I. System Architecture
1. Text Description
The system adopts a three-layer architecture: Perception Layer, Control Layer, and Application Layer.
- Perception Layer
- Flexible SBR Fabric Sensor: Embedded in seats or mattresses to collect signals such as posture, body movement, bed exit status, and respiration.
- NTC Temperature Sensors: Arranged at multiple points on the heating pad surface for real‑time temperature monitoring.
- Environmental Sensors (optional): Temperature, humidity, and light sensors for adaptive control.
- Control Layer
- Signal Conditioning Circuit: Amplification, filtering, and analog‑to‑digital conversion.
- Microcontroller Unit (MCU): Runs embedded algorithms to process sensor data, execute PID temperature control, and detect abnormal events.
- Drive Circuit: MOSFET or relays to control the power supply to the graphene heating pad.
- Communication Module: Wi‑Fi / Bluetooth / LoRa / 4G for uploading data to the cloud and receiving remote commands.
- Application Layer
- Cloud IoT Platform: Device management, data storage, and rule engine (e.g., bed‑exit alarm, automatic heating).
- Mobile App / Mini‑Program: Provides real‑time status, push notifications, and remote temperature adjustment for family members or caregivers.
- Institution Management Dashboard: Centralized monitoring for multiple beds, energy consumption statistics, alarm logs, and report export.