1. Automatic room light controller with visitor counter. 2. RFID-based attendance system using a microcontroller. 3. Smart irrigation system using a microcontroller. 4. Home automation using GSM and microcontroller. 5. Smart traffic light control system using a microcontroller. 6. Digital voltmeter using microcontroller. 7. Wireless temperature monitoring using a microcontroller. 8. Voice-controlled home automation system using a microcontroller. 9. Automatic water level controller using a microcontroller. 10. PIR sensor-based security system using a microcontroller. 11. Energy meter monitoring system using a microcontroller. 12. GSM-based home security system using a microcontroller. 13. Real-time clock using a microcontroller. 14. Fire detection and alarm system using a microcontroller. 15. Smart dustbin with waste segregation using a microcontroller.