DESIGN AND CONSTRUCTION OF A LIFI BASED WIRELESS PATIENT ALERT SYSTEM

This paper explores the design and implementation of a Li-Fi based Wireless Patient Alert System as a safe and interference free alternative to the conventional RF-based communication systems in the health care setting. As the use of wireless technology in hospitals increases, medical personnel are faced with the challenge of electromagnetic interference, congestion of bandwidth and possible security weaknesses that compromise patient safety and efficiency of communication. To counter these difficulties, the project leverages on Light Fidelity (Li-Fi) technology that uses visible light to provide high-speed, secure and reliable data transfer. The system to be studied consists of four main parts • A transmitter module with a high-brightness light-emitting diode that is modulated through On-Off Keying. • A receiver module that includes a Light Dependent Resistor to detect the signal. • An ESP32 microcontroller to process the data. • An IoT dashboard to monitor alerts in real-time. The results of the experiments have shown that emergency signals produced at the bedside of a patient can be reliably conveyed to a nursing station and be shown there at the same time as the web-based dashboard, and the email notification is sent out. The system in question has several salient benefits that lend it to integration into the hospital setting especially: 1. Electromagnetic immunity and hence compatibility with sensitive medical equipment. 2. Increased security, since the light signals do not pass through walls, and this significantly decreases the risks of unauthorized access. 3. Cost-effectiveness, as the suggested infrastructure will be able to utilize the existing LED lighting in order to transmit data. The research proves that Li-Fi can be used in real-time monitoring of patients in hospitals even though it has some limitations, most especially, the necessity of line- of-sight penetration and comparatively limited range of coverage. In future, it could look into studying multi-cell structures, new modulation methods, and compatibility with wearable sensors to increase scalability and functionality. To conclude, the proposed study will be a contribution to the emerging field of Visible Light Communication(VLC ) in healthcare, which can be used to ensure patient safety and the efficiency of operations in medical institutions.