Twitch Plays ECE477ECE 477 Design Review Team 1 − Spring 2015

Hannan Harlan Root Tornquist

Outline• Project overview • Project-specific success criteria• Block diagram• Component selection rationale• Packaging design• Schematic and theory of operation• PCB layout• Software design/development status• Project completion timeline• Questions / discussion

Project OverviewTwitch Plays ECE477 is a Collaborative

Robotics Project

Twitch Plays

ECE477

Team 1

Team 2

Project Specific Success Criteria1. An ability to receive video from a camera via UART and transmit data via

WiFi to a PC.

2. An ability for a robot to receive and decode commands from a webserver over WiFi.

3. An ability for the microcontroller to direct motor speed and direction based on a desired movement operation (forward, backwards, rotate, kick).

4. An ability for a webserver to receive commands from users on the internet, enqueue the commands, and send them to the robots at a human playable rate. (Low delay between commands, but enough time for human to respond).

5. An ability to track the game score via sensors on goals and display the score both on the field of play and on the video feeds. (Note: This will be done via a raspberry PI).

Block DiagramVideo

Subsystem

Goal Sensors

Router Webserver

WiFiModule

Camera Module

Motor Controller

Score Display

Mechanical Design

Component Selection Rationale● Microcontroller● Motors● Camera● WiFi● Power

Component: Microcontroller

Requirements:● Memory for JPEG Frame (~1.14 MB 640*480)● 2 UART (Camera and WiFi)● 3 PWM● 2 GPIO (Motor Direction)

PIC32MZ2048ECM064 meets these requirements

Component: Motors

Stepper● Harder to Control● More Costly● High Precision

Brushed DC● Easy to Control● Cheap● Low Precision

Component: Camera

Omnivision OV9715● SCCB Interface● 10-bit RAW RGB

uCAM II● UART Interface● JPEG Images● 3.3v Logic

Component: WiFi

RN171● Integrated TCP/IP● Packaged Solution● ASCII Input● UART

MRF24WG0MA● Off Chip Stack● High Control● SPI

Component: Power

Tether● Limited

Motion● Constant

Power

Battery● Full

Motion● Limited

Power

Bumper-Car Style● Full

Motion● Constant

Power

Packaging Design - Field

Playing Field / Enclosure - 48” x 48” x 12”

Packaging Design - Robot

Isometric View Back View Chassis

Software Components

CommunicationMap

Embedded Operations

Initialize Camera Logic

Command Logic

Embedded Operations

Command System Response

System

IRC Bot

Redis Server (Resque Queue)

Command System

Video FeedGenerate Image Feed

Broadcast Twitch Data

Video Feed

Scoring System

Raspberry Pi PC

Scoring System

PCB

Initial PCB Layout

PCB Layout v1.0

PCB Layout v2.0

Layout Comparison

Project Status

Software Development Status

Webcam Control

WiFi Control

Webcam to WiFi

Request Command

Execute Command

IRC Bot

Command Queue

Receive Image

Send Command

Frontend for

Stream

Webcam Server

Score Display

Score Change

Score Tracking

Score Trigger

Microcontroller Webserver Raspberry Pi

Not Started

In Progress

Complete

Project Completion Timeline

Weekly Goals:Week 9: Pic32 WiFi and camera logicWeek 11: Complete Software InteractionsWeek 12: Build Robot and FieldWeek 13: Testing/Turn in Early

Week 14: Testing/Turn in EarlyWeek 15: Testing/Turn in EarlyWeek 16: Showcase

Questions?