Circuit Documentation

Summary

This circuit is a comprehensive security system that integrates various components such as a Raspberry Pi 4B, ESP32-CAM, fingerprint scanner, membrane keypad, servo motor, relay module, LEDs, loudspeaker, condenser microphone, and a solenoid lock. The system is designed to provide multiple methods of authentication (keypad, fingerprint) and includes features like video streaming, image capture, and doorbell functionality.

Component List

1. Raspberry Pi 4B

   • Description: Main microcontroller for the system.
   • Pins: 3V3, 5V, GPIO2, GPIO3, GND, GPIO4, GPIO14, GPIO15, GPIO17, GPIO18, GPIO27, GPIO22, GPIO23, GPIO24, GPIO10, GPIO9, GPIO25, GPIO11, GPIO8, GPIO7, ID_SD, GPIO5, GPIO6, GPIO12, GPIO13, GPIO19, GPIO16, GPIO26, GPIO20, GPIO21, ID_SC, TR01_TAP, TR00_TAP, TR03_TAP, TR02_TAP, RUN, GLOBAL_EN

2. 4X4 Membrane Matrix Keypad

   • Description: Used for keypad-based authentication.
   • Pins: R1, R2, R3, R4, C1, C2, C3, C4

3. Servo

   • Description: Controls the locking mechanism.
   • Pins: gnd, vcc, pulse

4. 1 Channel 5V Relay Module

   • Description: Controls the solenoid lock.
   • Pins: VCC+, VCC- (GND), IN, N.O., COM, N.C.

5. 12V Power Supply

   • Description: Provides power to the circuit.
   • Pins: +, -

6. ESP32-CAM

   • Description: Used for video streaming and image capture.
   • Pins: 5V, GND, IO12, IO13, IO15, IO14, IO2, IO4, VOT, VOR, VCC, IO0, IO16, 3V3

7. Fingerprint Scanner

   • Description: Used for fingerprint-based authentication.
   • Pins: VCC, TX, RX, GND

8. LED: Two Pin (red)

   • Description: Indicates the status of the system.
   • Pins: cathode, anode

9. LED: Two Pin (green)

   • Description: Indicates the status of the system.
   • Pins: cathode, anode

10. Loudspeaker

    • Description: Provides audio feedback.
    • Pins: pin1, pin2

11. Condenser Microphone

    • Description: Captures audio.
    • Pins: pin1, pin2

12. 2Pin Push Switch

    • Description: Used as a doorbell.
    • Pins: Input +, Output +

13. 12V Solenoid Lock

    • Description: Controls the door locking mechanism.
    • Pins: VCC, GND

14. Buck Converter

    • Description: Converts 12V to 5V.
    • Pins: IN+, IN-, OUT+, OUT-

15. Micro USB to Cable (2 Pin)

    • Description: Provides power to the Raspberry Pi.
    • Pins: Micro USB, +, -

16. Resistor (150 Ohms)

    • Description: Current limiting resistor for LEDs.
    • Pins: pin1, pin2

Wiring Details

Raspberry Pi 4B

• 5V: Connected to 5V pin of ESP32-CAM, Servo (vcc), and Relay Module (VCC+).
• GND: Connected to GND pin of ESP32-CAM, Servo (gnd), Loudspeaker (pin1), Condenser Microphone (pin1), and Relay Module (VCC- (GND)).
• GPIO25: Connected to pin2 of Resistor (150 Ohms) which is connected to the anode of the red LED.
• GPIO8: Connected to pin2 of Resistor (150 Ohms) which is connected to the anode of the green LED.
• GPIO18: Connected to pulse pin of Servo.
• GPIO23: Connected to IN pin of Relay Module.
• GPIO24: Connected to IO0 pin of ESP32-CAM.
• GPIO10: Connected to Input + pin of 2Pin Push Switch.
• GPIO9: Connected to pin2 of Condenser Microphone.
• GPIO7: Connected to pin2 of Loudspeaker.
• GPIO5: Connected to R1 pin of 4X4 Membrane Matrix Keypad.
• GPIO6: Connected to R2 pin of 4X4 Membrane Matrix Keypad.
• GPIO12: Connected to C1 pin of 4X4 Membrane Matrix Keypad.
• GPIO13: Connected to R3 pin of 4X4 Membrane Matrix Keypad.
• GPIO19: Connected to R4 pin of 4X4 Membrane Matrix Keypad.
• GPIO16: Connected to C2 pin of 4X4 Membrane Matrix Keypad.
• GPIO20: Connected to C3 pin of 4X4 Membrane Matrix Keypad.
• GPIO21: Connected to C4 pin of 4X4 Membrane Matrix Keypad.

