WATER FLOW METER

This project uses a YF-S201 flow sensor, an I2C LCD display, and an Arduino to see which uses more water: a bucket or a shower. The flow sensor measures how much water is flowing, and the Arduino calculates the total amount. The I2C LCD display shows the results in real-time. Students can easily switch between measuring water for a bucket or a shower. This helps understand and compare water usage, promoting better water-saving habits.

Components Required

1. Arduino Board (Arduino Uno) – 1
2. YF-S201 Flow Sensor – 1
3. I2C LCD Display (16×2) – 1
4. Breadboard – 1
5. Connecting Wires-1012(M-M and M-F)

Connections

1. YF-S201 Flow Sensor
   • Red Wire (VCC): Connect to Arduino 5V
   • Black Wire (GND): Connect to Arduino GND
   • Yellow Wire (Signal): Connect to Arduino digital pin D2
2. I2C LCD Display
   • GND: Connect to Arduino GND
   • VCC: Connect to Arduino 5V
   • SDA: Connect to Arduino A4
   • SCL: Connect to Arduino A5

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Initialize the I2C LCD with I2C address 0x27 and 16x2 display
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int flowSensorPin = 2;
const int buttonPin = 3;

volatile int pulseCount = 0;
unsigned long oldTime = 0;

float flowRate = 0.0;
float totalLitersBucket = 0.0;
float totalLitersShower = 0.0;
bool measureBucket = true; // true for bucket, false for shower

void setup() {
  pinMode(flowSensorPin, INPUT_PULLUP);
  pinMode(buttonPin, INPUT_PULLUP); // Enable internal pull-up resistor

  lcd.init();
  lcd.backlight();
  lcd.print("Measuring Bucket");

  attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, FALLING);

  Serial.begin(9600);
}

void loop() {
  // Check if the button is pressed
  if (digitalRead(buttonPin) == LOW) {
    delay(200); // Debounce delay
    if (measureBucket) {
      measureBucket = false;
      lcd.clear();
      lcd.print("Measuring Shower");
    } else {
      measureBucket = true;
      lcd.clear();
      lcd.print("Measuring Bucket");
    }
    delay(200); // Debounce delay
  }

  if ((millis() - oldTime) > 1000) { // Only process counters once per second
    detachInterrupt(digitalPinToInterrupt(flowSensorPin));
    flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / 7.5; // In Liters per minute
    oldTime = millis();
    pulseCount = 0;

    if (measureBucket) {
      totalLitersBucket += flowRate / 60.0; // Convert to liters per second
      lcd.setCursor(0, 1);
      lcd.print("Bucket: ");
      lcd.print(totalLitersBucket);
      lcd.print(" L    ");
    } else {
      totalLitersShower += flowRate / 60.0; // Convert to liters per second
      lcd.setCursor(0, 1);
      lcd.print("Shower: ");
      lcd.print(totalLitersShower);
      lcd.print(" L    ");
    }

    Serial.print("Flow rate: ");
    Serial.print(flowRate);
    Serial.print(" L/min ");
    Serial.print("Total liters bucket: ");
    Serial.print(totalLitersBucket);
    Serial.print(" L ");
    Serial.print("Total liters shower: ");
    Serial.print(totalLitersShower);
    Serial.println(" L");

    attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, FALLING);
  }
}

void pulseCounter() {
  pulseCount++;
}