esp32 how can I get result digital wind speed sensor

Other Hardware Sensors
1

how can I get wind speed from digital wind speed sensor
I try a lot of code but it doesn't work
example

float  windspeed;   
volatile unsigned long start, duration;
void setup()
{
  Serial.begin(9600);
  pinMode(27,INPUT);
  pinMode(5,OUTPUT);

  attachInterrupt( 0, wspeed,  RISING );
  start=millis();
}
void wspeed()
{
  duration = millis() - start;
  start    = millis();
}

void loop()
{
digitalWrite(5,digitalRead(27));
   
Serial.print ("windspeed : ");
  windspeed = ( 312.5/ (float) duration ); // .3125 mph per hz
  if (duration > 1000)
    {
    windspeed =0;
    }
Serial.print (windspeed);
Serial.println (" MPH");
}
2

peak_wichu:
I try a lot of code but it doesn't work

What does it do?

A common approach is to use interrupts as you did, but just increment a count. Periodically, calculate windspeed and zero out the count again.

3

No need to zero out the count, just remember the last value you read.

Also you may need a critical section to read the count if its an 8-bit microcontroller and
more than 8 bits of counter...

4

wildbill:
What does it do?

A common approach is to use interrupts as you did, but just increment a count. Periodically, calculate windspeed and zero out the count again.

I don't know how to pause loop for counting interrupt. Please show me how. Thank you

5

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