# Title Team Members TA Documents Sponsor
51 Rolling Pet Toy
Matthew Bonderski
Rachel Ziegler
Tyler Graham
Yuchen He TA other
Owners often feel bad leaving their pets at home for long periods of time because they get bored, may be more destructive to items around the house, and do not get enough exercise throughout the day. This is a problem, especially for puppies, because if they do not get enough exercise they have a harder time with training and obedience.

Our vision for a solution to this problem is a small, durable, sphere-shaped toy to engage the dog throughout the day. There would be a rechargeable battery and power converter for the power supply. The control system would incorporate user settings from an app via Bluetooth relaying which times of the day the owner would like the dog to be active. To make the toy more interactive, custom infrared motion detectors on all sides of the ball would activate movement of the ball when the dog comes near it. The sounds from a custom speaker/amplifier/filter system could also attract the pet to the toy (through doorbell or other tones) at certain times set by the app.

Once the pet is interested, the toy will roll away, avoiding walls and objects using feedback from four mounted IR sensors around the edge of the ball.

The motion of the toy will be controlled by two wheels that will be screwed into the sides of the machine shopped ball. These wheels will allow an axis to be adhered to a stepper motor that is independent of the other side. The wheels will be able to freely turn but due to their attachment to the sphere it will cause the sphere to roll.This will allow the system to perform turns and correct itself if need be. The design choice of a stepper motor is to allow for measurement of the angle of rotation without the usage of a position sensor to be used in correction feedback loops. The design of the locomotion of the sphere was based off of this project:

The rest of the control and power supply components would be attached to the central axis through the middle of the ball, held in a box that swings freely as the ball rolls to act as a counterweight.

As a reach goal, a camera module could be incorporated so the owner can see how often the pet was engaged during the day.

The difficulty in this project comes in the effort to design the controls PCB, and package it in a small and durable way so the toy can fit under furniture. We also must have low power consumption to make the play time last longer so the dog can be exercised all day.

Filtered Back – Projection Optical Demonstration

Tori Fujinami, Xingchen Hong, Jacob Ramsey

Filtered Back – Projection Optical Demonstration

Featured Project

Project Description

Computed Tomography, often referred to as CT or CAT scans, is a modern technology used for medical imaging. While many people know of this technology, not many people understand how it works. The concepts behind CT scans are theoretical and often hard to visualize. Professor Carney has indicated that a small-scale device for demonstrational purposes will help students gain a more concrete understanding of the technical components behind this device. Using light rather than x-rays, we will design and build a simplified CT device for use as an educational tool.

Design Methodology

We will build a device with three components: a light source, a screen, and a stand to hold the object. After placing an object on the stand and starting the scan, the device will record three projections by rotating either the camera and screen or object. Using the three projections in tandem with an algorithm developed with a graduate student, our device will create a 3D reconstruction of the object.


• Motors to rotate camera and screen or object

• Grid of photo sensors built into screen

• Light source

• Power source for each of these components

• Control system for timing between movement, light on, and sensor readings