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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.   2. Mermaid Diagram The following Mermaid code can be used to generate the architecture diagram: II. BOM Cost Estimation (Per System, Based on 1,000‑Unit Mass Production) Note: Prices are estimated. Actual costs depend on order volume, suppliers, and customization. The flexible SBR sensor and graphene heating pad are patented core components; their unit prices are estimated based on similar flexible electronics. ComponentQtyUnit Price (USD)Subtotal (USD)Remarks Flexible SBR Fabric Sensor 1 set 5.00 5.00 Includes conductive fabric and leads; custom size Flexible Graphene Heating Pad 1 set 6.50 6.50 Includes graphene film, insulation layer, leads NTC Temperature Sensors 2 pcs 0.20 0.40 Multi‑point sensing for enhanced safety MCU (ESP32 or STM32) 1 pc 1.70 1....

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