Jordan Littlejohn Project Portfolio

Mobile Development Developed endless runner style casual game for Android and iOS. Utilizing LibGDX, the game was developed for both platforms simultaneously. Cross-platform development allowed for a “code once, distribute to all” implementation in Java.

Implemented interstitial and banner ads using AdMob, leaderboards and achievements using Google Play Services, and Facebook share integration.

3D Modeling/Design Utilized Autodesk Inventor to create intricate 3D models and 2D drawings for clients. Server rack was modeled based on existing measurements. Electric tricycle was modeled from scratch and designed within the client’s requirements with respect to function, manufacturability, and aesthetic.

CNC Logo Branding Utilized Autodesk Inventor to design merchandise branded with company logos. Drink coasters, bookends, dog tags, and a mahogany clock were made using ShopBot CNC router, Trotec laser cutter/etcher, waterjet cutter, and vinyl cutter.

Cookie cutter was 3D printed in PLA using MakerBot Replicator. Wooden card box was made Using Trotec laser cutter/etcher.

TTU Solar Racing Team First generation single-passenger vehicle designed for competition in the American Solar Challenge. Vehicles are required to use solar power exclusively to power the vehicle’s motion and maintain battery charge.

Lightweight design was a priority as well as maximizing electrical efficiencies. Aerodynamics and aesthetics were considered in the design of the carbon fiber body.

TTU Solar Racing Team High density foam molds were carved by hand using plywood templates and were used to create the three pieces of the carbon fiber body. Carbon fiber was applied to the molds, then heated at 350 degrees Celsius under vacuum pressure to cure.

TTU Solar Racing Team The aluminum frame was designed to accommodate an average sized driver as well as the battery enclosure. The frame was subjected to extensive impact and roll-over analysis to ensure that it provided adequate protection to the driver.

TTU Solar Racing Team The rear suspension was designed to house the NGM SCM150 in hub regenerative motor. Rims were custom made to fit onto the motor. Finite Element Analysis was performed on the braking, steering, and suspension components to ensure that they would not fail under static or dynamic forces.

TTU Solar Racing Team The electrical system was designed to be as efficient as possible with 500 silicon solar cells powering the motor and charging the 60 lithium iron phosphate batteries. The NI sbRio on the right was used to monitor voltage and current levels which were displayed on the onboard digital display as well as transmitted to the support crew via router.

TTU Solar Racing Team Team was operated more like a small business than a student organization. Funding, materials, and components were obtained through corporate sponsors who were compensated with advertisement. Several technical documents and presentations were created for sponsors, the university, and race officials.

Research Using a combination of Java and MATLAB, water infiltration rates into various types of soils were analyzed using 5 different models. In order to determine a correlation between soil type and infiltration rate, the plot on the right was developed to better visualize the relationship and eventually model it mathematically.

Fedler, C.B., Littlejohn, J., Duan, R. and Feng, L. 2012. Refining the application rates of onsite surface application. Final Report for the Texas Commission on Environmental Quality, Project No. 582-9-350. December 15, 2012. Texas Tech University, Lubbock, TX

Undergraduate Design Portable Human Lifter Designed to fit in a standard closet and to be easily moved to desired location in home. Intended for use as a stepladder alternative, the human powered hydraulic lift is able to raise the user up to 18 inches with minimal effort. Project cost was reduced 95% to be within budget by procuring materials and components from local sponsors. The aluminum frame and locking caster wheels provide a lightweight, sturdy, easy to operate, mobile device for the elderly.

Undergraduate Design Solar Tracker Designed to follow the path of the sun by measuring the difference in current in the solar cells caused by the shadow cast by the barriers.

An Arduino Uno microcontroller powered by 4 AA batteries was used to detect the 4 solar cell current readings and rotate the 2 servo motors appropriately.

Undergraduate Design T-shirt Cannon Prototype of a self-sustaining air-powered cannon. A small battery enclosure powered a portable air compressor which pressurized the air tank. A sprinkler valve with a 24 volt solenoid was used to Release the pressure and fire the T-shirt. An electrical enclosure housed the safety toggle, trigger, compressor switch, and battery pack.

Undergraduate Design Virtual Grocery Bagger Using a combination of Java and C Language Integrated Production System (CLIPS), the program sorted various groceries into bags in a virtual environment based on size, weight, and type of item. This system uses a rule based expert system to decide the best way of bagging groceries using the fewest possible bags, while also avoiding over-packing, according to grocery store standards. This program was intended to be combined with a robotic apparatus and a visual recognition system for implementation as an automatic grocery bagger.

Undergraduate Design Squeeze-it AI Java was used to implement an AI that could play a checkers-like game against human players and other AI players. Using a unique method of heuristic decision making, this implementation was able to easily defeat all of the other AI players within 20 moves or less. It was found that the program would unexpectedly create traps by sacrificing one of its own pieces in order to take 2 of the opponents pieces on the next turn.

Undergraduate Design Twilight Imperium Online A digital implementation of the board game, Twilight Imperium, was created using Java. The complex rules and gameplay are more easily managed in a digital environment. Due to the extensive amount of content, game setup is significantly quicker digitally. The game was designed to retain the look and feel of the original, using most of the elements from the actual board game and digitizing only where necessary.