nodemcu code example

Example 1: nodemcu router code

#include <ESP8266WiFi.h>

const char* ssid = "******"; 
const char* password = "******";

IPAddress staticIP(192,168,1,22); 
IPAddress gateway(192,168,1,9); 
IPAddress subnet (255,255,255,0);

void setup(void) {
    Serial.begin(9600); 
    Serial.println();

    Serial.printf("Connecting to Xs \n", ssid); 
    WiFi.begin(ssid, password); 
    WiFi.config(staticIP, gateway, subnet);

    while (WiFi.status() != WL_CONNECTED) {
        delay(500); 
        Serial.print("."); 
    }

    Serial.println();
    Serial.print("Connected, IP address: "); 
    Serial.println(WiFi.localIP());
}
void loop() {}

Example 2: install nodemcu in arduino

Go to file -> preferances. 	
Add below link to additional board manager. 
LINK: http://arduino.esp8266.com/stable/package_esp8266com_index.json
Tools -> Boards Manager 
Search for ESP and install esp8266

Example 3: nodemcu with firebase

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>
#define FIREBASE_HOST "**********"           // Your Firebase Project URL 
#define FIREBASE_AUTH "************"         // Your Firebase Database Secret
#define WIFI_SSID "**************"           // your WiFi SSID
#define WIFI_PASSWORD "********"             // your WiFi PASSWORD
 
#define Relay1 12 //D6
int value1;
 
#define Relay2 14 //D2
int value2;
 
#define Relay3 4  //D1
int value3;
 
#define Relay4 5 //D5
int value4;
 
void setup() 
{
  Serial.begin(115200);               
  pinMode(Relay1,OUTPUT);
  pinMode(Relay2,OUTPUT);
  pinMode(Relay3,OUTPUT);
  pinMode(Relay4,OUTPUT);
 
  digitalWrite(Relay1,HIGH);
  digitalWrite(Relay2,HIGH);
  digitalWrite(Relay3,HIGH);
  digitalWrite(Relay4,HIGH);
 
  WiFi.begin(WIFI_SSID,WIFI_PASSWORD);
  Serial.print("connecting");
  while (WiFi.status()!=WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("connected:");
  Serial.println(WiFi.localIP());
 
  Firebase.begin(FIREBASE_HOST);
  Firebase.setInt("S1",0);        
  Firebase.setInt("S2",0); 
  Firebase.setInt("S3",0); 
  Firebase.setInt("S4",0); 
  
}
 
 
void firebasereconnect()
{
  Serial.println("Trying to reconnect");
    Firebase.begin(FIREBASE_HOST);
  }
 
void loop() 
{
  if (Firebase.failed())
      {
      Serial.print("setting number failed:");
      Serial.println(Firebase.error());
      firebasereconnect();
      return;
      }
      
  value1=Firebase.getString("S1").toInt();        //Reading the Status of Variable 1 from the firebase
  
  if(value1==1)                                             
     {
      digitalWrite(Relay1,LOW);
      Serial.println("Relay 1 ON");
    }
    else if(value1==0)                                    
    {                                      
      digitalWrite(Relay1,HIGH);
      Serial.println("Relay 1 OFF");
    }
 
  value2=Firebase.getString("S2").toInt();         //Reading the Status of Variable 2 from the firebase
  
  if(value2==1)                                                           
     {
      digitalWrite(Relay2,LOW);
      Serial.println("Relay 2 ON");
    }
    else if(value2==0)                                                   
    {                                      
      digitalWrite(Relay2,HIGH);
      Serial.println("Relay 2 OFF");
    }
 
   value3=Firebase.getString("S3").toInt();         //Reading the Status of Variable 3 from the firebase
  
  if(value3==1)                                                         
     {
      digitalWrite(Relay3,LOW);
      Serial.println("Relay 3 ON");
    }
    else if(value3==0)                                                    
    {                                      
      digitalWrite(Relay3,HIGH);
      Serial.println("Relay 3 OFF");
    }
 
   value4=Firebase.getString("S4").toInt();         //Reading the Status of Variable 4 from the firebase
  
  if(value4==1)                                                           
     {
      digitalWrite(Relay4,LOW);
      Serial.println("Relay 4 ON");
    }
    else if(value4==0)                                                    
    {                                      
      digitalWrite(Relay4,HIGH);
      Serial.println("Relay 4 OFF");
    }    
}