Temp & Humidity DHT11, Weather monitoring in Mobile App

Monitoring temperature and humidity in our home using DHT11 via bluetooth hc-05

Feb 1, 2020

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weather

monitoring

Components and supplies

Jumper wires (generic)

Mobile Phone

DHT11 Temperature & Humidity Sensor (3 pins)

Arduino UNO

HC-05 Bluetooth Module

Tools and machines

Multitool, Screwdriver

Apps and platforms

Android Studio

Arduino IDE

Project description

Code

DHT11

arduino

Arduino program that send value of DHT11 via bluetooth to Mobile application

1#include <dht.h>
2#include <LiquidCrystal_I2C.h>
3#include <Wire.h>   
4dht DHT;
5
6LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to   0x27 for a 16 chars and 2 line display
7
8#define DHT11_PIN 7
9
10void setup()   {
11  // put your setup code here, to run once:
12
13  Serial.begin(9600);
14   lcd.init();                      // initialize the lcd 
15  lcd.backlight();
16   lcd.begin(16,2);
17
18}
19
20void loop() {
21  // put your main code here,   to run repeatedly:
22
23  int chk = DHT.read11(DHT11_PIN);
24  lcd.setCursor(0,0);   
25  lcd.print("Temp    :");
26  lcd.print(DHT.temperature);
27  lcd.print((char)223);
28   lcd.print("C");
29  lcd.setCursor(0,1);
30  lcd.print("Humidity:");
31   lcd.print(DHT.humidity);
32  lcd.print("%");
33
34  Serial.print(DHT.temperature);
35   Serial.print("+");
36  Serial.print(DHT.humidity);
37  Serial.println();
38   
39  delay(1000);
40  
41
42}
43

#include <dht.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>   
dht DHT;

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to   0x27 for a 16 chars and 2 line display

#define DHT11_PIN 7

void setup()   {
  // put your setup code here, to run once:

  Serial.begin(9600);
   lcd.init();                      // initialize the lcd 
  lcd.backlight();
   lcd.begin(16,2);

}

void loop() {
  // put your main code here,   to run repeatedly:

  int chk = DHT.read11(DHT11_PIN);
  lcd.setCursor(0,0);   
  lcd.print("Temp    :");
  lcd.print(DHT.temperature);
  lcd.print((char)223);
   lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Humidity:");
   lcd.print(DHT.humidity);
  lcd.print("%");

  Serial.print(DHT.temperature);
   Serial.print("+");
  Serial.print(DHT.humidity);
  Serial.println();
   
  delay(1000);
  

}

DHT11

arduino

Arduino program that send value of DHT11 via bluetooth to Mobile application

1#include <dht.h>
2#include <LiquidCrystal_I2C.h>
3#include <Wire.h>  
4dht DHT;
5
6LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to  0x27 for a 16 chars and 2 line display
7
8#define DHT11_PIN 7
9
10void setup()  {
11  // put your setup code here, to run once:
12
13  Serial.begin(9600);
14  lcd.init();                      // initialize the lcd 
15  lcd.backlight();
16  lcd.begin(16,2);
17
18}
19
20void loop() {
21  // put your main code here,  to run repeatedly:
22
23  int chk = DHT.read11(DHT11_PIN);
24  lcd.setCursor(0,0);  
25  lcd.print("Temp    :");
26  lcd.print(DHT.temperature);
27  lcd.print((char)223);
28  lcd.print("C");
29  lcd.setCursor(0,1);
30  lcd.print("Humidity:");
31  lcd.print(DHT.humidity);
32  lcd.print("%");
33
34  Serial.print(DHT.temperature);
35  Serial.print("+");
36  Serial.print(DHT.humidity);
37  Serial.println();
38  
39  delay(1000);
40  
41
42}
43

#include <dht.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>  
dht DHT;

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to  0x27 for a 16 chars and 2 line display

#define DHT11_PIN 7

void setup()  {
  // put your setup code here, to run once:

  Serial.begin(9600);
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.begin(16,2);

}

void loop() {
  // put your main code here,  to run repeatedly:

  int chk = DHT.read11(DHT11_PIN);
  lcd.setCursor(0,0);  
  lcd.print("Temp    :");
  lcd.print(DHT.temperature);
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Humidity:");
  lcd.print(DHT.humidity);
  lcd.print("%");

  Serial.print(DHT.temperature);
  Serial.print("+");
  Serial.print(DHT.humidity);
  Serial.println();
  
  delay(1000);
  

}

Downloadable files

Schematic Components

Pin may not same with actual program, sorry. i dont have schematic software.

Schematic Components

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tehcwan_canel

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