 Ahmed Khawaja: Microcontroller  Jonathan Limpalair: Construction  Bryan Mason: Microcontroller  Jesse Mccall: Editor, UI  David Pesa: Construction  Eric Stockton: Team Captain, UI

 Our goal was to make a reprogrammable Turing machine.  The physical machine is made entirely of Lego parts.  The Lego microcontroller is programmed in C like language.  The GUI is programmed in Java.

 The machine interfaces with the tape based on a program specified by an end-user.  The machine has an instruction set including jump, move, and write.  The machine uses a 32 bit reel of tape.  The user interface displays output that explains the binary on the tape.

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 BricxCC used to program the controller for the LEGO motors ◦ No need for Arduino, we have a powerful tool at our disposal already ◦ Simpler and well-documented examples  nXc – Not eXactly C ◦ More control over the machine  Access of encoders, byte-flag options for sensors ◦ Tasks  “Threaded” programs ◦ Functions  Normal C-like functions

 Initially test components individually ◦ Hardware  Move tape, flip bits, read bits  Testing while building allows a quick modification of hardware configuration to achieve desired results ◦ GUI  Accept user input, modify existing input, export input  Easier to determine which component contributes to failure  After both hit acceptable levels, start testing combination of GUI and Hardware  What our machine is designed to do

 We used the Mindstorms NXT 2.0 set (#8547).  We also ordered spare parts from both the Mindstorms NXT 2.0 set and crane set.  The Intelligent Brick, motors, and sensors from the Mindstorms NXT 2.0 set are all that operate the motor functions of the machine.

 The physical machine consists of a base and the strip of tape.  The bit flipping arm, the motor that moves the tape, and the sensor are on the base.  The Tape is a 32 bit long connected piece that floats along the base and is driven by the motors.

 Color sensor used to read in the value of a bit (Zero or One position)  One of the more complex parts of the project  Values read in by the sensor are affected by the ambient light in the room  We use a calibration and voting algorithm to get accurate readings from the sensor.

 The predicate: (buttonClicked || (ctrlKey && shiftKey && qKey));  This predicate acts as a contingency plan for the Turing machine. If preferred, the user can use keyboard commands to exit the program.

Path # buttonCli cked ctrlKeyshiftKeyqKeyTrue 1T---Yes 2FF--No 3FTTTYes 4FTF-No 5FTTF 6FTTTYes

ParameterValue WorkstationMac Dell Vostro Personal Build Dell Laptop Screen Size15"18"22" GUI Size (In Dimension/Java) 30x 50 50x5060x40 Bit Flip Speed (Motor %) 30%60%100% Tape Movement Speed (Motor %) 30%60%100%

Run No WorkStation Screen Size GUIBFSTMS Pass/ Fail 1Mac15"30x5030% 2Mac18"50x5060% F 3Mac22"60x40100% F 4Mac15"30x5030% 5Dell Vostro15"50x50100%30%F 6Dell Vostro18"30x5030%100% 7Dell Vostro22"30x5030%60% 8Dell Vostro15"60x4060%30%F 9Personal Build15"60x4030%60%F 10Personal Build18"30x50100%30% 11Personal Build22"30x5060%30% 12Personal Build15"50x5030%100%F 13Dell Laptop15"30x5060%100% 14Dell Laptop18"60x4030% F 15Dell Laptop22"50x5030% F 16Dell Laptop15"30x50100%60%

 Tested: ◦ 10 Entry Maximum ◦ 20 Entry Maximum ◦ 50 Entry Maximum  Process: ◦ Changed array size accordingly.  Result: ◦ All results gave the desired output.  Input was given up to the maximum limit and no more was allowed.

 Tested: ◦ Actual sending of the instructions to a file.  Process: ◦ Entered Commands and verified their transmission to the file.  Result: ◦ After a few problems with the controller and IO, we were able to achieve successful transmission.

 Tested: ◦ The cursor’s accuracy on the Scrolling Screen.  Process: ◦ Entered commands and verified their transmission. ◦ Checked the current command being changed with the cursor’s position on the Scrolling Screen.  Results: ◦ After making changes to the Scrolling screen’s interaction with the controller, we achieved the desired result.

 2 Parts Tested: ◦ Clearing on the screen ◦ Clearing in the document.  Process: ◦ Entered commands and verified their transmission. ◦ Issued the “Clear” command.  Results: ◦ After reconfiguring the controller interface and the IO interface we achieved the desired results.

 Student (Samuel Jackson – age 13): Samuel represents the common student  Professor (Dr. Hawking – age 45): Dr. Hawking is demonstrating the Turing machine  Breaker (Attila Dada – age 14): Attila loves to break things and will to cause glitches  Tinkerer (Albert Newton - age 12): Albert will tinker and play around with the machine

 Actor: Student, Samuel Jackson  Preconditions: The specific bit is a 0  Steps: The user enters the read bit command on the GUI.  The user sends the command to the microcontroller on the Turing Machine.  The microcontroller signals the sensor to read the bit.  Postconditions: The bit is read as a 0.  Alternative Scenarios: ◦ Scenario One: The bit is incorrectly read as a 1.

ES

 As of now we have successfully built the entire machine and have functionality on it.  We have completed the GUI and are finalizing the coding for the actual machine to work behind the scenes.  In the next few weeks all we will be doing is testing all of our test cases and making the tweaks we need to get a final product done by the end of the semester.