#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
const int ROW_NUM = 4;
const int COLUMN_NUM = 4;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address = 0x27, LCD = 16x2
char keys[ROW_NUM][COLUMN_NUM] = {
{ '1', '2', '3', 'A' },
{ '4', '5', '6', 'B' },
{ '7', '8', '9', 'C' },
{ '*', '0', '#', 'D' }
};
byte pin_rows[ROW_NUM] = { 8, 9, 10, 11 };
byte pin_column[COLUMN_NUM] = { 4, 5, 6, 7 };
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);
int sensorInterrupt = 0;
int sensorPin = 2;
int solenoidValve = 5;
unsigned int SetPoint = 400;
String code = "";
float calibrationFactor = 90;
volatile byte pulseCount = 0;
float flowRate = 0.0;
unsigned int flowMilliLitres = 0;
unsigned long totalMilliLitres = 0, volume = 0;
unsigned long oldTime;
const int relais_moteur = 3;
void setup() {
totalMilliLitres = 0;
pinMode(relais_moteur, OUTPUT);
lcd.init(); // Initialize I2C LCD
lcd.backlight(); // Turn on backlight
lcd.setCursor(0, 0);
lcd.print("Set Volume:");
Serial.begin(9600);
pinMode(solenoidValve, OUTPUT);
digitalWrite(solenoidValve, HIGH);
pinMode(sensorPin, INPUT);
digitalWrite(sensorPin, HIGH);
attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
void loop() {
char key = keypad.getKey();
if (key) {
code += key;
lcd.setCursor(0, 1);
lcd.print(code);
delay(100);
}
if (key == 'D') {
if (code.toInt() <= 1500) {
volume = code.toInt();
} else {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Set Volume:");
}
code = "";
}
if (totalMilliLitres < volume) {
digitalWrite(relais_moteur, HIGH);
if ((millis() - oldTime) > 1000) {
detachInterrupt(sensorInterrupt);
flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
oldTime = millis();
flowMilliLitres = (flowRate / 60) * 1000;
totalMilliLitres += flowMilliLitres;
Serial.print("Flow rate :-");
Serial.print(flowMilliLitres, DEC);
Serial.print("mL/Second\t");
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Speed:");
lcd.print(flowMilliLitres);
lcd.print(" ml/s");
Serial.print("Output Liquid Quantity: ");
Serial.print(totalMilliLitres, DEC);
Serial.println("mL");
lcd.setCursor(0, 1);
lcd.print("Filled:");
lcd.print(totalMilliLitres);
lcd.print(" ml");
if (totalMilliLitres > 40) {
SetSolinoidValve();
}
pulseCount = 0;
attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}
} else {
digitalWrite(relais_moteur, LOW);
volume = 0;
}
}
void pulseCounter() {
pulseCount++;
}
void SetSolinoidValve() {
digitalWrite(solenoidValve, LOW);
}