Here is i make arduino (NodeMCU) online data logger temperature & humidity with Blynk.
fisrt material list u need :
1. Arduino , u can choose another type, but in this project i use NodeMCU
2. DHT 11
3. Blynk APP
4. Android Phone for runing Blynk
here's the step by step to set up your blynk
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| open Blynk App, Login and klik your New Project |
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| Selct your board type |
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select your connection type
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Klik OK and you will receive auth key in your email, take this to arduino code for this project
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| After that , add some many icon, 2 valu label and one history graph |
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klik on widget icon, and change this option
Humidity use Virtual pin V5
Temperature use Virtual pin V6 |
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Here the setting like this.
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Here's the complete App
After your create the Blynk APP , now your code your NodeMCU
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <DHT.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "c7116c30d9b14576be2fc5b24d6b500f";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Nextbit";
char pass[] = "987654321";
#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
DHT dht(DHTPIN, DHTTYPE);
SimpleTimer 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!");
return;
}
// 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()
{
Serial.begin(9600); // See the connection status in Serial Monitor
Blynk.begin(auth, ssid, pass);
dht.begin();
// Setup a function to be called every second
timer.setInterval(1000L, sendSensor);
}
void loop()
{
Blynk.run(); // Initiates Blynk
timer.run(); // Initiates SimpleTimer
}
Upload the code to your NodeMCU and run
And you will se onlien temeprature and humidity
Trouble shooot.
- Connect your DHT11 to pin D2 in nodemCU
-If you still found error compiling in arduino code, please instal many library that you need
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