Wifi doesn't show up while connecting device

Me.sowmya · February 24, 2022, 2:52pm

I am a beginner to blynk and iot. I wanted to spend my leave days useful. Please someone help me with the problem I’m facing.
I did the basic project using esp8266 and a relay.

Actually I uploaded the code to esp8266 and set up the connection.
The device is somehow connected to the blynk app , which I don’t really know how it connected.
I didn’t connect the device through -->new project → wifi
It showed online to my device right after i uploaded the code
But i can’t control the switch using blynk app.
Please help.
Thankyou
Sowmya.

PeteKnight · February 24, 2022, 3:01pm

Blynk Legacy or Blynk IoT?

Exactly what device and what code are you using, and how is your relay connected?

Pete.

Me.sowmya · February 24, 2022, 3:46pm

I’m using Blynk IoT sir Uploading: 1645717405401905584607263388884.jpg…
And I’ve connected the relay as shown above.

PeteKnight · February 24, 2022, 4:00pm

Your image upload hasn’t worked, and you’ve not provided the code you are using.

When you do post the code, copy and paste it from your IDE and put triple backticks at the beginning and end of the code.
Triple backticks look like this:
```

Pete.

Me.sowmya · February 24, 2022, 4:26pm

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h> // include BlynkSimpleEsp8266 in this folder "Docunment > Arduino > Library"
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "a7a91cda22f144de92748ba0c9a4674a"; // replace yout auth token here.
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Parth"; //Wifi SSID Name
char pass[] = "12345678";  //Wifi Password
void setup()
{
  // Debug console
  Serial.begin(9600);
  pinMode(D1,OUTPUT);
  pinMode(D2,OUTPUT);
  pinMode(D3,OUTPUT);
  pinMode(D4,OUTPUT);
  digitalWrite(D1,HIGH);
  digitalWrite(D2,HIGH);
  digitalWrite(D3,HIGH);
  digitalWrite(D4,HIGH);
  
  
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);
}
void loop()
{
  Blynk.run();
}```

Me.sowmya · February 24, 2022, 4:28pm

Me.sowmya · February 24, 2022, 4:30pm

The made the required changes ( ssid , password and auth )in the code and uploaded sir
It connected to the blynk app sir
It shows online and offline status

John93 · February 24, 2022, 4:51pm

Add BLYNK_TEMPLATE_ID and BLYNK_DEVICE_NAME on top of your sketch, before anything.

also, you are connecting the relay + to the nodemcu Vin pin, you should connect it to the 3.3v pin or use external power source.

John93 · February 24, 2022, 5:16pm

This is a good example

How to control a pin using blynk app and physical button.

Madhukesh · February 25, 2022, 3:12am

The relay being used is a 5v relay. So Vin should work fine for now as the USB line and Vin are same.

Connecting it to a 3v3 pin will not turn the relay on.

Me.sowmya · February 25, 2022, 5:34am

Actually sir , i added all those lines too
I changed the connections and tried that too
But i can’t control the device using blynk

Me.sowmya · February 25, 2022, 5:37am

So what should I do now to make it work sir?

Madhukesh · February 25, 2022, 6:54am

Did you go through this link that @John93 provided ? What have you got so far ? What does your serial monitor show ?

PeteKnight · February 25, 2022, 8:21am

Post your updated code, and the output from your serial monitor when you reset the device.
Use triple backticks for both. BTW, the triple backticks need to be on an empty line of their own before and after the first and last lines of code or serial output.

Pete.

Me.sowmya · February 25, 2022, 5:30pm

#define BLYNK_TEMPLATE_ID "TMPL5nMj0-9i"
#define BLYNK_DEVICE_NAME "HOME AUTOMATION1"
#define BLYNK_AUTH_TOKEN "HhUchmI4bmQRx6acE6TBTLtpoiSElSIa"
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h> // include BlynkSimpleEsp8266 in this folder "Docunment > Arduino > Library"
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "HhUchmI4bmQRx6acE6TBTLtpoiSElSIa";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "***********"; //Wifi SSID Name
char pass[] = "**********";  //Wifi Password
void setup()
{
  // Debug console
  Serial.begin(9600);
  pinMode(D1,OUTPUT);
  pinMode(D2,OUTPUT);
  pinMode(D3,OUTPUT);
  pinMode(D4,OUTPUT);
  digitalWrite(D1,HIGH);
  digitalWrite(D2,HIGH);
  digitalWrite(D3,HIGH);
  digitalWrite(D4,HIGH);
 
 
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);
}
void loop()
{
  Blynk.run();
}

I’ve provided the wifi credentials in the code on the IDE

PeteKnight · February 25, 2022, 5:54pm

So you don’t want to share your serial monitor output then?

Pete.

Me.sowmya · February 25, 2022, 6:02pm

I’m so sorry , i had a power cut here.

PeteKnight · February 25, 2022, 6:12pm

When you post serial monitor output you scouts copy and paste the text, and use triple backticks as I asked you to.

What widgets have you set-up in the app or the web console?

What datastreams have you set up?

What data streams have you assigned to your widgets?

What do you have connected to pins D2, D4 and D4 of your NodeMCU?

Pete.

Me.sowmya · February 25, 2022, 6:27pm

A single button widget
Switch data stream - virtual integer type
Only D1 pin in node MCU is connected to the relay sir

Me.sowmya · February 25, 2022, 6:33pm

H$⸮[58] Connecting to Sowmya-Railtel
[562] Connected to WiFi
[562] IP: 192.168.1.2
[562] 
    ___            
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/ v1.0.1 on NodeMCU

[634] Connecting to blynk.cloud:80
[738] Ready (ping: 25ms).