Bill of Materials
This Bill of Materials outlines the core hardware components required to build the first functional prototype of Who?Cares — our smart monitoring system designed to support informal caregivers in tracking and responding to the needs of elderly individuals living alone. It complements the project's technical requirements by translating the key features — such as indoor localization, fall detection, and behavioral monitoring — into concrete components.
Required Components
| Category | Component | Quantity | Price(€) |
|---|---|---|---|
| Wearable Device (NRF52840-based) | NRF52840 (Main MCU (Wi-Fi + BLE)) | 1 | 15,4 |
| Wearable Device (NRF52840-based) | MPU6050 (IMU Sensor: Accelerometer + Gyroscope for fall detection) | 1 | 4,7 |
| Wearable Device (NRF52840-based) | Li-Po Battery (3.7V, 500mAh) | 1 | 9,38 |
| Wearable Device (NRF52840-based) | 3D-Printed Enclosure – Wearable case (can also be acrylic) | 1 | - |
| BLE Beacons (ESP32S3-based) | ESP32-S3 (Main MCU (Wi-Fi + BLE)) | 2 | 46,74 |
| BLE Beacons (ESP32S3-based) | Li-Po Battery (3.7V, 500mAh) | 2 | 18,76 |
| Raspberry Pi (Edge Computing) | Raspberry Pi 4 (Main hub) | 1 | 62,91 |
| Raspberry Pi (Edge Computing) | MicroSD Card (32GB) – OS and data storage | 1 | 5,95 |
| Raspberry Pi (Edge Computing) | Power Supply (5V 3A) | 1 | 7,59 |
| Home Sensors (Movement & Door Monitoring) | MPU6050 (IMU Sensor: Accelerometer + Gyroscope for fall detection) | 2 | 9,4 |
| Home Sensors (Movement & Door Monitoring) | NRF52840 (for movement sensors) - Sends data to Raspberry Pi | 2 | 30,8 |
| Home Sensors (Movement & Door Monitoring) | Magnetic Door Sensor (Detects door open/close) | 1 | 3,86 |
| Home Sensors (Movement & Door Monitoring) | NRF52840 (for door sensos) - Sends data to Raspberry Pi | 1 | 15,4 |
| Home Sensors (Movement & Door Monitoring) | Li-Po Battery (3.7V, 500mAh) | 3 | 28,14 |
| Home Sensors (Movement & Door Monitoring) | 3D-Printed Enclosure – Sensors case | 3 | - |
| Integration Components | Jumper Wires & Dupont Connectors (For connecting components) | 1 | - |
| Integration Components | USB Cables (for ESP32-C3, Raspberry Pi) | 1 | - |
| Integration Components | Breadboard for prototyping (Temporary circuit setup) | 1 | - |