A double entry door at the front of the building can save energy by creating an airlock, which prevents escaping hot or cold air while entering and exiting the building. However, I found that people can frequently open unwanted doors due to confusion.

Identifying the Problem

In TSRB at Georgia Tech, there are two similar switches in the double door entry. Each switch can only control one of the doors in the entry.

Observing Behaviors

For All the People - I found that the door switches have used by not only disabled people but also other people who have packages in one hand or both hands.
Hard to Find - When people opened one of the doors in the double door entry, they frequently failed to recognize which switch needs to be pushed to open another door.

Developing the Solution

Cost-Effective Method - I examined all the possible materials and methods (e.g., 3D printing, laser cutting) to solve this problem concerning cost and effectiveness. And, I found a $1 solution that takes less than 5 minutes to make.
Usability - I could not conduct a rigorous experiment to measure the usability of the proposed solution. But I interviewed a few people, and they recognized the mapping between switches and doors instinctively. This design also can give tangible feedback about the direction for the visually impaired while touching it.

Presentation in the Design Contest