A FIRST LEGO league team (#144) that meets at the Carnegie Free Library of Swissvale on Saturday mornings during the fall and spring seasons. Meetings are from 9:30am to 12:30pm (including a snack break). One of the tenets of Andrew Carnegie libraries is that they offer free service to the community. In keeping with that important tenet, there is no cost to participate on the RoboCatz team.

Computer Art: the Graphical Expression of Algorithms

Mandelbrot Set

Science Demos (
Instructions: Move the mouse over an area and then use the scroll wheel to zoom in/out.

rust-mandelbrot (
Instructions: Drag the mouse to reposition the image. Use the scroll wheel to zoom in/out. (
Instructions: Change the color scheme from by selecting the dialog box item. Drag the mouse to form a box. When you lift the mouse button, the computer will zoom in on the area dragged.

2D and 3D Graphics Drawing

Maze Generation

Recursive Division Maze Generation (
Wikipedia: Mazes can be created with recursive division, an algorithm which works as follows: Begin with the maze's space with no walls. Call this a chamber. Divide the chamber with a randomly positioned wall (or multiple walls) where each wall contains a randomly positioned passage opening within it. Then recursively repeat the process on the sub-chambers until all chambers are minimum sized. This method results in mazes with long straight walls crossing their space, making it easier to see which areas to avoid.

Cellular Automata

A cellular automaton (pl. cellular automata, abbrev. CA) is a discrete model of computation studied in automata theory. Cellular automata are also called cellular spaces, tessellation automata, homogeneous structures, cellular structures, tessellation structures, and iterative arrays.[2] Cellular automata have found application in various areas, including physics, theoretical biology and microstructure modeling.

Roblox Scripting

Roblox Scripting (
On-line Documentation website


For the 2022 season, you will need to enroll your child onto the team through a web-based system.

Create an account at:

Robot JavaScript

2022 Challenge: Supercharged

2020 Challenge: RePlay

Web Tools

Computer Art

This is a program to teach the JavaScript computer programming language using Computer Art as the vehicle for the instruction. Students are taught basic programming skills in an easy to use development environment that shows the programs in action in real time.

JavaScript Sample Code

3-Button Menu

while(true) {
  drawText(15,30,'Press a key to')
  drawText(15,45,'  select a program')
  switch(keyPressed) {
  case 1:
    alert('You selected UP')
  case 2:
    alert('You selected ENTER')
  case 3:
    alert('You selected DOWN')

Robot Simulator

This is a program to teach the robot computer programming language used for moving the robot. This simulator does not emphasize programming. Instead, it tries to teach strategies for getting the robot to accomplish goals and missions.

RobotC Simulator

This is a program to teach the RobotC computer programming language.

Programming Exercises for RobotC

Joystick Programming (exercise-joystick-programming.htm)
This is an exercise in programming the joystick used in the May Madness competition.

Line Following Exercise (exercise-in-line-following.htm)
This is an exercise in Line Following with many examples of robotC code.

Function Overloading Exercise (exercise-in-function-overloading.htm)
This is an exercise in Function Overloading and Multi Threaded programming with many examples of robotC code.

Our season will focus on robots that talk -- about trash. We will have talking robots.

Text to Speech

Data Mining

FLL Theme for this year: Trash