read_flow_sensor

volatile unsigned long cacah;
float liter;
const byte interruptPin = 2;
unsigned long cur_time, old_time;
const unsigned long interval = 500; // ambil data per 0.5 detik
const unsigned calibration = 250;
String txt_tampil;

void setup() {
  // put your setup code here, to run once:
    Serial.begin(9600);
    attachInterrupt(digitalPinToInterrupt(interruptPin), flow, CHANGE);
}

void loop() {
  // put your main code here, to run repeatedly:
    cur_time = millis();
    if ( cur_time - old_time >= interval ){
      liter = (float)cacah/calibration;
      txt_tampil = String("Cacah: ") + cacah + " Volume: " + liter + " mL";
      Serial.println(txt_tampil);
      old_time = cur_time;
    }
}

void flow(){
  cacah++;
}