LCDdisplayMQTT-ESP8266.ino

const char* ssid = "SSID NAME";
const char* password = "WIFI PASSWORD";
const char* mqtt_server = "MQTT SERVER";
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <stdio.h>

#include <string>

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE  (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;
String living_room_humidity = "None";
String outside_temperature = "None";
String living_room_temperature = "None";
String greeting1 = "Line 1";
String greeting2 = "Line 2";
String balcony_temp = "None";
String pressure = "None";
unsigned long last_cycle;
unsigned long this_cycle;
bool first_loop = true;
bool first_livingTemp = true;
bool first_greeting = true;
bool first_livingHum = true;
bool first_balconyTemp = true;
bool first_pressure = true;
bool first_outsideTemp = true;

void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

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

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);

  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  String topic_str = String(topic);
  String delimiter = ";";
  String delimiter2 = "#";
  String payload_str = String((char*)payload);
  Serial.print(payload_str);
  if (topic_str == "living_room_dht") {



    String temp = payload_str.substring(0, payload_str.indexOf(delimiter));
    String hum = payload_str.substring(payload_str.indexOf(delimiter) + 1, payload_str.indexOf(delimiter) + 6);
    living_room_temperature = temp;
    living_room_humidity = hum;
    Serial.println(living_room_temperature);
    Serial.println(living_room_temperature);
  }
  else if (topic_str == "dallasOutdoor") {
    outside_temperature = payload_str.substring(0, 5);
    Serial.println(outside_temperature);

  }
  else if (topic_str == "greeting") {
    greeting1 = "";
    greeting2 = "";
    greeting1 = payload_str.substring(0, payload_str.indexOf(delimiter));
    greeting2 = payload_str.substring(payload_str.indexOf(delimiter)+1, payload_str.indexOf(delimiter2));
    Serial.println(greeting1);
    Serial.println(greeting2);

  }
  else if (topic_str == "BM280-pressure") {
    
    pressure = payload_str.substring(0, payload_str.indexOf(".")+3);
  
    pressure = pressure.toFloat() * 0.01;
    Serial.println(pressure);
  

  }
    else if (topic_str == "BM280-temperature") {
  
    balcony_temp = payload_str.substring(0, payload_str.indexOf(".")+3);
   
    Serial.println(balcony_temp);
  

  }
  Serial.println();




}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      // client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("living_room_dht");
      client.subscribe("dallasOutdoor");
      client.subscribe("BM280-pressure");
      client.subscribe("BM280-temperature");
      client.subscribe("greeting");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup()
{
 // last_cycle = millis();
  
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Smart Home");
  lcd.setCursor(0, 1);
  lcd.print("Center");
  delay(2000);
  lcd.clear();
  //pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);//add user and password as parameters here if necessary
  client.setCallback(callback);

}
void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  if (first_loop == true){

    
    last_cycle = millis();
    //this_cycle = millis();
    
  first_loop = false;
   }
  
  if ((millis() - last_cycle) > 18000){
    first_livingTemp = true;
first_greeting = true;
first_livingHum = true;
first_balconyTemp = true;
first_pressure = true;
first_outsideTemp = true;
  last_cycle = millis();}
  
  
 else if ((millis() - last_cycle) > 15000){
    if (first_livingTemp == true){
    lcd.clear();
    //this_cycle = millis();
  
  lcd.setCursor(0, 0);
  lcd.print("Living Room Temp.");
  lcd.setCursor(0, 1);
  lcd.print(living_room_temperature + "C");
  Serial.println("livin room temp");
    
  first_livingTemp = false;
   }
  }
  
  else if ((millis() - last_cycle) > 12000){
     if (first_outsideTemp == true){
    lcd.clear();
 
  lcd.setCursor(0, 0);
  lcd.print("Outside Temp.");
  lcd.setCursor(0, 1);
  lcd.print(outside_temperature + "C");
  Serial.println("outside temp");
  
 }
 first_outsideTemp = false;}
 
else if ((millis() - last_cycle) > 9000){
 if (first_balconyTemp == true){
    lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Balcony Temp.");
  lcd.setCursor(0, 1);
  lcd.print(balcony_temp + "C");
  Serial.println("balc temp");
  }
  first_balconyTemp = false;
}
  else if ((millis() - last_cycle) > 6000){
    if (first_pressure == true){
    lcd.clear();
   lcd.setCursor(0, 0);
  lcd.print("Balcony Pressure");
  lcd.setCursor(0, 1);
  lcd.print(pressure + "hPa");
  Serial.println("pressure");
    }
    first_pressure = false;
  }
 else if ((millis() - last_cycle) > 3000){
if (first_livingHum == true){
    lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Living Room Hum.");
  lcd.setCursor(0, 1);
  lcd.print(living_room_humidity + "%");
  Serial.println("livin room hum");
}
first_livingHum = false;
  }
  else {
   if (first_greeting == true){
    lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(greeting1);
  lcd.setCursor(0, 1);
  lcd.print(greeting2);
  Serial.println("greeting");
  }
  first_greeting = false;
  }
  
  
  Serial.println(last_cycle);
    
    

}