Difference between revisions of "F18: Goals of Glory"

Revision as of 08:50, 16 December 2018

Project Title

Goals of Glory

Abstract

Gesture-based gaming is getting tremendous adoption due to immersive gameplay and increased player engagement. Goals of Glory is a classic penalty shootout game where 2 players can play wirelessly, and the corresponding game visuals are displayed on the LED Matrix in real time. The logic for player movement is based on the output from a Gyroscope and an Accelerometer embedded on MPU 6050 whereas accelerometer on the SJone helps drive goalkeeper movements. Thus the motion of player leg movements to kick and hand movements of the goalkeeper to stop the ball is mapped and the corresponding game animations are displayed on 64x64 LED Matrix. The LED matrix is interfaced to the SJone board in such a way that the main SJone board controlling the LED Matrix receives commands wirelessly from hand and leg movements of each player via the Nordic wireless mesh network. Three display screens are developed for the game UI- Start screen, Game screen, and Result screen. Thus, by playing Goals of Glory, players can experience gesture-based gaming capabilities.

Objectives & Introduction

Introduction

The project is divided into 3 modules

1) LED Module: The 64x64 LED matrix is driven by a Master SJone board which is responsible to map game visuals.

2) Wireless Module: Responsible for communication medium between the goalkeeper, player, and main SJone board

3) Accelerometer Module: This module is responsible for getting the player and goalkeeper movement that will later be mapped to drive game visuals

Game Stats:

• 2-Player Penalty shootout Game
• 3-sec timer for each player to shoot
• Press switch on the main SJOne board to start
• Move the Goalkeeper SJone board left-right to have a corresponding movement of LED Matrix
• Control the ball movement via player SJone board to give direction i.e. left, right or straight
• Highest player to score wins and is displayed on the result screen

Objectives

Our project involved a focused and rigorous approach to testing each module functionality and make necessary changes thereafter.

• Design power management PCB
• Developing game visuals for the penalty shootout game.
• Developing logic for display tasks such as curving the ball, selecting the player and ball color.
• Implement RGB LED matrix driver
• Perform RGB LED matrix pin layout with the SJone board and have a deep understanding of how a single or group of LED's are driven.
• Perform accelerometer driver
• Perform nordic wireless driver
• Have a proper synchronization between the player SJone board and goalkeeper SJone board
• Examine overall system and make necessary tweaks
• Prepare the entire system for demo purpose which includes gloves and mounting pads to mount hardware equipment

Team Members & Responsibilities

• Player Movements
  • Aniket Phatak
  • Bhargav Shashidhara Pandit

• Goalkeeper Movements
  • Tahir Rawn
  • Harmeen Joshi

• Display (RGB LED Matrix)
  • Harmeen Joshi
  • Tahir Rawn
  • Satya Sai Deepak. Naidu

• Wireless (Nordic)
  • Aniket Phatak
  • Bhargav Shashidhara Pandit

• PCB Design
  • Satya Sai Deepak. Naidu

Schedule

Parts List & Cost

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

Nordic Wireless

Printed Circuit Board (PCB) Design

Introduction: The game uses a 64x64 LED Matrix which needs a 5v input supply. Since the board supplies 3.3v we level shift the voltage to 5v to avoid any unwanted flickering. So, we have decided to design a level shifter circuit. The design starts with the schematics and then designing the foot print. The design ends with creating the Gerber files and sending them to the manufacturing unit.

Schematics: The design was made in Eagle PCB design software. In preparing your schematics we encountered few challenges with selection of equipment dimensions and dimension terminology(units). The designer should be aware of the dimensions of equipment that are to be used. After getting the idea of equipment add the library of that equipment to eagle through manage library option. Now, the designer can get that item schematic and add it to the design schematics. Complete the schematics based on the circuit that the designer wants to implement. Figure.1 shows the schematics for level shifter circuit.

Schematics for the circuit

Few tips for schematics: • Make sure the dimensions of auxiliary equipment size match the equipment. For example, the supply port size is 4mm pitch 4 pins if I use 2mm pitch 4pins my circuit is practically cannot be implemented. • Have a clear idea of the equipment and their availability in the market before getting started. Sometimes your design may be correct, but you will not be getting appropriate equipment for installing on circuit board. • Use Vcc and Gnd pins for reducing circuiting complexity.

Foot Print

Final Board

Foot Print and Gerber Files:

After the schematics are done, you can see a (_BRD^SCH) button i.e. schematic to board button. Using that button, the footprint page will be opened. Here you will be able to use some skills in designing a compact circuit. Selecting the

trace width (in mils) accordingly based on your current ratings. We used a 2 layered 16 mils trace width for safer side to accommodate 4A flow of current. Place all your equipment in the square (board area) and can have positioned them upon the designers will. Click on auto net list button to run the simulations for possible tracing options

The designer can select one or draw the traces manually( manual is mostly preferred for better results).The foot print of out circuit is shown in Figure.2. Now, continue with DRC(design real check ) to check the possible errors while manufacturing. Make sure that there are no errors. After all the errors are cleared create the Gerber files for manufacturing company to provide those files to the manufacturing machines.

Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Issues and Challenges

1. Dimensions of power pins

Since there is no datasheet available for the 64x64 RGB LED Matrix, hence it was a difficult task to accommodate the exact dimensions on the PCB design.

2. Designing the RGB LED Matrix Display driver

• Writing the driver function on our own was a challenge. We were able to easily glow a single row in the matrix. However, the challenge lied in glowing a single pixel value at a specified location. And lack of datasheet made it even more difficult. Once we got the control over glowing a single LED (check updateDisplay function as shown above), we were able to implement various functions to draw lines, squares, triangles, car, digits, text.

3. Matrix flickering Issue

The application has a task to call updateDisplay() function to update the buffer every 1ms. This task had a lower priority as compared to the player transaction task in the Master module. As a result of this, the LED Display Matrix was being updated at a slower rate, and thus, leading to matrix flickering. The issue was resolved by changing the priority of the updateDisplay matrix task higher than the Player task.

4. Wireless Packet drop

The Player module was waiting for acknowledgment from the master module which delayed the sending of the orientation data. Since, the player must keep on continuously send the orientation data irrespective of the acknowledgment received from the Master board, the logic to wait for acknowledgment was removed and packet drop reduced significantly. This led to the smooth movement of the car on the display as Master started receiving continuous data from the Player module.

5. Wireless noise interference

We tried different channels from 2400-2499 and picked the channel number 2499 as it was giving the least noise interference in the communication between our Player boards and the Master board.

Testing

1. Calling display API functions in tasks as opposed to calling in main

Various functions were written in Display Matrix module and tested. This functions can be directly called in main and checked on the display. However, to avoid issues during integration with the master, which ran multiple tasks by checking the logic, the display matrix functions were called by running multiple tasks in Display Matrix module and tested there itself. After which they were integrated with Master module. So, if multiple tasks calling these functions had issues, then it could be resolved right away before integrating with the Master module.

1. Feature by Feature testing

We tested the application as soon as we completed one feature. As soon as a function was written bY Display Matrix members, it was tested on the display. Further, it was integrated with the Master module tasks and tested. This helped a lot in debugging the issues while integrating.

Conclusion

Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?

Project Video

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Project Source Code

• Sourceforge Source Code Link

References

Acknowledgement

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References Used

List any references used in project.

Appendix

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