finaProjectTeamB.ino

// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// cam bien sieu am config
const unsigned int TRIG_PIN = 7;
const unsigned int ECHO_PIN = 6;
const unsigned int BAUD_RATE = 9600;

const int ledPin = 13;
const int buzzPin = 10;
const int tempSensor = A0;
const int buttonPullPin = 8;
// int statePullUp = 0;
// int statePullUpon = 0;
// int statePullUpoff = 1;

void setup()
{
    // set up the LCD's number of columns and rows:

    // ultrasonic sensor configures
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
    pinMode(ledPin, OUTPUT);
    Serial.begin(BAUD_RATE);
    pinMode(8, INPUT);
}

void loop()
{
    Serial.println("---------------------------------------"); // make a line
    // int statePullUp = digitalRead(buttonPullPin);
    // switch (statePullUp)
    // {
    // case 1:
    //     Serial.println("Da bam nut");
    //     statePullUpon++;
    //     delay(10);
    // case 0:
    //     Serial.println("Chua bam nut");
    //     statePullUpoff++;
    //     delay(10);
    // default:
    //     Serial.println("Kiem tra lai");
    // }

    Serial.print("State pull on: ");
    Serial.print(statePullUpon);
    Serial.print("\n");
    Serial.print("State pull off: ");
    Serial.print(statePullUpoff);
    Serial.print("\n");

    // cau hinh cam bien nhiet do
    int readTemp = analogRead(tempSensor);   // doc gia tri tu cam bien LM35
    float voltage = readTemp * 5.0 / 1024.0; // tinh gia tri hieu dien the tu gia tri cam bien
    float temp = voltage * 100.0;
    Serial.print("Nhiet do hien tai: ");
    Serial.print(temp);
    Serial.print("\n");
    lcd.begin(16, 2); // declare this is lcd 16x2
    lcd.print("Nhiet do: ");
    lcd.print(temp);
    lcd.print("  ");

    // untrlsonic configures
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    const unsigned long duration = pulseIn(ECHO_PIN, HIGH);
    int distance = duration / 29 / 2;

    if (duration == 0)
    {
        Serial.println("Warning: no pulse from sensor");
    }
    else
    {
        Serial.print("Khoang cach vat the gan nhat: ");
        Serial.print(distance);
        Serial.print(" cm\n");
        if (distance <= 90)
        {
            Serial.println("+ Canh bao co nguoi!");
            delay(50);
        }
        else
        {
            Serial.println("- Khong co nguoi!");
            delay(50);
        }
    }
    delay(100);

    // cau hinh buzzer
    if (distance <= 90)
    {
        tone(buzzPin, 1200, 1500);
        digitalWrite(ledPin, HIGH);
        delay(500);
    }
    else
    {
        tone(buzzPin, 1200, 300);
        digitalWrite(ledPin, LOW);
        delay(500); // delay 2s
    }

    // cau hinh hien thi LCD
    if (distance <= 90)
    {
        lcd.setCursor(0, 1);
        lcd.display(); //Hiển thị trở lại
        lcd.print("    Co nguoi!    ");
        delay(500);
    }
    else
    {
        lcd.display(); //Hiển thị trở lại
        lcd.setCursor(0, 1);
        lcd.print(" Khong co nguoi");
        delay(500);
    }
    // In ra dong chu
}