Void Setup()

This section of the code is executed once at startup. This is were you can initialize code or just run a task once when the device first powers on.

For this application we will define the pin mode of each I/O, set the default relay state, and connect to the Blynk cloud.

void setup()
{
    for(int i=0; i<4; i++){ 
    // for loop for setting each I/O pin mode as an output
        pinMode(relayPins[i], OUTPUT);
        digitalWrite(relayPins[i], LOW);
    }
    delay(5000);
    Blynk.begin(auth); // connect to blynk cloud using auth token
}