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In STEM II, taught by Dr. Crowthers, we continue to improve both our ability to read and write technical material. STEM II is basically a group-based version of an engineering STEM I project.

Visi-Vest: A Device to Warn VIPs of Above-Waist Obstacles

Problem Statement

Oftentimes, visually impaired persons (VIPs) use white canes or guide animals to navigate their environment. However, these aids are unable to detect obstacles above waist height. This means that VIPs are at risk of collisions with objects that the cane cannot detect, putting white cane users at risk of injuring themselves without aid from a sighted person.

Engineering Goal

Design a device to help visually impaired individuals (VIPs) navigate their environments independently, without fear of being injured by an object they can't see or detect without aid.

Design 1: This design consists of a series of straps and buckles, similar to a harness, that can hold 3D printed boxes which contain the sensors and technology. This system utilizes an ultrasonic sensor, speaker, vibration motor, arduino, and button to switch between audio and tactile modes. The design is modular because the units can slide on and off the straps, but somewhat complicated to put on or take off and bears resemblance to a dog harness, making it unappealing to wear for the target audience. The sensors are also all over the vest, and the wires may not be able to connect easily.

Design 2: This design is similar to the first design, with 3D printed modules to hold the technology connected by a series of straps, but the modules are larger and the arduino and an additional ultrasonic sensor are on the back. This device has the advantage of being somewhat simpler, but is much bulkier and the location of the arduino on the back makes it uncomfortable to lean back in a chair and could potentially be blocked by the user’s hair.

Design 3 (Chosen Design): This design uses the same system of straps and individual units for each component as the first design, but connects these to a pre-sewn vest instead of relying entirely on the buckle-and-strap system. This design was formulated after talking to VIPs, who pointed out the other designs’ resemblance to a dog harness. This system is easier to navigate independently and also has more of a sleek design, while still retaining the modularity of the first design. It may be more expensive due to the additional cost associated with the purchase of the vest.