Arduino: Blynk Traffic Light Sketch (NodeMCU + 3 leds)

01_blynk_traffic_light.ino

#define BLYNK_TEMPLATE_ID           "blynk_template_id"
#define BLYNK_DEVICE_NAME           "Quickstart Device"
#define BLYNK_AUTH_TOKEN            "blynk_auth_token"


// Comment this out to disable prints and save space
#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = BLYNK_AUTH_TOKEN;

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "wifi_name";
char pass[] = "wifi_pass";


BLYNK_WRITE(V1) // Executes when the value of virtual pin 1 changes
{
  if(param.asInt() == 1)
  {
    digitalWrite(D3,HIGH);  // Set pin D3 HIGH
    Serial.println("Red Led On");
  }
  else
  {
    digitalWrite(D3,LOW);  /// Set pin D3 LOW
    Serial.println("Red Led off");
  }
}

BLYNK_WRITE(V2)
{
  if(param.asInt() == 1)
  {
    digitalWrite(D2,HIGH);
    Serial.println("Yellow Led On");
  }
  else
  {
    digitalWrite(D2,LOW);
    Serial.println("Yellow Led off");
  }
}

BLYNK_WRITE(V3)
{
  if(param.asInt() == 1)
  {
    digitalWrite(D1,HIGH);
    Serial.println("Green Led On");
  }
  else
  {
    digitalWrite(D1,LOW); 
    Serial.println("Green Led off");
  }
}


void setup()
{
  // Debug console
  Serial.begin(9600);

  Blynk.begin(auth, ssid, pass);

  pinMode(D3, OUTPUT); // Initialise digital pin D3 as an output pin.  ---> Red Led
  pinMode(D2, OUTPUT); // Initialise digital pin D2 as an output pin.  ---> Yellow Led
  pinMode(D1, OUTPUT); // Initialise digital pin D1 as an output pin.  ---> Green Led

}

void loop()
{
  Blynk.run();
}