Opsis

Competitive Analysis

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Perception

Perception uses depth sensor with haptic feedback to solve obstacle detection.

Opsis provides better user experience by eliminating unnecessary movements during obstacle detection.

Ultracane

Ultra Cane uses ultrasonic sensors to detect an area around the tip of the cane.

Opsis provides much better precision and better user experience because Opsis utilizes much more vibration sensors with large FOV.

Tech Specs / Requirements

Functional requirements

Detects all obstacles that are within 3.5 meters (FOV: 90° horizontal and 70° vertical)
Depending on the distance from obstacles to user, the 10 vibration motors independently feed backs different strength of vibrations
Allows optional location/room detection and notification via sound
Whole system is controlled by simple 3 voice commands:
- Start: starts the program
- Stop: stops the program
- Location: performs location detection
Response time is less than 250ms
Entire system lasts up to 2.2 hours

Non-functional requirements

Durable
Lightweight
Easy to wear & take off

Interaction Diagram

This diagram shows how our componenets interact with each other.

Once the user starts the program by speaking “start” into the mic, the Intel Compute Stick receives depth data from the depth sensors and generates vibration commands. This command gets sent to the MCU and corresponding vibration motors on the waistband vibrate.

To do location detection, the user can say “location”. This triggers the Intel Compute Stick to receive rgb image data from the depth sensor and send it to Google’s Cloud Vision API. Google Cloud Vision processes the image based on the objects in the image and generates location label, such as “kitchen” or “bathroom”. This location label is then sent to the user as sound.

To shut the device down, the user can say “stop”.

Opsis Front View

Opsis Back View

Architecture

1. architecture diagram

This diagram shows the 2 primary processing blocks. The left block receives commands over BLE to power our haptic feedbacks system. The second block processes information from the depth sensors and sends the relevant information to speaker via aux cable.

2. Bluetooth MCU

This schematic primarily interfaces the MCU with the components needed for it to operate. It also displays the connection between the antenna and the MCU.