Temperature & Humidity monitoring with Blynk Cloud-ESP32

This tutorial shows how to monitor temperature and humidity from Magicbit (ESP32) and view it in the Blynk cloud dashboard.

BeginnerProtip1 hour11,211
Temperature & Humidity monitoring with Blynk Cloud-ESP32

Things used in this project

Hardware components

Magicbit (ESP32)
USB-A to Micro-USB Cable
Magicbit DHT11 Sensor Module

Software apps and online services

Arduino IDE
Arduino IDE


Read more


Arduino Code for the Project

  Download latest Blynk library here:

  Blynk is a platform with iOS and Android apps to control
  Arduino, Raspberry Pi and the likes over the Internet.
  You can easily build graphic interfaces for all your
  projects by simply dragging and dropping widgets.

    Downloads, docs, tutorials:
    Sketch generator: 
    Blynk community:  
    Follow us:        

  Blynk library is licensed under MIT license
  This example code is in public domain.


  This example shows how value can be pushed from Arduino to
  the Blynk App.

  For this example you'll need Adafruit DHT sensor libraries:

  App project setup:
    Value Display widget attached to V5
    Value Display widget attached to V6

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "**************"      //Paste your credentials here
#define BLYNK_DEVICE_NAME "*****************************"  //Paste your credentials here

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

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "*************************5m8a";//Paste auth token you copied

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "******************";///Enter your wifi name
char pass[] = "******************";// Enter wifi password

#define DHTPIN 32         // What digital pin we're connected to select yours accordingly

// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301

BlynkTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
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!");
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, h); // select your virtual pins accordingly
  Blynk.virtualWrite(V6, t); // select your virtual pins accordingly

void setup()
  // Debug console
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "", 80);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);


  // Setup a function to be called every second
  timer.setInterval(1000L, sendSensor);

void loop()




57 projects • 30 followers
Magicbit is an integrated development platform based on ESP32 for learning, prototyping, coding, electronics, robotics, IoT and more.


Add projectSign up / Login