Circuit Documentation

Summary

This circuit integrates an Arduino UNO microcontroller with various components including a 4x4 Membrane Matrix Keypad, a 12V Blue LED, a 12V solenoid lock, a Fingerprint Scanner, a buzzer, a 5V relay, and an ESP32-CAM. The circuit is powered by a 12V power supply and is designed to control a solenoid lock based on inputs from the keypad and fingerprint scanner, with visual and auditory feedback provided by the LED and buzzer.

Component List

1. 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

2. 4X4 Membrane Matrix Keypad

   • Description: A keypad with 16 buttons arranged in a 4x4 matrix.
   • Pins: R1, R2, R3, R4, C1, C2, C3, C4

3. 12V Blue LED

   • Description: A blue LED that operates at 12V.
   • Pins: GND, VCC

4. 12V Power Supply

   • Description: A power supply that provides 12V DC.
   • Pins: +, -

5. 12V Solenoid Lock

   • Description: An electromechanical lock that operates at 12V.
   • Pins: VCC, GND

6. Fingerprint Scanner

   • Description: A biometric sensor for fingerprint recognition.
   • Pins: VCC, TX, RX, GND

7. Buzzer

   • Description: An audio signaling device.
   • Pins: PIN, GND

8. 5V Relay

   • Description: A relay module that operates at 5V.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

9. ESP32-CAM

   • Description: A camera module based on the ESP32 microcontroller.
   • Pins: 5V, GND, IO12, IO13, IO15, IO14, IO2, IO4, VOT, VOR, VCC, IO0, IO16, 3V3

Wiring Details

Arduino UNO

• 3.3V: Connected to Fingerprint Scanner VCC
• 5V: Connected to 5V Relay VCC, ESP32-CAM 5V
• GND: Connected to 12V Solenoid Lock GND, 12V Power Supply -, 12V Blue LED GND, Fingerprint Scanner GND, Buzzer GND, 5V Relay GND, ESP32-CAM GND
• Vin: Connected to 12V Power Supply +
• D13: Connected to 4X4 Membrane Matrix Keypad C4
• D12: Connected to 4X4 Membrane Matrix Keypad C3
• D11: Connected to 4X4 Membrane Matrix Keypad C2
• D10: Connected to 4X4 Membrane Matrix Keypad C1
• D9: Connected to 4X4 Membrane Matrix Keypad R4
• D8: Connected to 4X4 Membrane Matrix Keypad R3
• D7: Connected to 4X4 Membrane Matrix Keypad R2
• D6: Connected to 4X4 Membrane Matrix Keypad R1
• D5: Connected to Buzzer PIN
• D4: Connected to 5V Relay In
• D3: Connected to Fingerprint Scanner RX
• D2: Connected to Fingerprint Scanner TX
• D1: Connected to ESP32-CAM VOT
• D0: Connected to ESP32-CAM VOR

4X4 Membrane Matrix Keypad

• C4: Connected to Arduino UNO D13
• C3: Connected to Arduino UNO D12
• C2: Connected to Arduino UNO D11
• C1: Connected to Arduino UNO D10
• R4: Connected to Arduino UNO D9
• R3: Connected to Arduino UNO D8
• R2: Connected to Arduino UNO D7
• R1: Connected to Arduino UNO D6

12V Blue LED

• GND: Connected to 12V Power Supply -
• VCC: Connected to 12V Power Supply +

12V Power Supply

• +: Connected to 12V Blue LED VCC, 5V Relay Common terminal, Arduino UNO Vin
• -: Connected to 12V Solenoid Lock GND, 12V Blue LED GND, Fingerprint Scanner GND, Arduino UNO GND, Buzzer GND

12V Solenoid Lock

• GND: Connected to 12V Power Supply -
• VCC: Connected to 5V Relay Normally Open

Fingerprint Scanner

• VCC: Connected to Arduino UNO 3.3V
• TX: Connected to Arduino UNO D2
• RX: Connected to Arduino UNO D3
• GND: Connected to 12V Power Supply -

Buzzer

• PIN: Connected to Arduino UNO D5
• GND: Connected to 12V Power Supply -

5V Relay

• Normally Open: Connected to 12V Solenoid Lock VCC
• Common terminal: Connected to 12V Power Supply +
• In: Connected to Arduino UNO D4
• GND: Connected to Arduino UNO GND
• VCC: Connected to Arduino UNO 5V

ESP32-CAM

• 5V: Connected to Arduino UNO 5V
• GND: Connected to Arduino UNO GND
• VOT: Connected to Arduino UNO D1
• VOR: Connected to Arduino UNO D0

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)