Circuit Documentation

Summary of the Circuit

This circuit is designed around the Arduino UNO microcontroller, which serves as the central processing unit. The circuit includes an RFID-RC522 module for RFID communication, a set of LEDs (green, red, and yellow) for visual indication, a buzzer for audio signaling, and an I2C LCD 16x2 Screen for displaying information. The Arduino UNO is responsible for controlling the peripherals and managing the data flow between the components.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

RFID-RC522

• An RFID reader/writer module
• Operates at 13.56 MHz and supports the MIFARE protocol.

LED: Two Pin (green)

• A basic green LED for visual indication
• Has an anode and a cathode pin.

LED: Two Pin (red)

• A basic red LED for visual indication
• Has an anode and a cathode pin.

LED: Two Pin (yellow)

• A basic yellow LED for visual indication
• Has an anode and a cathode pin.

Buzzer

• An audio signaling device
• Has a signal input pin and a ground pin.

I2C LCD 16x2 Screen

• A 16x2 character LCD display
• Supports I2C communication for displaying text.

Wiring Details

Arduino UNO

• 3.3V connected to RFID-RC522 VCC (3.3V)
• 5V connected to I2C LCD 16x2 Screen VCC (5V)
• GND connected to the ground pins of all components
• A4 (SDA) connected to I2C LCD 16x2 Screen SDA
• A5 (SCL) connected to I2C LCD 16x2 Screen SCL
• D2 connected to the anode of the green LED
• D3 connected to the anode of the yellow LED
• D4 connected to the anode of the red LED
• D5 connected to the buzzer PIN
• D9 connected to RFID-RC522 RST
• D10 connected to RFID-RC522 SDA
• D11 connected to RFID-RC522 MOSI
• D12 connected to RFID-RC522 MISO
• D13 connected to RFID-RC522 SCK

RFID-RC522

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

LEDs (green, red, yellow)

• cathode of each LED connected to common ground
• anode of green LED connected to Arduino UNO D2
• anode of yellow LED connected to Arduino UNO D3
• anode of red LED connected to Arduino UNO D4

Buzzer

• PIN connected to Arduino UNO D5
• GND connected to common ground

I2C LCD 16x2 Screen

• SDA connected to Arduino UNO A4 (SDA)
• SCL connected to Arduino UNO A5 (SCL)
• VCC (5V) connected to Arduino UNO 5V
• GND connected to common ground

Documented Code

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:

}

Additional Notes (documentation.txt)

No additional documentation provided for the code.