A complete, end-to-end IoT home automation project featuring an ATmega8A real-time AC controller, an ESP-01S Wi-Fi gateway, and a cross-platform Flutter mobile application.
This repository contains the complete source code, hardware schematics, and mobile app for a custom-built smart home controller. The system is designed to provide robust, real-time control over high-voltage AC appliances with seamless Wi-Fi connectivity and a beautiful mobile user interface.
- Phase-Angle Triac Dimming: Deterministic, hardware-timer-based AC fan speed control (levels 1-9).
- Zero-Cross Synchronization: Uses hardware interrupts for precise AC wave timing and noise recovery.
- REST API & WebSockets: Instantaneous bi-directional communication between the app and the hardware.
- Wi-Fi Provisioning: Captive portal fallback for easy network configuration straight from the app.
- Over-The-Air (OTA) Updates: Flash the ESP-01S directly from the mobile app.
- Infrared (IR) Fallback: SIRC-12 remote control decoding for physical TV remote support.
- State Persistence: ATmega8A EEPROM retains the exact device state (power, fan speed, lights) across power outages.
/Firmware/atmega8a_firmware/: Real-time C++ firmware for the ATmega8A (Triac dimming, IR, Zero-cross)./Firmware/esp01s_firmware/: C++ firmware for the ESP8266 (REST API, WebSocket server, mDNS, OTA)./Home_App/: Flutter mobile application (UI, Settings, API client, WebSocket listener)./Pictures_PCB_Schematics/: Hardware schematics, PCB layouts, and 3D renders.
The custom PCB centers around an ATmega8A microcontroller and an ESP-01S module as a gateway.
- Outputs: 1x Fan (Triac dimming via PD3), 2x Lights (Relays on PC0, PC1), 1x Socket (Relay on PC5).
- Inputs: Zero-Cross Detector (INT0/PD2), IR Receiver (PB2).
- Flash the ATmega8A:
Use an ISP programmer to flash
atmega8a_firmware.inoto the ATmega8A (Requires 16 MHz external crystal fuse bits). - Flash the ESP-01S:
Flash
esp01s_firmware.inousing an FTDI adapter. It will host aHomeAuto_XXXXWi-Fi network initially. - Run the Flutter App:
Navigate to
/Home_App, runflutter pub get, andflutter runto launch the app on your mobile device.
Note: For a deep dive into the system architecture, serial communication protocol, and REST API, please see DOCUMENTATION.md.
Designed & Developed by Md. Omar Faruk Tazul Islam