This paper introduces a dual-mode communication infrared security system based on microcontroller technology, utilizing both active and passive infrared detectors for intrusion detection. The microcontroller processes and controls data to ensure accurate detection and effective alarm functions. Upon detecting an intrusion, the sensor transmits a signal to the microcontroller, which processes the data and uses software algorithms to confirm the intrusion, thereby triggering audible alarms, visual alerts, and real-time notifications to the user's mobile phone. Experiments demonstrate that this security system can accurately detect intrusions and promptly trigger alarms. Compared to traditional systems, this design provides timely communication, allowing users to take immediate action. It offers diverse alarm functionalities, fully utilizing different modules to ensure accurate and timely notifications in various environments, enhancing both practicality and reliability.