Abstract: This paper presents a smart home automation system designed using the STM32F103C8T6 microcontroller and ESP8266 Wi Fi module for efficient monitoring and control of household appliances. The system integrates multiple sensors such as an LDR for automatic lighting control, an MQ 2 gas sensor for gas leakage detection, and a DHT11 temperature and humidity sensor for monitoring ambient temperature. A 3.4 V lithium-ion battery and dual power supply units are used to distribute power to components including IR sensors, a servo motor, and other modules. The LDR detects day and night conditions and automatically controls lighting through a relay based on programmed threshold values in the microcontroller. The MQ-2 sensor identifies gas leakage and provides an alert indication, while the DHT11 sensor activates an air-conditioning relay when the temperature exceeds a predefined threshold. Additionally, two IR sensors and a servo motor are used to implement an automatic door system that opens when a person approaches and closes after passing through. A capacitive touch module is also included to allow manual door operation for safety. The proposed system provides a low-cost, efficient, and intelligent solution for home automation, improving convenience, safety, and energy management.

Keywords: Smart Home Automation, STM32F103C8T6 microcontroller, ESP8266 Wi Fi module, MQ-2 gas sensor, DHT11 temperature and humidity sensor, LDR Sensor, IR Sensor, Servo Motor, Gas Leakage Detection, Temperature Monitoring, Automatic Door System, IoT-based Monitoring, Energy Management.

Downloads: | DOI: 10.17148/IJIREEICE.2026.14378