It is most likely your code trying to do to much to fast and causing the background operations to lose connectivity.
We are not developers or masters either. Most of us are just Blynk users and programming beginners.
I spend a lot of time Googling the ideas I read about here, and then experimenting with what I find to learn about it.
Google ESP8266 interrupts, spend some time reading and you will find it is not as complex as it first seems.
It might be, or not, this
const int btnPin4 = 1;
The ESP has some “special” pins that can cause unwanted behavior if not used correctly.
https://tttapa.github.io/ESP8266/Chap04%20-%20Microcontroller.html
https://www.forward.com.au/pfod/ESP8266/GPIOpins/index.html
Try starting with just one button and led, and then add them in one by one and see if there is a point when the connection issues start.
@PeteKnight @Gunner @lvennard
Thank you so mupc to all. for your guidance and help.
My problem was solved by just editing the code, by adding Blynk.run();
in void checkPhysicalButton() after every if statement.
Thank you once again to All @PeteKnight @Gunner @lvennard for giving your precious time to reply on my post and for helping me. now my project is working fine 
here is the code…
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "token";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "ssid";
char pass[] = "pass";
// Set your LED and physical button pins here
const int ledPin1 = 12;
const int ledPin2 = 13;
const int ledPin3 = 14;
const int ledPin4 = 15;
const int btnPin1 = 5;
const int btnPin2 = 4;
const int btnPin3 = 2;
const int btnPin4 = 0;
BlynkTimer timer;
void checkPhysicalButton();
int led1State = LOW;
int btn1State = HIGH;
int led2State = LOW;
int btn2State = HIGH;
int led3State = LOW;
int btn3State = HIGH;
int led4State = LOW;
int btn4State = HIGH;
// Every time we connect to the cloud...
BLYNK_CONNECTED() {
// Request the latest state from the server
Blynk.syncVirtual(V12);
Blynk.syncVirtual(V13);
Blynk.syncVirtual(V14);
Blynk.syncVirtual(V15);
// Alternatively, you could override server state using:
//Blynk.virtualWrite(V12, led1State);
//Blynk.virtualWrite(V13, led2State);
//Blynk.virtualWrite(V14, led3State);
//Blynk.virtualWrite(V15, led4State);
}
// When App button is pushed - switch the state
BLYNK_WRITE(V12) {
led1State = param.asInt();
digitalWrite(ledPin1, led1State);
}
BLYNK_WRITE(V13) {
led2State = param.asInt();
digitalWrite(ledPin2, led2State);
}
BLYNK_WRITE(V14) {
led3State = param.asInt();
digitalWrite(ledPin3, led3State);
}
BLYNK_WRITE(V15) {
led4State = param.asInt();
digitalWrite(ledPin4, led4State);
}
void checkPhysicalButton()
{
if (digitalRead(btnPin1) == LOW) {
// btn1State is used to avoid sequential toggles
if (btn1State != LOW) {
// Toggle LED state
led1State = !led1State;
digitalWrite(ledPin1, led1State);
// Update Button Widget
Blynk.virtualWrite(V12, led1State);
}
btn1State = LOW;
} else {
btn1State = HIGH;
}
if (digitalRead(btnPin2) == LOW) {
// btnState is used to avoid sequential toggles
if (btn2State != LOW) {
// Toggle LED state
led2State = !led2State;
digitalWrite(ledPin2, led2State);
// Update Button Widget
Blynk.virtualWrite(V13, led2State);
}
btn2State = LOW;
} else {
btn2State = HIGH;
}
Blynk.run();
if (digitalRead(btnPin3) == LOW) {
// btnState is used to avoid sequential toggles
if (btn3State != LOW) {
// Toggle LED state
led3State = !led3State;
digitalWrite(ledPin3, led3State);
// Update Button Widget
Blynk.virtualWrite(V14, led3State);
}
btn3State = LOW;
} else {
btn3State = HIGH;
}
Blynk.run();
if (digitalRead(btnPin4) == LOW) {
// btnState is used to avoid sequential toggles
if (btn4State != LOW) {
// Toggle LED state
led4State = !led4State;
digitalWrite(ledPin4, led4State);
// Update Button Widget
Blynk.virtualWrite(V15, led4State);
}
btn4State = LOW;
} else {
btn4State = HIGH;
}
Blynk.run();
}
void setup()
{
// Debug console
Serial.begin(9600);
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);
{ pinMode(ledPin1, OUTPUT);
pinMode(btnPin1, INPUT_PULLUP);
digitalWrite(ledPin1, led1State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin2, OUTPUT);
pinMode(btnPin2, INPUT_PULLUP);
digitalWrite(ledPin2, led2State);
timer.setInterval(100L, checkPhysicalButton);}
{
pinMode(ledPin3, OUTPUT);
pinMode(btnPin3, INPUT_PULLUP);
digitalWrite(ledPin3, led3State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin4, OUTPUT);
pinMode(btnPin4, INPUT_PULLUP);
digitalWrite(ledPin4, led4State);
// Setup a function to be called every 100 ms
timer.setInterval(100L, checkPhysicalButton);}
}
void loop()
{
Blynk.run();
timer.run();
}
I love it when I’m right!
Pete.
