QR-code Vending Machine

How to use

git clone https://github.com/VivianChan1998/QRcode-Vending-Machine.git
cd QRcode-Vending-Machine/
npm install
npm start

enter localhost:3000/ in browser

How it is written

Front end: React.js Back end: Express.js RPi and Arduino Code

How it works

1. By pressing order! button, front end sends a request to server, including a specified uuid and item ID.
2. Server saves the uuid in database, and generates a QRcode that includes the GET request(including the uuid in QRcode).
3. Server sends the QRcode to Front end.
4. User scans the QR-code at the machine.
5. The vending machine sends the url in the QRcode to the server.
6. Server compares what it reserved with the database, to assure the order exists.
7. Server tells the machine if the order exists or not, which item id it is, and dispense the item.

:)