Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates an Arduino UNO microcontroller, an RFID-RC522 module, and an HC-05 Bluetooth module. The circuit is designed to interface these components for various applications, such as RFID-based access control and wireless communication via Bluetooth.

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

RFID-RC522

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

HC-05 Bluetooth Module

• Description: A Bluetooth module for wireless communication.
• Pins: Key, VCC, TXD, RXD, State, GND

Wiring Details

Arduino UNO

• 3.3V: Connected to VCC (3.3V) of RFID-RC522
• 5V: Connected to VCC of HC-05 Bluetooth Module
• GND: Connected to GND of RFID-RC522 and HC-05 Bluetooth Module
• D13: Connected to SCK of RFID-RC522
• D12: Connected to MISO of RFID-RC522
• D11: Connected to MOSI of RFID-RC522
• D10: Connected to SDA of RFID-RC522
• D9: Connected to RST of RFID-RC522
• D4: Connected to RXD of HC-05 Bluetooth Module
• D3: Connected to TXD of HC-05 Bluetooth Module

RFID-RC522

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

HC-05 Bluetooth Module

• VCC: Connected to 5V of Arduino UNO
• GND: Connected to GND of Arduino UNO
• RXD: Connected to D4 of Arduino UNO
• TXD: Connected to D3 of Arduino UNO

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 Documentation (documentation.txt)

This document provides a comprehensive overview of the circuit, including the components used, their wiring details, and the code for the Arduino UNO microcontroller.