Smart thermostat,smart home iot temperature control system.esp8266 and flutter project.

Introduction

Welcome to this comprehensive tutorial on creating a Smart Thermostat with ESP8266 and Flutter. In this tutorial, we will guide you through the process of building a smart temperature control system that can be controlled remotely using a mobile app developed using Flutter.

The Smart Thermostat system consists of the following components:

1. ESP8266 WiFi Module: This is a microcontroller that connects your thermostat to the internet via WiFi.
2. Temperature Sensor: This module measures the temperature and humidity of the environment.
3. Relay Module: This module controls the heating or cooling system by switching the power on and off.
4. Flutter App: This is the mobile app that allows users to control the thermostat remotely using their smartphone.

The benefits of this system are:

• Remote temperature control: Users can control the temperature of their home remotely using the Flutter app.
• Real-time temperature monitoring: Users can monitor the current temperature and humidity in real-time using the app.
• Energy efficiency: The system can be set to automatically turn off the heating or cooling system when the room reaches a set temperature, reducing energy consumption.

Hardware Requirements

• ESP8266 WiFi Module
• Temperature and humidity sensor (e.g. DHT11)
• Relay Module
• Breadboard and jumper wires
• Power supply (e.g. USB battery pack)
• Smartphone with WiFi and internet connection

Software Requirements

• Arduino IDE (for writing the ESP8266 firmware)
• Flutter SDK (for developing the mobile app)
• Android Studio (for developing the mobile app)

Step 1: Setting up the ESP8266

1. Connect the ESP8266 WiFi module to your computer using a USB cable.
2. Open the Arduino IDE and create a new project.
3. Copy and paste the following code into the Arduino IDE:

   
   #include <WiFi.h>
   #include <DHT.h>

const char ssid = "your_wifi_ssid"; const char password = "your_wifi_password";

WiFiServer server(80);

DHT dht(2, DHT11);

void setup() { Serial.begin(115200);

WiFi.begin(ssid, password); while (WiFi.status()!= WL_CONNECTED) { delay(1000); Serial.println("Connecting to WiFi..."); } Serial.println("Connected to WiFi"); server.begin(); }

void loop() { // read temperature and humidity data from DHT sensor float temperature = dht.readTemperature(); float humidity = dht.readHumidity();

// send data to client (mobile app) WiFiClient client = server.available(); if (client) { client.println("HTTP/1.1 200 OK"); client.println("Content-Type: application/json"); client.println(); client.print("{"temperature":""); client.print(temperature); client.print(""}"); client.println("}"); } }

4. Replace "your_wifi_ssid" and "your_wifi_password" with your actual WiFi network credentials.
5. Compile and upload the code to the ESP8266.

**Step 2: Setting up the Relay Module**

1. Connect the relay module to the breadboard.
2. Connect the relay module to the ESP8266 as follows:
    * VCC (relay module) -> VCC (ESP8266)
    * GND (relay module) -> GND (ESP8266)
    * IN1 (relay module) -> D5 (ESP8266)
    * IN2 (relay module) -> D6 (ESP8266)

**Step 3: Setting up the Temperature Sensor**

1. Connect the temperature sensor to the breadboard.
2. Connect the temperature sensor to the ESP8266 as follows:
    * VCC (temperature sensor) -> VCC (ESP8266)
    * GND (temperature sensor) -> GND (ESP8266)
    * DHT (temperature sensor) -> D2 (ESP8266)

**Step 4: Building the Flutter App**

1. Open Android Studio and create a new Flutter project.
2. Create a new file called `temperature_controller.dart` and paste the following code:

import 'package:flutter/material.dart';

class TemperatureController with ChangeNotifier { double _temperature = 0.0;

double get temperature => _temperature;

void updateTemperature(double temperature) { _temperature = temperature; notifyListeners(); } }

3. Create a new file called `main.dart` and paste the following code:

import 'package:flutter/material.dart'; import 'package:flutter_localizations/flutter_localizations.dart'; import 'temperature_controller.dart';

void main() { runApp(MyApp()); }

class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Smart Thermostat', localizationsDelegates: [ GlobalCupertinoLocalizations.delegate, GlobalMaterialLocalizations.delegate, GlobalWidgetsLocalizations.delegate, ], supportedLocales: [ Locale('en', 'US'), ], home: TemperatureHomePage(), ); } }

class TemperatureHomePage extends StatefulWidget { @override _TemperatureHomePageState createState() => _TemperatureHomePageState(); }

class _TemperatureHomePageState extends State { final temperatureController = TemperatureController(); final _formKey = GlobalKey(); double _temperature;

@override void initState() { super.initState(); temperatureController.updateTemperature(22.0); }

@override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Smart Thermostat'), ), body: Form( key: _formKey, child: Column( children: [ TextFormField( decoration: InputDecoration( labelText: 'Temperature (°C)', ), validator: (value) { if (value.isEmpty) { return 'Please enter the temperature'; } return null; }, onSaved: (value) => _temperature = double.parse(value), ), SizedBox(height: 20), ElevatedButton( child: Text('Set Temperature'), onPressed: () { if (_formKey.currentState.validate()) { _formKey.currentState.save(); temperatureController.updateTemperature(_temperature); } }, ), SizedBox(height: 20), FutureBuilder( future: temperatureController.temperature, builder: (context, snapshot) { if (snapshot.hasData) { return Text('Temperature: ${snapshot.data.toStringAsFixed(1)} °C'); } return CircularProgressIndicator(); }, ), ], ), ), ); } }

4. Run the app on a physical or virtual device.

**Conclusion**

In this tutorial, we have created a smart thermostat system using ESP8266, a temperature and humidity sensor, and a relay module. We have also developed a mobile app using Flutter that allows users to control the thermostat remotely. The system can be used to monitor and control the temperature of a room or a building remotely using a smartphone.