Iot for Smart Homes and Energy Conservation Technologies, Applications, Challenges, and Future Perspectives

The Internet of Things (IoT) is transforming residential environments by connecting electrical appliances, sensors, smart meters, controllers, and communication networks to enable intelligent monitoring and automated control. Smart homes use IoT technologies to improve energy efficiency, reduce unnecessary electricity consumption, enhance user convenience, and support sustainable living. This paper presents a review of IoT-based smart-home systems with particular emphasis on sensing technologies, home automation, energy monitoring, communication protocols, and data privacy. It discusses how temperature, occupancy, light, and current sensors can be integrated with microcontrollers and intelligent control systems to optimize lighting, heating, ventilation, air conditioning, and other household loads. The paper also examines technologies such as Wi-Fi, Bluetooth Low Energy, Zigbee, Thread, and Matter, along with cloud-based and edge-computing approaches. Despite their advantages, IoT-enabled homes face challenges related to interoperability, cybersecurity, installation costs, reliability, and user privacy. The review concludes that combining secure communication, local intelligence, interoperable devices, and energy-aware automation can contribute to more efficient, reliable, and sustainable residential energy management.