IoT Temperature and Humidity Monitor using Blynk app

This project focuses on monitoring things over the internet using sensors connected to Arduino with Wi-Fi connection through ESP8266

Sep 10, 2021

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Components and supplies

ESP8266 ESP-01

Arduino UNO

Jumper wires (generic)

DHT11 Temperature & Humidity Sensor (3 pins)

Tools and machines

Soldering iron (generic)

Apps and platforms

Arduino IDE

Blynk

Project description

Code

Arduino Code

arduino

1#define BLYNK_AUTH_TOKEN            "Your_Authorization_Token" 
2#define   BLYNK_PRINT Serial
3#include <ESP8266_Lib.h>
4#include <BlynkSimpleShieldEsp8266.h>
5#include   "dht.h"
6#define dht_apin A0
7
8char auth[] = BLYNK_AUTH_TOKEN;
9char   ssid[] = "your_SSID";
10char pass[] = "your_password";
11dht DHT;
12int T,   H;
13
14#define EspSerial Serial1
15#define ESP8266_BAUD 115200
16
17ESP8266   wifi(&EspSerial);
18
19BlynkTimer timer;
20
21void myTimerEvent()
22{
23  DHT.read11(dht_apin);
24   T = DHT.temperature;
25  H = DHT.humidity;
26  Blynk.virtualWrite(V0, T);
27   Blynk.virtualWrite(V1, H);
28}
29
30void setup()
31{
32  Serial.begin(115200);
33   EspSerial.begin(ESP8266_BAUD);
34  delay(10);
35  Blynk.begin(auth, wifi, ssid,pass);   //Comment this if you're using Local Server
36  //If you have your Local Blynk   Server then uncomment this statement --> Blynk.begin(auth, wifi, ssid, pass, "Your_Machine's_IP_Address",   8080);   //Use your server's port if this doesn't work
37
38  timer.setInterval(100L,   myTimerEvent);
39}
40
41void loop()
42{
43  Blynk.run();
44  timer.run();   
45}

#define BLYNK_AUTH_TOKEN            "Your_Authorization_Token" 
#define   BLYNK_PRINT Serial
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
#include   "dht.h"
#define dht_apin A0

char auth[] = BLYNK_AUTH_TOKEN;
char   ssid[] = "your_SSID";
char pass[] = "your_password";
dht DHT;
int T,   H;

#define EspSerial Serial1
#define ESP8266_BAUD 115200

ESP8266   wifi(&EspSerial);

BlynkTimer timer;

void myTimerEvent()
{
  DHT.read11(dht_apin);
   T = DHT.temperature;
  H = DHT.humidity;
  Blynk.virtualWrite(V0, T);
   Blynk.virtualWrite(V1, H);
}

void setup()
{
  Serial.begin(115200);
   EspSerial.begin(ESP8266_BAUD);
  delay(10);
  Blynk.begin(auth, wifi, ssid,pass);   //Comment this if you're using Local Server
  //If you have your Local Blynk   Server then uncomment this statement --> Blynk.begin(auth, wifi, ssid, pass, "Your_Machine's_IP_Address",   8080);   //Use your server's port if this doesn't work

  timer.setInterval(100L,   myTimerEvent);
}

void loop()
{
  Blynk.run();
  timer.run();   
}

Arduino Code

arduino

1#define BLYNK_AUTH_TOKEN            "Your_Authorization_Token" 
2#define  BLYNK_PRINT Serial
3#include <ESP8266_Lib.h>
4#include <BlynkSimpleShieldEsp8266.h>
5#include  "dht.h"
6#define dht_apin A0
7
8char auth[] = BLYNK_AUTH_TOKEN;
9char  ssid[] = "your_SSID";
10char pass[] = "your_password";
11dht DHT;
12int T,  H;
13
14#define EspSerial Serial1
15#define ESP8266_BAUD 115200
16
17ESP8266  wifi(&EspSerial);
18
19BlynkTimer timer;
20
21void myTimerEvent()
22{
23  DHT.read11(dht_apin);
24  T = DHT.temperature;
25  H = DHT.humidity;
26  Blynk.virtualWrite(V0, T);
27  Blynk.virtualWrite(V1, H);
28}
29
30void setup()
31{
32  Serial.begin(115200);
33  EspSerial.begin(ESP8266_BAUD);
34  delay(10);
35  Blynk.begin(auth, wifi, ssid,pass);  //Comment this if you're using Local Server
36  //If you have your Local Blynk  Server then uncomment this statement --> Blynk.begin(auth, wifi, ssid, pass, "Your_Machine's_IP_Address",  8080);   //Use your server's port if this doesn't work
37
38  timer.setInterval(100L,  myTimerEvent);
39}
40
41void loop()
42{
43  Blynk.run();
44  timer.run();  
45}

#define BLYNK_AUTH_TOKEN            "Your_Authorization_Token" 
#define  BLYNK_PRINT Serial
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
#include  "dht.h"
#define dht_apin A0

char auth[] = BLYNK_AUTH_TOKEN;
char  ssid[] = "your_SSID";
char pass[] = "your_password";
dht DHT;
int T,  H;

#define EspSerial Serial1
#define ESP8266_BAUD 115200

ESP8266  wifi(&EspSerial);

BlynkTimer timer;

void myTimerEvent()
{
  DHT.read11(dht_apin);
  T = DHT.temperature;
  H = DHT.humidity;
  Blynk.virtualWrite(V0, T);
  Blynk.virtualWrite(V1, H);
}

void setup()
{
  Serial.begin(115200);
  EspSerial.begin(ESP8266_BAUD);
  delay(10);
  Blynk.begin(auth, wifi, ssid,pass);  //Comment this if you're using Local Server
  //If you have your Local Blynk  Server then uncomment this statement --> Blynk.begin(auth, wifi, ssid, pass, "Your_Machine's_IP_Address",  8080);   //Use your server's port if this doesn't work

  timer.setInterval(100L,  myTimerEvent);
}

void loop()
{
  Blynk.run();
  timer.run();  
}

Downloadable files

Connection Diagram Fritzing File

Connection Diagram

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