In response to the escalating issue of parking space scarcity in urban areas, an automated microcontroller-based parking system is proposed. This system employs RFID technology for secure entry and fee settlement while efficiently managing parking allocation through LCD display and I2C module. Additionally, a study on passive RFID tag-to-tag communication is presented, emphasizing energy efficiency and operational enhancements. Furthermore, a comprehensive analysis of various smart parking systems is conducted, evaluating their technological aspects, environmental suitability, and user interfaces to facilitate informed decision-making for researchers, designers, and policymakers in addressing urban parking challenges. This book is about the implementation of IoT based smart car parking system using ESP32 and RFID.