Selis / digital-drinklist

Digital Drinklist

Hardware

Components

• Arduino Nano
• Micro SD Card reader
• 4GB Micro SD card
• RFID-RC522
• 3x Indicator LED's (Red, Green, Blue)
• 3x 330 ohm resistors
• 1x 220 ohm resistor

Software

Arduino

Arduino C++ code that listens for RFID cards and checks their ID against the database of users on the SD card. When a registered user scans their card enter their name in the DRINKS.TXT document on the SD Card.

Java

Java program with a GUI to use the DRINKS.TXT file to generate a summary of all the logged drinks and present them in a readable way.

SD Card File structure

The SD Card contains two important files, DRINKS.TXT and USERS.TXT.

USERS.TXT contains all the registered users that are able to use the digital drinklist, each user is represented by their own line in the USERS.TXT file, formatted as {userId}:{userName}. Example: 12345:Holger

DRINKS.TXT contains all the logged drinks where each drink registered is represented by a line in the file. Formatted as {userName}. Example of a DRINKS.TXT file where Holger has registered two drinks and Keso one:

Holger
Holger
Keso

Board pinout

Arduino PINS used

Arduino PIN	Component	SD Reader PIN	RFID PIN	LED
D2	330 ohm			GREEN_LED
D3	330 ohm			RED_LED
D4		CS
D5	330 ohm			BLUE_LED
D8			SDA
D9			RST
D11		MOSI	MOSI
D12	220 ohm	MISO
D12			MISO
D13		SCK	SCK
GND		GND	GND
3.3V			3.3V
5V		VCC

LED's

• GREEN_LED: PIN D2 -> 330 ohm resistor -> long leg -> short leg -> ground
• RED_LED: PIN D3 -> 330 ohm resistor -> long leg -> short leg -> ground
• BLUE_LED: PIN D5 -> 330 ohm resistor -> long leg -> short leg -> ground

SD Card Reader

SD Reader PIN	Component	Arduino PIN
GND		GND
VCC		5V
MISO	220 ohm	D12
MOSI		D11
SCK		D13
CS		D4

RFID Reader

RFID PIN	Arduino PIN
SDA	D8
SCK	D13
MOSI	D11
MISO	D12
IRQ
GND	GND
RST	D9
3.3V	3.3V