Cara membaca sensor waterflow menggunakan ESP32

#include <Arduino.h>


const int port_waterflow = 34;
volatile int pulse_waterflow = 0;
unsigned long oldTime_waterflow = 0;


void pulse_waterflower() {
pulse_waterflow++;
}
 
float baca_waterflow() {
unsigned long currentTime = millis();
if (currentTime - oldTime_waterflow > 1000) {
float flowRate = ((1000.0 / (currentTime - oldTime_waterflow)) * pulse_waterflow) / 5.5; // 5.5 is the number of pulses per liter
oldTime_waterflow = currentTime;
float waterflow = flowRate / 60.0;
pulse_waterflow = 0;
return waterflow;
}
return 0.0;
}


void setup()
{
Serial.begin(9600);
pinMode(port_waterflow, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(port_waterflow), pulse_waterflower, FALLING);

}
void loop(){
float waterflow = baca_waterflow();
Serial.println("Flow : " + (String)waterflow + " L/min"); 


}