coa_test_code.txt

#include <LiquidCrystal.h>
#include <Keypad.h>

const int buzzer=6;
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const byte ROWS = 4;
const byte COLS = 3;
char Keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};
byte rowPins[ROWS] = { 14, 15, 16, 17 };
byte colPins[COLS] = { 8, 9, 10 };
Keypad customKeypad = Keypad(makeKeymap(Keys), rowPins, colPins, ROWS, COLS);


void setup() {
  pinMode(7,OUTPUT);
  pinMode(13,OUTPUT);
  pinMode(buzzer,OUTPUT);
  analogReference(INTERNAL);
  lcd.begin(32, 2);
  Serial.begin(9600);
}
float maxi = 0;
float mini = 1000;
float sum = 0;
int count = 0;
float temp;
float avg;

float avg_temp(float a, int c) {
  float ans;
  ans = a / c;
  return ans;
}
int detect_keys() {
  int number = 0;
  int i = 2;

  while (i--) {
    char customKey;
    customKey = customKeypad.waitForKey();
    if (customKey == '*') {
      break;
    }
    if (customKey == '1') {
      number = number * 10 + 1;
    }
    if (customKey == '2') {
      number = number * 10 + 2;
    }
    if (customKey == '3') {
      number = number * 10 + 3;
    }
    if (customKey == '4') {
      number = number * 10 + 4;
    }
    if (customKey == '5') {
      number = number * 10 + 5;
    }
    if (customKey == '6') {
      number = number * 10 + 6;
    }
    if (customKey == '7') {
      number = number * 10 + 7;
    }
    if (customKey == '8') {
      number = number * 10 + 8;
    }
    if (customKey == '9') {
      number = number * 10 + 9;
    }
    if (customKey == '0') {
      number = number * 10 + 0;
    }

    // lcd.setCursor(1, 1);
    // lcd.print(number);
    // lcd.clear();
  }
  return number;
}

void alarm_out(int a,int max,int min) {


  if (a <= min) {
    digitalWrite(13, HIGH);
    digitalWrite(7, LOW);
    // digitalWrite(11, LOW);
    // digitalWrite(buzzer,LOW);
    noTone(buzzer);
    //delay(1000);
  }
  if (a > min && a < max) {
    digitalWrite(13, LOW);
    digitalWrite(7, LOW);
    // digitalWrite(13, LOW);
    // digitalWrite(buzzer,LOW);
    noTone(buzzer);
    //delay(1000);
  }
  if (a >= max) {
    digitalWrite(13, LOW);
    digitalWrite(7, HIGH);
    tone(buzzer, 1000);
    // delay(1000);
  }
}

void loop() {


  // int flag = 1;
  lcd.setCursor(1, 0);
  lcd.print("* Welcome to our arduino project *");
  for (int counter = 0; counter < 25; counter++) {
    lcd.scrollDisplayLeft();
    delay(150);
  }
  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("Press - 1");
  lcd.setCursor(1, 1);
  lcd.print("for room temp");
  char customKey;
  customKey = customKeypad.waitForKey();
  lcd.clear();


  
  
  if (customKey == '1') {
    lcd.setCursor(1, 0);
    lcd.print("Select OPTION - ");
    lcd.setCursor(1, 1);
    lcd.print("1-ST 2-AVG 3-MAX MIN");

    customKey = customKeypad.waitForKey();
    lcd.clear();
    int t = 5,u=0,l=0;
    if (customKey == '1') {
      lcd.setCursor(1, 0);
      lcd.print("enter the time:");
      t = detect_keys();
      lcd.setCursor(1, 1);
      lcd.print(t);
      delay(1000);
      lcd.clear();

      lcd.setCursor(1, 0);
      lcd.print("enter upper limit:");
      u = detect_keys();
      lcd.setCursor(1, 1);
      lcd.print(u);
      delay(1000);
      lcd.clear();

      lcd.setCursor(1, 0);
      lcd.print("enter lower limit:");
      l = detect_keys();
      lcd.setCursor(1, 1);
      lcd.print(l);
      delay(1000);
      lcd.clear();



      while (t--) {
        temp = (float)100 * (1.1 / 1023) * analogRead(A4);
        lcd.setCursor(0, 1);
        lcd.print("Press 0 to exit.");
        lcd.setCursor(0, 0);
        lcd.print("Room tem : ");
        lcd.setCursor(9, 0);
        lcd.print(temp, 2);
        lcd.print(" C");
        Serial.print("Room temperature : ");
        Serial.print(temp, 2);
        Serial.println(" deg C");
        sum = sum + temp;
        alarm_out(temp,u,l);

        if (temp > maxi) {
          maxi = temp;
        }
        if (temp < mini) {
          mini = temp;
        }
        count++;

        delay(1000);
        lcd.clear();
      }
    }
    if (customKey == '2') {
      lcd.setCursor(0, 1);
      lcd.print("Press 0 to exit.");
      lcd.setCursor(0, 0);
      avg = avg_temp(sum, count);
      lcd.print("Avg temp : ");
      lcd.setCursor(9, 0);
      lcd.print(avg, 2);
      Serial.print("Avg temperature ");
      Serial.print(avg, 2);
      Serial.println(" deg C");
      while (customKey != '0') { customKey = customKeypad.waitForKey(); }
      lcd.clear();
    }
    if (customKey == '3') {
      lcd.setCursor(0, 1);
      lcd.print("Press 0 to exit.");
      lcd.setCursor(0, 0);
      lcd.print("MaX ");
      lcd.setCursor(4, 0);
      lcd.print(maxi, 2);
      lcd.print(" C");
      Serial.print("Max temp : ");
      Serial.print(maxi, 2);
      Serial.println(" C");

      lcd.setCursor(13, 0);
      lcd.print("Min ");
      lcd.setCursor(17, 0);
      lcd.print(mini, 2);
      lcd.print(" C");
      Serial.print("Mintemp");
      Serial.print(mini, 2);
      Serial.println(" C");

      while (customKey != '0') { customKey = customKeypad.waitForKey(); }
      lcd.clear();
    }
  }
}