# Title Team Members TA Documents Sponsor
58 Orthopedic Chair
Alex Shen
Emre Ulusoy
Pablo Corral Vila
Kexin Hui design_review
Bad posture is a serious issue that is prevalent in society. It feels natural to hunch over when doing work, studying, or even playing games. Along with this, bad posture is exhibited while sitting. Since these bad poses may happen subconsciously, it may be helpful to know when bad posture is being used.

Our project idea is to build a couch/chair that provides orthopedic feedback to the user. We spend a great portion of our day sitting down whether it be for work or leisure time. We figured that we might as well create some sort of system that informs the user of posture habits and potential orthopedic hazards. Our idea is in its preliminary stages, so we are open to further developing our scope for the project. The chair will be embedded with pressure sensors on its seat and its back. The pressure readings from the glutes, lumbar and upper back will be used to evaluate the posture of the user. Along with this, we can mount a range sensor on the back of the chair to measure the distance between the user and the back since slouching tends to increase that distance. Our project is an innovation, and the most similar thing we could find is a product called Axia Smart Chair. It is a chair that provides the user “direct feedback by means of a vibration signal in the seat cushion and a personal App”.

Electronic Automatic Transmission for Bicycle

Tianqi Liu, Ruijie Qi, Xingkai Zhou

Featured Project

Tianqi Liu(tliu51)

Ruijie Qi(rqi2)

Xingkai Zhou(xzhou40)

Sometimes bikers might not which gear is the optimal one to select. Bicycle changes gears by pulling or releasing a steel cable mechanically. We could potentially automate gear changing by hooking up a servo motor to the gear cable. We could calculate the optimal gear under current condition by using several sensors: two hall effect sensors, one sensing cadence from the paddle and the other one sensing the overall speed from the wheel, we could also use pressure sensors on the paddle to determine how hard the biker is paddling. With these sensors, it would be sufficient enough for use detect different terrains since the biker tend to go slower and pedal slower for uphill or go faster and pedal faster for downhill. With all these information from the sensors, we could definitely find out the optimal gear electronically. We plan to take care of the shifting of rear derailleur, if we have more time we may consider modifying the front as well.

Besides shifting automatically, we plan to add a manual mode to our project as well. With manual mode activated, the rider could override the automatic system and select the gear on its own.

We found out another group did electronic bicycle shifting in Spring 2016, but they didn't have a automatic function and didn't have the sensor set-up like ours. Commercially, both SRAM and SHIMANO have electronic shifting products, but these products integrate the servo motor inside the derailleurs, and they have a price tag over $1000. Only professionals or rich enthusiasts can have a hand on them. As our system could potentially serve as an add-on device to all bicycles with gears, it would be much cheaper.

Project Videos