Hello guys,im new to arduino and i'm dealing with a few problems.How i can measure at 500 Hz because it only show several reusult

Projects Programming
1 
#define TRIG_PIN 3
#define ECHO_PIN 4

void setup() {
  Serial.begin(115200); // Increased baud rate for faster serial communication
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  unsigned long startTime = micros();
  unsigned long currentTime;
  
  for (int i = 0; i < 2500; ++i) { // Perform 2500 measurements within 5 seconds for an approximate 500 Hz sampling rate
    currentTime = micros() - startTime;
    if (currentTime >= 5000000) // Break if 5 seconds have elapsed
      break;

    float voltage = measureVoltage();
    Serial.print("Time: ");
    Serial.print((float)currentTime / 1000000.0, 3); // Convert microseconds to seconds
    Serial.print("s, Voltage: ");
    Serial.print(voltage);
    Serial.println("V");
    
    while ((micros() - startTime) < (i + 1) * 2000) {} // Wait until next sampling instant
  }
  
  delay(1000); // Delay for 1 second before restarting
}

float measureVoltage() {
  // Send a short pulse to trigger the sensor
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  // Measure the duration of the echo pulse
  unsigned long pulseDuration = pulseIn(ECHO_PIN, HIGH);
  
  // Calculate voltage (replace with your scaling factor)
  float voltage = pulseDuration * 0.000343; // Speed of sound in air (m/s)
  return voltage;
}
2

Explain how this is to measure an external frequency. It appears you are using an ultrasonic distance sensor.

3

Yes im using HCSR-04 this setup is to test capabilities of the sensor to detect changes in flow.So the data must have high sampling frequency to record the changes.

4

Is this ChatGPT generated code, by any chance?

5

Hi, @daniel_mecha
Welcome to the forum.
Thanks for using code tags. :+1:

Are you trying to make an ultrasonic flow meter?

Tom... :smiley: :+1: :coffee: :australia:

8

I do the basic coding myself and when trying to put 500 Hz ifrequency it shows error.so i ask chatgpt to show me the solution

9

yes

10

Not possible with the HC-SR04. It has an on board microprocessor that cannot be modified. All you can do is replace that MCU with another, programmed to do what you want.

The circuit of the HC-SR04 board has been reverse engineered, and you can read about it here:
HC-SR04 | David Pilling

11

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