Designed with EdrawMax, this template depicts an IoT home automation system architecture. It features an **Arduino Uno** microcontroller connected to sensors (tilt, humidity, PIR motion, gas) and actuators (MP3 player, RGB LED, relay). The Arduino communicates via Wi - Fi to a **Raspberry Pi 3** acting as a gateway, which processes data and sends commands to/from a **laptop** running monitoring software. The system includes a **DC power supply** and demonstrates IoT connectivity through protocols like MQTT or HTTP. Key components interact to enable remote monitoring and control of home environments, such as detecting intrusions (PIR), environmental changes (humidity/gas), or triggering alerts (MP3/LED). This visual guide aids developers in understanding IoT system integration and device communication flows for smart home applications.