Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with an LCD screen (16x2 I2C) and an RFID-RC522 module. The Arduino UNO serves as the central controller, providing power and communication to the peripheral devices. The LCD screen is used for displaying information, while the RFID-RC522 module is used for reading RFID tags.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

LCD screen 16x2 I2C

• Description: A 16x2 character LCD display with I2C interface.
• Pins: SCL, SDA, VCC, GND

RFID-RC522

• Description: A low-cost RFID module that uses the MFRC522 IC.
• Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

Wiring Details

Arduino UNO

• 3.3V: Connected to RFID-RC522 VCC (3.3V)
• 5V: Connected to LCD screen 16x2 I2C VCC
• GND: Connected to LCD screen 16x2 I2C GND and RFID-RC522 GND
• A4: Connected to LCD screen 16x2 I2C SDA
• A5: Connected to LCD screen 16x2 I2C SCL
• D13: Connected to RFID-RC522 SCK
• D12: Connected to RFID-RC522 MISO
• D11: Connected to RFID-RC522 MOSI
• D10: Connected to RFID-RC522 SDA
• D9: Connected to RFID-RC522 RST

LCD screen 16x2 I2C

• VCC: Connected to Arduino UNO 5V
• GND: Connected to Arduino UNO GND
• SDA: Connected to Arduino UNO A4
• SCL: Connected to Arduino UNO A5

RFID-RC522

• VCC (3.3V): Connected to Arduino UNO 3.3V
• GND: Connected to Arduino UNO GND
• SCK: Connected to Arduino UNO D13
• MISO: Connected to Arduino UNO D12
• MOSI: Connected to Arduino UNO D11
• SDA: Connected to Arduino UNO D10
• RST: Connected to Arduino UNO D9

Code Documentation

Arduino UNO Code

sketch.ino

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

documentation.txt