4X4 Membrane Matrix Keypad

• R1: Connected to GPIO5 of Raspberry Pi.
• R2: Connected to GPIO6 of Raspberry Pi.
• R3: Connected to GPIO13 of Raspberry Pi.
• R4: Connected to GPIO19 of Raspberry Pi.
• C1: Connected to GPIO12 of Raspberry Pi.
• C2: Connected to GPIO16 of Raspberry Pi.
• C3: Connected to GPIO20 of Raspberry Pi.
• C4: Connected to GPIO21 of Raspberry Pi.

Servo

• gnd: Connected to GND of Raspberry Pi.
• vcc: Connected to 5V of Raspberry Pi.
• pulse: Connected to GPIO18 of Raspberry Pi.

1 Channel 5V Relay Module

• VCC+: Connected to 5V of Raspberry Pi.
• VCC- (GND): Connected to GND of Raspberry Pi.
• IN: Connected to GPIO23 of Raspberry Pi.
• N.O.: Connected to VCC of 12V solenoid lock.
• COM: Connected to IN+ of Buck converter and + of 12V power supply.

12V Power Supply

• +: Connected to IN+ of Buck converter and COM of Relay Module.
• -: Connected to IN- of Buck converter and GND of 12V solenoid lock.

ESP32-CAM

• 5V: Connected to 5V of Raspberry Pi.
• GND: Connected to GND of Raspberry Pi.
• IO0: Connected to GPIO24 of Raspberry Pi.

Fingerprint Scanner

• GND: Connected to GND of Raspberry Pi.

LED: Two Pin (red)

• cathode: Connected to GND of Raspberry Pi.
• anode: Connected to pin1 of Resistor (150 Ohms).

LED: Two Pin (green)

• cathode: Connected to GND of Raspberry Pi.
• anode: Connected to pin1 of Resistor (150 Ohms).

Loudspeaker

• pin1: Connected to GND of Raspberry Pi.
• pin2: Connected to GPIO7 of Raspberry Pi.

Condenser Microphone

• pin1: Connected to GND of Raspberry Pi.
• pin2: Connected to GPIO9 of Raspberry Pi.

2Pin Push Switch

• Input +: Connected to GPIO10 of Raspberry Pi.
• Output +: Connected to GND of Raspberry Pi.

12V Solenoid Lock

• VCC: Connected to N.O. of Relay Module.
• GND: Connected to GND of 12V power supply.

Buck Converter

• IN+: Connected to + of 12V power supply.
• IN-: Connected to - of 12V power supply.
• OUT+: Connected to + of Micro USB to Cable.
• OUT-: Connected to - of Micro USB to Cable.

Micro USB to Cable (2 Pin)

• Micro USB: Connected to Raspberry Pi.
• +: Connected to OUT+ of Buck converter.
• -: Connected to OUT- of Buck converter.

Resistor (150 Ohms)

• pin1: Connected to anode of red LED.
• pin2: Connected to GPIO25 of Raspberry Pi.

Resistor (150 Ohms)

• pin1: Connected to anode of green LED.
• pin2: Connected to GPIO8 of Raspberry Pi.

Code Documentation

import RPi.GPIO as GPIO
import time
from pyfingerprint.pyfingerprint import PyFingerprint
from picamera import PiCamera
import os
import serial

# GPIO setup