How to make Bluetooth Temperature and Humidity Monitoring System using DHT11 Sensor

Click here and download App

 

CODE 

#include <SoftwareSerial.h>

SoftwareSerial bt(8, 9); // RX, TX

#include <LiquidCrystal.h>

#include <DHT.h>

#define dataPin A5

#define DHTTYPE DHT11

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); 

DHT dht(dataPin, DHTTYPE);

int temp;

int hum;

void setup() {

  Serial.begin(9600); 

  bt.begin(9600); 

  Serial.println("Ready");

  dht.begin();

  

  lcd.begin(16,2);  

  lcd.setCursor(0,0);

  lcd.print(" WELCOME To  My ");

  lcd.setCursor(0,1);

  lcd.print("YouTube  Channel");

  delay(2000);

  lcd.clear(); 

}

void loop(){

  hum = dht.readHumidity();

  temp = dht.readTemperature();

  

  lcd.setCursor(0,0);

  lcd.print("Humidity: ");

  lcd.print(hum);

  lcd.print("% ");

  lcd.setCursor(0,1); 

  lcd.print("Temp: "); 

  lcd.print(temp); 

  lcd.print((char)223); //degree symbol

  lcd.print("C ");

  bt.print(temp); //send temp to MIT App

  bt.print(";");

  bt.print(hum); //send hum to MIT App 

  bt.println(";");

  delay(1000);

}