Circuit Documentation

Summary

This circuit is designed to control access using an RFID reader, a fingerprint scanner, and a WiFi module for remote logging. The system uses an Arduino Mega 2560 as the main microcontroller. It includes various components such as LEDs, a buzzer, a relay, a solenoid lock, and an LCD display to provide user feedback and control mechanisms.

Component List

1. Arduino Mega 2560

   • Description: Main microcontroller used to control the entire system.
   • Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL

2. RFID-RC522

   • Description: RFID reader used to read RFID cards.
   • Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

3. Fingerprint Scanner

   • Description: Used to scan and verify fingerprints.
   • Pins: VCC, TX, RX, GND

4. WiFi module ESP8266-01

   • Description: WiFi module used for remote logging and communication.
   • Pins: RX, GPIO0, GPIO2, GND, +3V3, Reset, CH-PD Chip power down, TX

5. LED: Two Pin (green)

   • Description: Green LED used for visual feedback.
   • Pins: cathode, anode

6. Buzzer

   • Description: Buzzer used for audio feedback.
   • Pins: PIN, GND

7. LED: Two Pin (yellow)

   • Description: Yellow LED used for visual feedback.
   • Pins: cathode, anode

8. 1-Channel Relay (5V 10A)

   • Description: Relay used to control the solenoid lock.
   • Pins: NC, signal, C, power, NO, ground

9. Tactile Switch Buttons - 12mm Square

   • Description: Push button used for manual control.
   • Pins: 3, 1, 4, 2

10. 12V Solenoid Lock

    • Description: Solenoid lock used to lock/unlock the door.
    • Pins: VCC, GND

11. Resistor (200 Ohms)

    • Description: Resistor used in the circuit.
    • Pins: pin1, pin2

12. LED: Two Pin (red)

    • Description: Red LED used for visual feedback.
    • Pins: cathode, anode

13. 16x2 I2C LCD

    • Description: LCD display used to provide visual feedback.
    • Pins: GND, VCC, SDA, SCL

14. Resistor (220 Ohms)

    • Description: Resistor used in the circuit.
    • Pins: pin1, pin2

15. Resistor (330 Ohms)

    • Description: Resistor used in the circuit.
    • Pins: pin1, pin2

16. Resistor (1000 Ohms)

    • Description: Resistor used in the circuit.
    • Pins: pin1, pin2

17. Resistor (10000 Ohms)

    • Description: Resistor used in the circuit.
    • Pins: pin1, pin2

Wiring Details

Arduino Mega 2560

• 5V: Connected to VCC of 12V solenoid lock, power pin of 1-Channel Relay, +3V3 of WiFi module ESP8266-01, VCC of 16x2 I2C LCD, VCC (3.3V) of RFID-RC522, VCC of Fingerprint Scanner
• GND: Connected to pin1 of multiple resistors, GND of 12V solenoid lock, GND of WiFi module ESP8266-01, GND of 16x2 I2C LCD, GND of RFID-RC522, GND of Fingerprint Scanner, ground of 1-Channel Relay
• RESET: Connected to Reset of WiFi module ESP8266-01
• D5 PWM: Connected to RST of RFID-RC522
• D6 PWM: Connected to pin1 of 10000 Ohms resistor, pin1 of Tactile Switch Buttons
• D7 PWM: Connected to signal of 1-Channel Relay
• D8 PWM: Connected to anode of yellow LED
• D9 PWM: Connected to anode of red LED
• D10 PWM: Connected to anode of green LED
• D11 PWM: Connected to PIN of buzzer
• D16 PWM/TX2: Connected to TX of WiFi module ESP8266-01
• D17 PWM/RX2: Connected to RX of WiFi module ESP8266-01
• D18/TX1: Connected to TX of Fingerprint Scanner
• D19/RX1: Connected to RX of Fingerprint Scanner
• D20/SDA: Connected to SDA of 16x2 I2C LCD
• D21/SCL: Connected to SCL of 16x2 I2C LCD
• D50: Connected to MISO of RFID-RC522
• D51: Connected to MOSI of RFID-RC522
• D52: Connected to SCK of RFID-RC522
• D53: Connected to SDA of RFID-RC522

RFID-RC522

• VCC (3.3V): Connected to 5V of Arduino Mega 2560
• RST: Connected to D5 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• MISO: Connected to D50 of Arduino Mega 2560
• MOSI: Connected to D51 of Arduino Mega 2560
• SCK: Connected to D52 of Arduino Mega 2560
• SDA: Connected to D53 of Arduino Mega 2560

Fingerprint Scanner

• VCC: Connected to 5V of Arduino Mega 2560
• TX: Connected to D18/TX1 of Arduino Mega 2560
• RX: Connected to D19/RX1 of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560

WiFi module ESP8266-01

• RX: Connected to D17 PWM/RX2 of Arduino Mega 2560
• TX: Connected to D16 PWM/TX2 of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• +3V3: Connected to 5V of Arduino Mega 2560
• Reset: Connected to RESET of Arduino Mega 2560

LED: Two Pin (green)

• anode: Connected to D10 PWM of Arduino Mega 2560
• cathode: Connected to pin2 of 330 Ohms resistor

Buzzer

• PIN: Connected to D11 PWM of Arduino Mega 2560
• GND: Connected to pin2 of 1000 Ohms resistor

LED: Two Pin (yellow)

• anode: Connected to D8 PWM of Arduino Mega 2560
• cathode: Connected to pin2 of 220 Ohms resistor

1-Channel Relay (5V 10A)

• signal: Connected to D7 PWM of Arduino Mega 2560
• power: Connected to 5V of Arduino Mega 2560
• ground: Connected to GND of Arduino Mega 2560

Tactile Switch Buttons - 12mm Square

• 1: Connected to pin1 of 10000 Ohms resistor
• 2: Connected to 5V of Arduino Mega 2560

12V Solenoid Lock

• VCC: Connected to 5V of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560

Resistor (200 Ohms)

• pin1: Connected to GND of Arduino Mega 2560

LED: Two Pin (red)

• anode: Connected to D9 PWM of Arduino Mega 2560
• cathode: Connected to pin2 of 220 Ohms resistor

16x2 I2C LCD

• VCC: Connected to 5V of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• SDA: Connected to D20/SDA of Arduino Mega 2560
• SCL: Connected to D21/SCL of Arduino Mega 2560

Resistor (220 Ohms)

• pin1: