--- title: "iot_based_home_automation_sol" url: "https://maker.wiznet.io/Hannah/projects/iot-based-home-automation-sol/" markdown_url: "https://maker.wiznet.io/Hannah/projects/iot-based-home-automation-sol/md" type: "UCC: User Created Content" author: "Sourabh Shenoy" author_url: "https://github.com/sourabhshenoy04/iot_based_home_automation_sol" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "Sourabh Shenoy" original_url: "https://github.com/sourabhshenoy04/iot_based_home_automation_sol" published: "2024-08-05" language: "en" likes: 0 views: 762 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # iot_based_home_automation_sol > To control home devices using Blynk IoT app through Blynk Cloud Server. Original author: Sourabh Shenoy (source: https://github.com/sourabhshenoy04/iot_based_home_automation_sol) ## Article ### IoT Based Home Automation Solution **Project Overview:** This project is focused on creating an IoT-based home automation solution that allows remote control of various home devices such as garden lights, a temperature system, and a water tank using the Blynk IoT app. The system integrates hardware components like sensors and actuators, and it is simulated using the PICSim Lab Emulator. ### Tech Stack and Components: **Hardware:** 1. **LDR Sensor**: Used for detecting light intensity to control garden lights. 2. **LED**: Acts as the garden light. 3. **CLCD hd 44780**: A character LCD for displaying system status. 4. **Arduino UNO (atmega328p)**: The main microcontroller used for interfacing with sensors and actuators. 5. **Ethernet Shield (ETH w5500)**: Provides internet connectivity to the Arduino. 6. **Temperature System**: Includes a heater and cooler for managing home temperature. 7. **Water Tank (Serial Remote Tank)**: For simulating a water tank's inlet and outlet control. **Software/Tools:** 1. **Arduino IDE**: For programming the Arduino board. 2. **PICSim Lab Emulator**: For simulating the hardware setup. 3. **Blynk Application**: Both mobile and web versions to control and monitor the system. **Languages Used:** - Embedded C/C++ ### Key Features and Working: **Garden Light Control:** - **Goal**: Lights are off during the day and on at night. - **Working**: Uses an LDR sensor to measure light intensity. When the ambient light is low, resistance increases, turning the LED on. Conversely, during high light conditions, the LED turns off. **Temperature System Control:** - **Goal**: Remote control of heater and cooler using the Blynk app. - **Working**: The system reads temperature from the sensor and displays it on the CLCD and mobile app. If the temperature exceeds 35°C while the heater is on, it automatically turns off and sends a notification to the mobile app. **Water Tank Control:** - **Goal**: Manage water tank levels and control inlet/outlet valves. - **Working**: The system reads the tank's water volume and displays it on the CLCD and mobile app. If the water level drops below 2000L, the inlet valve turns on automatically, and a notification is sent. When the level reaches 3000L, the inlet valve turns off, and another notification is sent. ### W5500 Ethernet Shield Usage: The **W5500 Ethernet Shield** plays a crucial role in providing internet connectivity to the Arduino board, enabling it to communicate with the Blynk Cloud Server. Here’s how it is used in the project: **Initial Setup:** - Libraries for SPI and Ethernet are included (`SPI.h` and `Ethernet.h`). - The `BlynkSimpleEthernet.h` library is used to interface with the Blynk app. **Network Configuration:** - The Ethernet shield is configured to connect to the local network using DHCP or a static IP address. - The Blynk authentication token, device name, and template ID are set up to link the hardware with the Blynk server. **Communication:** - The Ethernet shield enables the Arduino to send and receive data from the Blynk cloud. - Sensor data (temperature, light intensity, water volume) is sent to the Blynk app. - Control commands from the Blynk app (e.g., turning on/off the heater or cooler) are received and executed by the Arduino. ### Code Structure: **home_automation_blynk_controlled.ino**: Main Arduino sketch - **Setup and Definitions**: Includes libraries and sets up Blynk, LCD, temperature system, LDR, and serial tank. - **Looping**: Executes Blynk and timer tasks. - **Display**: Updates temperature and water volume on the CLCD. - **Control Logic**: Manages garden lights, temperature control, and water tank valves based on sensor readings and Blynk app inputs. **ldr.cpp and ldr.h**: LDR sensor handling - **Initialization**: Sets up LDR sensor pin modes. - **Brightness Control**: Adjusts garden light brightness based on LDR readings. **serial_tank.cpp and serial_tank.h**: Water tank control - **Serial Communication**: Manages communication with the water tank system. - **Valve Control**: Functions to enable or disable inlet and outlet valves. **temperature_system.cpp and temperature_system.h**: Temperature system control - **Initialization**: Sets up temperature sensor and control pins. - **Temperature Reading**: Converts analog readings to temperature values. - **Heater/Cooler Control**: Functions to control heater and cooler states. ### Setting Up Blynk IoT App: 1. **Create Account**: Register on the Blynk web version. 2. **Create Template**: Define a template named ‘Home Automation’. 3. **Add Device**: Link the device with the Blynk server using the template ID and auth token. 4. **Add Datastreams**: Configure data streams for sensors and actuators. 5. **Setup Widgets**: Add widgets in the mobile app to control and monitor the system. 6. **Arduino IDE Setup**: Install necessary libraries, write the code, compile, and upload the HEX file to the PICSim Lab Emulator. ### Demonstration: A complete demonstration of the project is available in a YouTube video: [Home Automation using Blynk and Arduino](https://www.youtube.com/watch?v=JTmT7ICp2aE&ab_channel=SourabhShenoy). This project illustrates how IoT technology can be leveraged for home automation, providing convenience, efficiency, and remote monitoring/control capabilities through a user-friendly mobile interface. --- Source: https://maker.wiznet.io/Hannah/projects/iot-based-home-automation-sol/