Introduction
List of component that I'm used in this project
and for apps I'm used in this project
Diagram and Wiring
How to make this Project
Result Photo
Video Demonstration of Control LED and Monitoring Temperature & Humidity

Published December 2, 2023 © GPL3+

Control LED and Monitor Temperature & Humidity Using Blynk

This is a project where you can Controlling LED and Monitoring Temperature & Humidity with your Mobile

BeginnerFull instructions provided3 hours452

Control LED and Monitor Temperature & Humidity Using Blynk

Things used in this project

Hardware components

Espressif ESP32

LED (generic)

DHT11 Temperature & Humidity Sensor (3 pins)

Breadboard (generic)

Male/Female Jumper Wires

Software apps and online services

Arduino IDE

Blynk

Story

Introduction

I created this project because in my country the climate (weather) has changed very drastically. when it rains the weather will be so cold that it makes me flu, but on a sunny day the weather will be so hot that it makes me sweat.

This is a simple project which if developed further might become a smart room or smart home project that can prevent us from getting sick due to drastic climate change.

I'm using a DHT11 to monitor temperature & humidity in my workspace, and I added LED control to this project with an ESP32 as an intermediary connection to Blynk

List of component that I'm used in this project:

· ESP32

· Sensor DHT11

· LED (Light Emitting Diode)

· Bread Board- Male/Female jumper wires

and for apps I'm used in this project:

· Arduino IDE

· Blynk

already set in the Hardware components and Software apps part

Diagram and Wiring

This is the image of diagram block control LED and Monitor Temperature & Humidity.

and next image is Wiring of control LED and Monitor Temperature & Humidity

LED

· Pin Anode to Pin 4 in ESP32 (Yellow Cable)

· Pin Cathode to Pin GND in ESP32 (Black Cable)

DHT 11

· Pin Signal to Pin 5 in ESP32 (Green Cable)

· Pin VCC to Pin 5V in ESP32 (Red Cable)

· Pin GND to Pin GND in ESP32 (Black Cable)

How to make this Project:

1. Making account in Blynk and setting for the controller, open web Blynk in your browser (https://blynk.cloud) and make account in Blynk, after make account in Blynk next is Create new template.

Picture 1.1 Create New Template

Create Name of your project and choose ESP32 in column Hardware, you can empty for the Description and click "Done". And Then go to Datastreams and click New Datastream choose Virtual PIN.

Picture 1.2 Create Virtual Pin

And the Screen will be like this, click “Done” if you finish set the Virtual Pin. We need create 3 Virtual Pins:

· V0 for Temperature (Suhu)

· V1 for Humidity (Kelembaban)

· V2 for LED (Lampu)

Picture 1.3 Screen in Datastreams

After you already finish in Datastreams, go to Web Dashboard for make button switch to control LED and 2 gauges for monitor Temperature and Humidity.

Picture 1.4 Screen in Web Dashboard

You can get Switch button and gauge in widget box, Don’t forget to set the gauge and Switch button, there’s icon gear in the box gauge and Switch button for setting the Virtual Pin.

Picture 1.5 Setting the Virtual pin in gauge

After this step you can go to Devices for get the AUTH TOKEN

Picture 1.6 Create New Device

Then you click “+New Device” and Choose Template after that choose your template for Control LED and Monitoring Temperature & Humidity and click “Create”.

Picture 1.7

And you will get notification of auth token in the Top right corner of your Screen for connected to Blynk.

2. Create a circuit of LED and monitor the temperature and humidity on the Breadboard,

If you are confused by this photo, I have provided a schematic diagram along with an explanation and the cables used in the schematic part.

3. Programming in Arduino IDE and Upload the program to ESP32

Open your Arduino IDE application then program the code for controlling LED and monitoring the temperature and humidity, To use the DHT11 sensor, add the ‘DHT Sensor Library’ and ‘Adafruit Unified Sensor’ libraries via Sketch → Include Library → Manage Library.

Picture 3.1 Install library DHT

Create a program as follows, fill in the "ssid" with your WiFi name, then "pass" with your WiFi password, and auth with the token obtained from Blynk.

Picture 3.2 Set the Auth token you obtained in Blynk and set your ssid & pass

Then upload the program to ESP32 and waiting untill “Done Uploading”.

Picture 3.3 Done Uploading the program to ESP32

If it has been uploaded, open the Serial Monitor in Arduino IDE and there’s already information about Temperature & Humidity.

Picture 3.4 Information Temperature &Humidity in Serial Monitor

In the same time, on Blynk your Device will change from offline to online.

Picture 3.5 Blynk Device Online

After this step, you can controlling LED and Monitoring Temperature & Humidity by using Blynk website.

4. Controlling LED and Monitoring Temperature & Humidity on your Mobile

Download Blynk application in your Mobile, if you already have it, open the Blynk application then login with the account you previously created, after that press developer mode which is shaped like a pliers and open the template you created earlier then add the gauge component to display temperature & humidity and switch button to turn on/off the LED.

Picture 4.1 Dashboard in apk Blynk

Then setting the virtual pins in gauge and switch button

Gauge 1 is for Temperature (Set to V0 for monitor Temperature)Gauge 2 is for Humidity (Set to V1 for monitor Humidity)Switch button for LED (Set to V2 for control LED)

Picture 4.2 Gauge settings in apk Blynk

after this return to the main menu, and the gauge will display temperature & humidity information and Switch button will controlling LED.

And you can controlling LED and Monitoring Temperature & Humidity on your Mobile.

Result Photo

Control LED and Monitoring Temperature & Humidity in Blynk Website

Control LED and Monitoring Temperature & Humidity in Blynk application on mobile

Circuit of control LED and monitoring temperature and humidity on the Breadboard

Temperature & Humidity Information in Serial monitor on Arduino IDE

Video Demonstration of Control LED and Monitoring Temperature & Humidity

This is the Demonstration Video for the project Control LED and Monitoring Temperature & Humidity (Language Indonesia)

Demonstration Video

Code

Code of Control LED and Monitor Temperature & Humidity

#define BLYNK_TEMPLATE_ID "TMPL6MNKgjWaA"
#define BLYNK_TEMPLATE_NAME "ESP32 DHT11"
#define BLYNK_AUTH_TOKEN "7VJCKzTYt63Al2tBZDie_JlQg9Jik9Wq"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>


#include <DHT.h>

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "    "; // Name of WiFi or hotspot
char pass[] = "    "; // Password of Wifi or hotspot 

#define DHTPIN 5          // Mention the digital pin where you connected 
#define DHTTYPE DHT11     // DHT 11  
DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

BLYNK_WRITE(V2)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  if (pinValue == 1)
  {
    digitalWrite(4, HIGH);
  }
  else {
    digitalWrite(4, LOW);
  }
  // process received value
}


void setup(){
   Serial.begin(115200);
   pinMode(4, OUTPUT);
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
  
  dht.begin();
  timer.setInterval(2500L, sendSensor);
}

void loop(){
  Blynk.run();
  timer.run();
}
void sendSensor(){
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Blynk.virtualWrite(V1, h);
  Blynk.virtualWrite(V0, t);
  Serial.print("Temperature : ");
  Serial.print(t);
  Serial.print("    Humidity : ");
  Serial.println(h);


  if(t > 30){
   // Blynk.email("abdulakbaralaziz090703@gmail.com", "Alert", "Temperature over 28C!");
    Blynk.logEvent("temp_alert","Temp above 30 degrees");
  }
}

Credits

M. Abdul Akbar Al Aziz

1 project • 1 follower

Contact

Thanks to RIfqi Naufal Iman.

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Control LED and Monitor Temperature & Humidity Using Blynk