Circuit Documentation

Summary

The circuit in question is designed to interface multiple peripheral devices with a microcontroller board. The peripherals include an RFID-RC522 module for RFID reading, a Fingerprint Scanner for biometric identification, an LCD 2X16 with I2C interface for display purposes, a touch sensor, a buzzer for audio feedback, and a Relay module for controlling high-power devices. The microcontroller board used in this circuit is a NANO Expansion board, which facilitates the connection and control of the various components.

Component List

RFID-RC522

• Description: RFID reader/writer module.
• Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA.

Fingerprint Scanner

• Description: Biometric fingerprint scanner.
• Pins: VCC, TX, RX, GND.

LCD 2X16 I2C

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

NANO Expansion Board

• Description: Microcontroller board with a variety of digital and analog pins.
• Pins: GND, ARF, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, R, TX, 5V, RX, SDA, 3V3, A7, A6, A4, A3, A2, A1, A0.

Touch Sensor

• Description: Capacitive touch sensor module.
• Pins: IO, VCC, GND.

Buzzer

• Description: Piezoelectric buzzer for audio signaling.
• Pins: PIN, GND.

Relay Module 1 Channel

• Description: Single-channel relay module for controlling high-power devices.
• Pins: S, 5V, GND, NC, COM, NO.

Wiring Details

RFID-RC522

• VCC (3.3V) connected to 3V3 on NANO Expansion Board.
• RST connected to pin 9 on NANO Expansion Board.
• GND connected to GND on NANO Expansion Board.
• MISO connected to pin 12 on NANO Expansion Board.
• MOSI connected to pin 11 on NANO Expansion Board.
• SCK connected to pin 13 on NANO Expansion Board.
• SDA connected to pin 10 on NANO Expansion Board.

Fingerprint Scanner

• VCC connected to 3V3 on NANO Expansion Board.
• TX connected to pin 2 on NANO Expansion Board.
• RX connected to pin 3 on NANO Expansion Board.
• GND connected to GND on NANO Expansion Board.

LCD 2X16 I2C

• GND connected to GND on NANO Expansion Board.
• VCC connected to 5V on NANO Expansion Board.
• SDA connected to A7 on NANO Expansion Board.
• SCL connected to A4 on NANO Expansion Board.

Touch Sensor

• IO connected to pin 4 on NANO Expansion Board.
• VCC connected to 5V on NANO Expansion Board.
• GND connected to GND on NANO Expansion Board.

Buzzer

• PIN connected to A3 on NANO Expansion Board.
• GND connected to GND on NANO Expansion Board.

Relay Module 1 Channel

• S connected to A2 on NANO Expansion Board.
• 5V connected to 5V on NANO Expansion Board.
• GND connected to GND on NANO Expansion Board.

Documented Code

Since no code was provided in the input, this section cannot be completed. Normally, this section would include the source code for the microcontroller, with comments explaining the functionality and the interactions with the connected components.