Here is the Code which i Uploaded to the Nodemcu. Got it from a post in Blynk Community just changed the Auth & wifi Credentials.
#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[] = "xxxxxxxxxx";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "xxxx";
char pass[] = "xxxxxxx";
// 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 = 9;
const int btnPin4 = 1;
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;
}
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;
}
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;
}
}
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);
pinMode(ledPin2, OUTPUT);
pinMode(btnPin2, INPUT_PULLUP);
digitalWrite(ledPin2, led2State);
pinMode(ledPin3, OUTPUT);
pinMode(btnPin3, INPUT_PULLUP);
digitalWrite(ledPin3, led3State);
pinMode(ledPin4, OUTPUT);
pinMode(btnPin4, INPUT_PULLUP);
digitalWrite(ledPin4, led4State);
// Setup a function to be called every 100 ms
timer.setInterval(500L, checkPhysicalButton);
}
void loop()
{
Blynk.run();
timer.run();
}
After this connected the Relays to D5 / GPIO14, D6 / GPIO12, D7 / 13, D8 / 15.
then connected the Physical push buttons to the following pins - D1 / GPIO5 , D2 / GPIO4 , SD1 / GPIO10, SD2 / GPIO9 using a 10kohm resistor connected to ground and gave the other pin of button to 3.3v ( both taken form nodemcu itself).
the Physical Pin connection of buttons is something like the image attached, but doing the same with 4 buttons
