Question

Blynk. How do reflect the status (on/off) of my LED on my ESP8266 to the widget in Blynk App?

Answer 1

After sign up click on ‘New Project’ to start your project.

Now provide your project a name and as blynk app works with diffferent hardware models. Thus opt for your device from choices.

Here, we are using ESP8266 node MCU.

So I am proceeding with node MCU.

While selecting your board opt for your association sort whether or not it's Wi-Fi or LAN or USB association.

After these steps click on ‘Create’ button to form your project.

As, the blank project opens, add Widgets to it by clicking on Add button (Plus sign button)

Now after this click on ‘Button’ to add a button in your project.

Now in button settings provide a name to your button. After this assign the pin number to the ‘OUTPUT’. Also, give names to your On/Off labels.

Things to note:-

Include all the required libraries for ESP8266 and Blynk App in the code, as shown below:

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

Enter the Auth Token in the code, which you can get from the Blynk App or from the mail you have received from Blynk.

char auth[ ] = "YourAuthToken";

To connect with WIFI enter your SSID name and password

char ssid[ ] = "YourNetworkName";
char pass[ ] = "YourPassword";

Here, void blinkLedWidget() function is used for switching ON and OFF the LED.

void blinkLedWidget() 
{
  if (led1.getValue()) {
    led1.off();
    Serial.println("LED on V1: off");
  } else {
    led1.on();
    Serial.println("LED on V1: on");
  }
}

In void setup( ) function, we will initialize the baud rate, LED output and will connect the module with the Wi-Fi using Blynk.begin(auth,ssid,password); function. This function begins the Wi-Fi connection.

void setup()
{
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(1000L, blinkLedWidget);
}

Now, copy and paste the complete code into Arduino IDE. Then upload the code into the ESP8266.

Then, open the Blynk App for controlling the LED from the button widget.

So we have successfully designed the Blynk App dashboard and controlled the LED through Blynk app using ESP8266.

CODE:

Now in programming, first we need to include the libraries
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[ ] = "YourAuthToken"

char ssid[ ] = "YourNetworkName";
char pass[ ] = "YourPassword";

WidgetLED led1(V1);
BlynkTimer timer;
void blinkLedWidget()
{
if (led1.getValue()) {
led1.off();
Serial.println("LED on V1: off");
} else {
led1.on();
Serial.println("LED on V1: on");
}
}

void setup()
{
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
timer.setInterval(1000L, blinkLedWidget);
}
void loop()
{
Blynk.run();
timer.run();
}