Overview
Things
Story

Overview
Instructions

Published October 5, 2021 © GPL3+

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

IntermediateFull instructions provided7,478

Things used in this project

Hardware components

Arduino UNO

Any Arduino Board will work as Blynk app supports them all

Espressif ESP8266 ESP-01

DHT11 Temperature & Humidity Sensor (3 pins)

Jumper wires (generic)

Software apps and online services

Arduino IDE

Blynk

Hand tools and fabrication machines

Soldering iron (generic)

Story

Overview

In this project, with the help of Blynk IoT solutions, we will be able to monitor conditions over the Internet. This project works for both Private Networks and Public Networks.

The Project Cover is actually a Time Lapse of Temperature Drop after I turn on my Air Conditioner for about 30 mins on full power.

Instructions

If you want to make your own Blynk Local Server to enjoy Unlimited Energy and Low Latency then refer to this tutorial : https://create.arduino.cc/projecthub/devansh_tangri/how-to-make-your-own-blynk-server-2dca48?ref=user&ref_id=1856055&offset=0

Step 1 :

Use the code given below to program your Arduino which is going to compute data from the Temperature Sensor (DHT11).

We need to Flash the ESP8266 with AT Commands which makes ESP8266 as a Interface medium between General Arduino and the Blynk app over your Network.

Download the ESP8266 Flasher from : https://drive.google.com/file/d/0B3dUKfqzZnlwVGc1YnFyUjgxelE/view?resourcekey=0-6ZM6kHn9wpw-G-sqiA1PlA

Download your specific AT Commands bin file : https://github.com/Edragon/esp_firmware/tree/master/Firmware/AT-other/AI-THINKER/At_firmware_bin1.54

Step 2 :

Open ESP Flasher

Click the 'bin' button and locate the AT Commands bin file, use the COM port on which ESP8266 is connected or to which your FTDI breakout board is connected.

Step 3 :

Create a new Blynk Project and find your Authentication Token from the app or from the Server Properties Page if you own a Blynk Local Server.

In the Users Tab, select the username displayed and scroll down to find the Token

Use this token for the BLYNK_AUTH_TOKEN variable on line 1 in the code

Ex :
#define BLYNK_AUTH_TOKEN            "FQG2MTljldI0vsuoNKZi-zASlYBCfvny"

Step 4 :

We can use SuperChart widget in the Blynk App where you can plot the data over a vast period of time.

1 / 8 • Tap plus sign to add new Widgets

Code

Arduino Code

#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(); 
}

Credits

devansh_tangri

2 projects • 9 followers

I'm a 17 yo student, making Arduino Projects and Electrical Circuits is my favorite hobby. I have been making circuits for about 8 years.

IoT Temperature and Humidity Monitor using Blynk app