1. <Add team picture or relevant project picture here>
ECE 477 FINAL REVIEW: TEAM 4

2. OUTLINE Project Overview Block Diagram Design Challenges
Individual Contributions
Project Demonstration
Q & A

3. PROJECT OVERVIEW
Ultimate vending machine implementing with new payment system
Provides two methods to pick up merchandise.
Order and pay for items through an Android app.
QR code and receipt code will be generated on Android app.
Scan the QR code or enter the receipt code to pick up item.
A mechanism can detect failure of dropping item.

4. BLOCK DIAGRAM

5. DESIGN CHALLENGES PCB design Transmission Protocols
UART – Microcontroller to Raspberry Pi
Raspberry Pi
Google cloud message usage
Camera libraries installation
Raspberry Pi Wi-Fi connection
Android application
Information auto update
QR code generation and recognition

6. INDIVIDUAL CONTRIBUTIONS
Team member position
Team Leader - Ruotong Ji
Hardware engineer - Yaqin Huang
System engineer - Renjun Zheng
Software engineer - Xingyu Zhou

7. INDIVIDUAL CONTRIBUTIONS
Ruotong Ji
PCB Design
Schematic and trace routing of PCB
PCB troubleshooting
Microcontroller
Whole microcontroller algorithm design and framework setup
Microcontroller programming including ATD, SPI, UART
Test UART send and receive data with RPi
Packaging
Prepared the materials for vending machine
Aided in assembling the box
Packaging troubleshooting

8. INDIVIDUAL CONTRIBUTIONS
Yaqin Huang
PCB design
Designed the circuits for LCD screen, force sensor, Keypad, motor driver and motor
Checked the design of PCB
Soldered the PCB
Microcontroller
Programed code for motor and motor driver part with PWM
Packaging
Prepared the materials for vending machine
Aided in assembling the case
Packing troubleshooting

9. INDIVIDUAL CONTRIBUTIONS
Xingyu Zhou
Raspberry Pi
Configure pins to send data to microcontroller
Test UART send and receive data with microcontroller
Associate Renjun with RPi
Database
Create the database and design the layout of the database
Server
Write functions to interact with the database
Packaging
Aided in designing the layout
Aided in assembling the box

10. INDIVIDUAL CONTRIBUTIONS
Renjun Zheng
Android App
Design and created user interface.
Integrated QR code generation with ordering system.
Implemented item quantity and purchase history auto update.
Server
Realized communication between server and Android app.
Utilized Raspberry Pi camera module for QR code recognition.
Database
Refactored some server and database communication code.
Packaging
Drafted and drawn vending machine structure.
Prepared and assembled part of the machine.

11. PROJECT DEMONSTRATION
An ability to generate a unique encrypted receipt code when users order on the phone using the mobile app.
An ability to accept receipt code using keypad input on the machine.
An ability to select correct item and push the item to the output port by rotating spring.
An ability to use weight sensor to detect item dropped.
An ability to transmit receipt code between microcontroller and Raspberry Pi

12. Questions?