MX PRACTICAL- WATER FLOW MEASUREMENT

MECHATRONICS PRACTICAL:
Measurement of Water Flow using water flow sensor with Arduino Uno and
seeing output in 16X2 LCD

CODE:

#include <LiquidCrystal.h>                                         //lcd header
const int watermeterPin = 2;                                       //op from sensor is obtained at pin 2
volatile int  pulse_frequency;                                     // for counting number of pulses
unsigned int  litreperminute;                                     //stores the result in litres/min
unsigned long currentTime, loopTime;                               //used for setting delay
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 6;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);                         //LCD pin declaration
void setup()
{
   pinMode(watermeterPin, INPUT);                                 //setting digital pin 2 as input
   Serial.begin(9600);                                             //set bitrate as 9600 bps
   attachInterrupt(0, getFlow, FALLING);                          //accept interrupt from pin 2, getFlow
//is ISR, triggered when the pin goes
//from high to low
   currentTime = millis();                                         //start measuring time
   loopTime = currentTime;
 
   lcd.begin(16, 2);                                               //declare type of lcd
}
void loop ()   
{
    delay(1000);
         litreperminute = (pulse_frequency / 7.5);                   //calculations in L/min
      pulse_frequency = 0;                                         //reset pulsefreq for new readings
      lcd.setCursor(0,0);                                         //set cursor to first line
      lcd.print("Water Flow Meter");
      lcd.setCursor(0,1);                                         //set cursor to second line
      lcd.print("FlowRate:");
      lcd.print(litreperminute, DEC);                             //display value in decimal on LCD
      lcd.print("L/min ");
      Serial.print("FlowRate:");
      Serial.print(litreperminute, DEC);                           //display value in decimal on SM
      Serial.println(" Liter/min ");
  }

void getFlow ()                                                   //ISR
{
  pulse_frequency++;                                              //increment count
 }