I am getting errors in temperature and humidity meter?

Hello to everyone i using nodemcu and dht22 I am getting errors

  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:  
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  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

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DHT.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "9a9b936cac33471ca52e57becd8a22b8";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "TARIK";
char pass[] = "12345678";

#define DHTPIN D2          // What digital pin we're connected to

// 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);
  Blynk.virtualWrite(V6, t);

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()

Please edit your post and properly format the posted code…

Blynk - FTFC

Then provide more details… what errors?

I assume that your widget is “labeled value” ,so your widget is not well formatted

you may have
for V5 : /pin.##/ %
for V6 : /pin.##/ °C

add a Serial.print(h) to see the value in your serial monitor.

and use 3 backticks as @GunnerTechTools said, to format your code, please edit.


1 Like

I see serial monitor de temp and humanity only not see mobile phone

provide us screenshot of your “labeled value" widget as I did.

that seems correct !
please let us see your serial monitor

NEM = humidity Sicaklik = temp

all seems to be correct, so I don’t understand why blynk labeled value can’t display that.

please @GunnerTechTools, @marvin7
help required ! :wink:

Why you are not using this format?

he can, but it isn’t the reason why :wink:

I trying GAuGE and again not working? Temp and humi. Now online nodemcu and not work

your screenshot shows your nodemecu offline !

yes thiss SS offline i know … when I do not see the time I’m online again

And most probably I do :slight_smile: Search this forum for “float ESP8266” and this will lead you to old ESP8266 Arduino core issue. Update it.

ah ah, thanks @marvin7

may be the solution for @tariktumanbay !!
I never got such issue with my nodemcu V3,
probably @tariktumanbay uses an old ESP8266 :wink:

@tariktumanbay could you try to convert float value to string and see what happened ?

Yeap. Probably …(2.3.0?)

1 Like

im use nodemcu v3