Project
| # | Title | Team Members | TA | Documents | Sponsor |
|---|---|---|---|---|---|
| 48 | Sleep Position Trainer |
Brian Park Kyle Lee Nick Tse |
Po-Jen Ko | design_document1.pdf final_paper1.pdf proposal1.pdf video1.mp4 video |
|
| **Team Members:** Brian Park (brianp7) Kyle Lee (klee281) Nick Tse (nstse2) **Problem:** Sleep is essential for overall health and recovery. We want to develop a device that can detect a person’s sleeping position and provide gentle feedback, via vibration, to prompt repositioning. This device is intended to help users improve and maintain healthier sleep patterns. **Solution:** In order to maintain healthy sleep posture, we propose a wearable sleep monitoring device that detects a user’s sleeping position and provides gentle vibration feedback when an adjustment is needed. The device continuously monitors body orientation during sleep and encourages repositioning when prolonged or unhealthy postures are detected, helping users develop healthier sleep habits over time. The system will incorporate a Battery, Microcontroller, Inertial Measurement Unit (IMU), and Eccentric Rotating Mass (ERM) motors to develop a small wearable sleep position trainer. **Solution Components:** **Subsystem 1 (Position Sensing):** Components: Bosch BMI270 IMU A 6-axis IMU will be used to determine whether the user is laying on their back or side. The microcontroller continuously estimates the device’s tilt/roll angle relative to gravity. When the estimated orientation corresponds to a supine posture for longer than a defined time window, the system will know to activate the vibrations. **Subsystem 2 (User Alert System):** Components: Parallax Inc. 28821 DC Motor Vibration, ERM (Haptic) 9000 RPM 3VDC This vibration mechanism will train the user to not sleep on their back. The device will keep vibrating until the user has turned onto their side, turning off the vibration. **Subsystem 3 (Microcontroller):** Components: Espressif ESP32-S3-WROOM-1 This acts as the device's control unit. It will be responsible for interpreting sleep position based on IMU, timing logic (vibration delays and cooldowns), and vibration. **Subsystem 4 (Physical Build):** Components: 3D-printed case A compact 3D-printed case will protect the PCB, battery, and motor and keep them from shifting during sleep. The enclosure will include strap/clip mounts and ensure the vibration motor is pressed against the body for a noticeable cue, with openings for charging and any button/LED. **Subsystem 5 (Power Management):** Components: 3.7 V Lithium-Ion Battery Rechargeable (Secondary) 100mAh, TI BQ24074 charger/power-path IC, TI TPS62840 3.3 V regulator This subsystem provides rechargeable power and stable 3.3 V for the electronics. The charger safely charges the battery from USB and can allow operation while plugged in. The regulator improves battery life by efficiently converting battery voltage to 3.3 V. **Criterion For Success:** The device is considered successful if it can reliably detect when the user is sleeping on their back and activate vibration feedback during sleep to encourage repositioning, thereby helping to reduce snoring, alleviate sleep apnea symptoms, and ease heartburn or acid reflux. |
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