The Tool Control system is built around an Arduino Uno. The LCD Display requires four GND connections, plus two 5V connections, plus the 5V and GND connections for the two buttons, so terminal blocks are used to connect multiple wires to these pins.

Components

• Arduino Uno
• Ethernet Shield
• 16x2 LCD Screen
• MFRC522 RFID Reader
• 2 x Momentary Push Buttons
• Relay
• 1 x 8mm M3 Female-Female Hex Standoffs
• 2 x Terminal Strip Terminals (or 2 x 5-way Wago)
• 7 x Male-Female Jumper Wires
• 2 x Male-Bare Jumper Wires (Can use Male-Any Jumpers and cut off the non male end depending on what you have available)
• 6 x Female-Bare Jumper Wires (same as above)
• 6 x Male-Female Jumper Wires
• Junction Box Style Enclosure (To be replace with 3D Printed Enclosure in Version 2)

Pin Mapping

Arduino

Arduino Pin	Destination	Use
A0	LCD D4 Pin	Data pin for LCD Display
A1	LCD D5 Pin	Data pin for LCD Display
A2	LCD D6 Pin	Data pin for LCD Display
A3	LCD D7 Pin	Data pin for LCD Display
2	LCD RS Pin	Register Select pin for LCD Display
3	LCD E Pin	Enable pin for LCD Display
5	RFID SDA Pin	Slave Select for RFID SPI
6	Induct Button	Input for Induct Button
7	Sign Out Button	Induct for Sign Out Button
9	RFID RST Pin	Reset pin for RFID
11	RFID SCK Pin	SCK pin for RFID SPI
12	RFID MOSI Pin	MOSI pin for RFID SPI
13	RFID MISO Pin	MISO pin for RFID SPI
GND (next to 13)	RFID GND Pin	Ground pin for RFID
3.3V	RFID 3.3V Pin	Power pin for RFID
GND (next to power pins)	Terminal Block	Ground ref for LCD
5V	Terminal Block	5V ref for LCD

RFID

LCD

LCD Pin	Destination	Use
VSS	Ground Terminal Block	Ground
VDD	+5V Terminal Block	Power
V0	Ground Terminal Block	Contrast
RS	Arduino Pin 2	Register Select
R/W	Ground Terminal Block	Read/Write Signal
E	Arduino Pin 3	Enable Signal
DB4	Arduino Pin A0	Data Pin
DB5	Arduino Pin A1	Data Pin
DB6	Arduino Pin A2	Data Pin
DB7	Arduino Pin A3	Data Pin
A	+5V Terminal Block	Backlight Power
K	Ground Terminal Block	Backlight Ground

How it works

TBC