This thesis describes the process of designing, creating and implementing an alarm system based on the ESP32 microcontroller. The system is equipped with various sensors and components, including a display, keypad, buzzer, temperature sensor, RFID module, power supply, and reed relay. The goal of the project was to create a functional and reliable alarm system that can be remotely controlled via the Blynk mobile application. The thesis begins with a description of IoT technologies and a theoretical overview of the system components. The practical part of the thesis focuses on the process of connecting and programming the ESP32 microcontroller. The steps for connecting all components are described in detail. A special part of the thesis is dedicated to the design and assembly of the enclosure. The enclosure was designed using SketchUp and made from MDF material, ensuring the protection of components and a compact system. The final part of the thesis describes the implementation of the Blynk application, which allows remote control and monitoring of the system via a mobile device.