Projectohub – IoT & Embedded Projects for Beginners

🔆 Automatic Room Lighting System 🔆 Automatic Room Lighting System Date: October 30, 2021 Purpose: Energy conservation through automation using IR sensors and a microcontroller. 🔰 Introduction Electricity is an indispensable part of modern life. However, with rising energy demands and depleting non-renewable resources, energy conservation has become a necessity . One major area where energy is often wasted is lighting—many people forget to switch off lights when leaving a room. To address this, we’ve designed an Automatic Room Lighting System , which uses IR sensors and a microcontroller (ATmega32) to automatically switch lights ON or OFF based on room occupancy. This system not only helps reduce electricity bills but also promotes responsible energy usage. 🧠 Working Principle Entry: Sensor 1 → Sensor 2 → Light ON + Counter++ Exit: Sensor 2 → Sensor 1 → Counter-- → Light OFF if Count = 0 This project is based on a bi-directional human detectio...

⚡ IoT-Based Prepaid Energy Meter ⚡ IoT-Based Prepaid Energy Meter with RF Mesh and Firebase Cloud Managing power consumption efficiently is critical, especially in shared environments like hostels, rental homes, and industrial setups. This project presents a wireless prepaid energy metering system using nRF24L01+ , ESP8266 , PZEM004T , and Firebase Firestore . The system allows real-time energy monitoring, cloud-based recharge, and automatic cut-off when balance is depleted. 🔧 System Overview Child Node: Arduino Nano + PZEM004T + Relay + nRF24L01+ Gateway (Parent Node): ESP8266 (NodeMCU) + nRF24L01+ Cloud Backend: Firebase Firestore (NoSQL) Key Features ⚡ Real-time energy measurement (Voltage, Current, Power, kWh) 💰 Prepaid balance logic with relay cut-off 📶 RF communication in scalable tree topology ☁️ Cloud integration with Firebase Firestore 📱 Recharge via Web/App or Firebase Console 📶 Multi-Level RF Topology The sys...