Karna Prototype: Bluetooth-Enabled Hearing Aid with Proximity Alarm Functionality

Design Idea

The hearing aid is designed to enhance hearing capabilities while integrating a Bluetooth-enabled proximity alarm. When paired with devices like smartphones or smartwatches, the hearing aid will ring or vibrate if the connected device moves beyond 10 feet from the user. The compact, ergonomic design will ensure comfort and seamless usability.

Key Components

1. Bluetooth Module (e.g., Bluetooth 5.0):

Enables connectivity with smartphones, smartwatches, or other devices for alarm triggering and audio streaming.

2. Microprocessor (e.g., ARM Cortex):

Processes proximity data, Bluetooth signals, and hearing amplification functions.

3. Speaker Unit:

Provides sound amplification and alarm tones.

4. Microphone Array:

Captures ambient sound for hearing aid functionality.

5. Proximity Sensor/Module:

Measures the distance between the hearing aid and connected Bluetooth devices using signal strength (RSSI).

6. Rechargeable Battery (Li-ion):

Powers the device with a long-lasting charge, enabling day-long usage.

7. Haptic Feedback Motor (Optional):

Provides vibration alerts for proximity alarms, suitable for users with severe hearing loss.

8. LED Indicator:

Provides a visual cue for proximity alerts or low battery warnings.

9. Housing:

Compact, lightweight, and ergonomic housing for behind-the-ear (BTE) or in-the-ear (ITE) designs.

---

Mechanism

1. Bluetooth Pairing:

The hearing aid pairs with a smartwatch or smartphone via Bluetooth.

It continuously measures the RSSI (Received Signal Strength Indicator) to detect distance.

2. Proximity Monitoring:

If the connected device moves beyond 10 feet (configurable), the RSSI drops below a threshold value.

The device triggers an alert through sound, vibration, or both.

3. Hearing Amplification:

The device amplifies surrounding sounds using a microphone and speaker system for individuals with hearing impairment.

4. Battery Optimization:

Low-power Bluetooth and energy-efficient components ensure minimal battery drain.

---

Applications

1. Alarm for Lost Devices:

Prevents users from misplacing essential devices like smartphones, ensuring they remain connected.

2. Enhanced Safety:

Alerts caregivers or individuals when a user accidentally leaves behind their connected devices.

3. Dual Functionality:

Combines hearing aid features with smart tech, reducing the need for multiple gadgets.

---

Benefits to Community

1. Improves Accessibility:

Ensures users with limited hearing capabilities are equipped with both assistive and safety technologies.

2. Empowers Independence:

Reduces the reliance on caregivers by integrating smart alarms.

3. Affordable Solution:

Reduces the need for separate gadgets, offering a cost-effective way to address multiple challenges.

4. Customizable Alerts:

Vibratory, auditory, and visual alerts ensure inclusivity for users with varying levels of hearing impairment.

5. Peace of Mind:

Helps users stay mindful of their belongings and connected devices, reducing anxiety.

---

Future Enhancements

Integration with GPS:

Add a location-tracking feature for recovering lost devices.

Health Monitoring Features:

Incorporate sensors for heart rate or fall detection for elderly users.

AI-Driven Sound Filtering:

Enhance speech recognition and noise cancellation for better hearing aid performance.