This setup seems a bit off to me. Why the need for all the extra brackets, and multiple timer calls to the same function.
void setup()
{
// Debug console
Serial.begin(9600);
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);
{ pinMode(ledPin1, OUTPUT);
pinMode(btnPin1, INPUT_PULLUP);
digitalWrite(ledPin1, led1State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin2, OUTPUT);
pinMode(btnPin2, INPUT_PULLUP);
digitalWrite(ledPin2, led2State);
timer.setInterval(100L, checkPhysicalButton);}
{
pinMode(ledPin3, OUTPUT);
pinMode(btnPin3, INPUT_PULLUP);
digitalWrite(ledPin3, led3State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin4, OUTPUT);
pinMode(btnPin4, INPUT_PULLUP);
digitalWrite(ledPin4, led4State);
// Setup a function to be called every 100 ms
timer.setInterval(100L, checkPhysicalButton);}
}
I also see you are not using GPIO 1 any more as well. So it seems you need a little more then just add Blynk.run(); to your sketch. To be honest, I do not see why this code would need the extra ```Blynk.run();`` commands in order to function correctly. I could see maybe increasing the timer interval a little, but that may not even be necessary.
I want to add DHT11 sensor into this project.
To monitor room temperature and humidity
Can anybody help me please how can I modify this code.
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "token";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "ssid";
char pass[] = "pass";
// Set your LED and physical button pins here
const int ledPin1 = 12;
const int ledPin2 = 13;
const int ledPin3 = 14;
const int ledPin4 = 15;
const int btnPin1 = 5;
const int btnPin2 = 4;
const int btnPin3 = 2;
const int btnPin4 = 0;
BlynkTimer timer;
void checkPhysicalButton();
int led1State = LOW;
int btn1State = HIGH;
int led2State = LOW;
int btn2State = HIGH;
int led3State = LOW;
int btn3State = HIGH;
int led4State = LOW;
int btn4State = HIGH;
// Every time we connect to the cloud...
BLYNK_CONNECTED() {
// Request the latest state from the server
Blynk.syncVirtual(V12);
Blynk.syncVirtual(V13);
Blynk.syncVirtual(V14);
Blynk.syncVirtual(V15);
// Alternatively, you could override server state using:
//Blynk.virtualWrite(V12, led1State);
//Blynk.virtualWrite(V13, led2State);
//Blynk.virtualWrite(V14, led3State);
//Blynk.virtualWrite(V15, led4State);
}
// When App button is pushed - switch the state
BLYNK_WRITE(V12) {
led1State = param.asInt();
digitalWrite(ledPin1, led1State);
}
BLYNK_WRITE(V13) {
led2State = param.asInt();
digitalWrite(ledPin2, led2State);
}
BLYNK_WRITE(V14) {
led3State = param.asInt();
digitalWrite(ledPin3, led3State);
}
BLYNK_WRITE(V15) {
led4State = param.asInt();
digitalWrite(ledPin4, led4State);
}
void checkPhysicalButton()
{
if (digitalRead(btnPin1) == LOW) {
// btn1State is used to avoid sequential toggles
if (btn1State != LOW) {
// Toggle LED state
led1State = !led1State;
digitalWrite(ledPin1, led1State);
// Update Button Widget
Blynk.virtualWrite(V12, led1State);
}
btn1State = LOW;
} else {
btn1State = HIGH;
}
if (digitalRead(btnPin2) == LOW) {
// btnState is used to avoid sequential toggles
if (btn2State != LOW) {
// Toggle LED state
led2State = !led2State;
digitalWrite(ledPin2, led2State);
// Update Button Widget
Blynk.virtualWrite(V13, led2State);
}
btn2State = LOW;
} else {
btn2State = HIGH;
}
Blynk.run();
if (digitalRead(btnPin3) == LOW) {
// btnState is used to avoid sequential toggles
if (btn3State != LOW) {
// Toggle LED state
led3State = !led3State;
digitalWrite(ledPin3, led3State);
// Update Button Widget
Blynk.virtualWrite(V14, led3State);
}
btn3State = LOW;
} else {
btn3State = HIGH;
}
Blynk.run();
if (digitalRead(btnPin4) == LOW) {
// btnState is used to avoid sequential toggles
if (btn4State != LOW) {
// Toggle LED state
led4State = !led4State;
digitalWrite(ledPin4, led4State);
// Update Button Widget
Blynk.virtualWrite(V15, led4State);
}
btn4State = LOW;
} else {
btn4State = HIGH;
}
Blynk.run();
}
void setup()
{
// Debug console
Serial.begin(9600);
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);
{ pinMode(ledPin1, OUTPUT);
pinMode(btnPin1, INPUT_PULLUP);
digitalWrite(ledPin1, led1State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin2, OUTPUT);
pinMode(btnPin2, INPUT_PULLUP);
digitalWrite(ledPin2, led2State);
timer.setInterval(100L, checkPhysicalButton);}
{
pinMode(ledPin3, OUTPUT);
pinMode(btnPin3, INPUT_PULLUP);
digitalWrite(ledPin3, led3State);
timer.setInterval(100L, checkPhysicalButton);}
{ pinMode(ledPin4, OUTPUT);
pinMode(btnPin4, INPUT_PULLUP);
digitalWrite(ledPin4, led4State);
// Setup a function to be called every 100 ms
timer.setInterval(100L, checkPhysicalButton);}
}
void loop()
{
Blynk.run();
timer.run();
}
I’d use the search to be honest. It’s been covered on here countless times.
