances under 40 cm can be measure without problem, more that that i just get random values. Any idea how solve it?

[@INOVATRIX]

That is the approximate limit of the sensor. For more range you'll need to use more expensive and accurate sensor

[@gonzaflex]

i am using one HCSR04 with one Arduino Mega 2560 and can measure easily 2 mts in a water tank, but with ESP32 works bad, any idea?@@INOVATRIX

[@NotHumant8727]

bad. It is not async and uses blocking functions. slow

[@edwinawariyah6239]

Use this code instead and connect the VCC to VIN (Notice I changed the pins and the serial monitor baud)
#include
#define echoPin 18 // CHANGE PIN NUMBER HERE IF YOU WANT TO USE A DIFFERENT PIN
#define trigPin 5 // CHANGE PIN NUMBER HERE IF YOU WANT TO USE A DIFFERENT PIN
long duration, distance;
void setup(){
Serial.begin (115200);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop(){
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distance = duration / 58.2;
String disp = String(distance);
Serial.print("Distance: ");
Serial.print(disp);
Serial.println(" cm");
delay(1000);
}

[@explorinOW]

Thank you so much. It works! But can you tell me the reason why you have thought to make this change & why was that one not working?