Circuit Documentation

Summary

This circuit is designed as part of a door lock system that utilizes face recognition technology. The system comprises an ESP32-CAM module responsible for face recognition, a 1-Channel Relay module to control a 12V Solenoid Lock, and a ProtoSnap - Pro Mini - FTDI for additional interfacing. The solenoid lock is powered by a 12V battery. When a recognized face is detected by the ESP32-CAM, it signals the relay to activate the solenoid lock, thereby unlocking the door.

Component List

12V Solenoid Lock

• Description: An electromechanical lock actuated by a 12V supply.
• Pins: - (Ground), + (Vcc)

ESP32 - CAM

• Description: A microcontroller with integrated Wi-Fi and camera, used for face recognition.
• Pins: 5V, GND, IO12, IO13, IO15, IO14, IO2, IO4, VOT, VOR, VCC, IO0, IO16, 3V3

ProtoSnap - Pro Mini - FTDI

• Description: A breakout board used for interfacing with the ESP32-CAM.
• Pins: GND, CTS, VCC, TXO, RXI, DTR

1-Channel Relay (5V 10A)

• Description: A relay module used to control high power devices like the solenoid lock.
• Pins: NC (Normally Closed), signal, C (Common), power, NO (Normally Open), ground

12v Battery

• Description: A power source for the solenoid lock.
• Pins: - (Ground), + (Vcc)

Wiring Details

12V Solenoid Lock

• Ground: Connected to the C (Common) pin of the 1-Channel Relay.
• Vcc: Connected to the + pin of the 12v Battery.

ESP32 - CAM

• 5V: Connected to the VCC pin of the ProtoSnap - Pro Mini - FTDI and power pin of the 1-Channel Relay.
• GND: Common ground with ProtoSnap - Pro Mini - FTDI and ground pin of the 1-Channel Relay.
• IO4: Connected to the signal pin of the 1-Channel Relay.
• VOT: Connected to the RXI pin of the ProtoSnap - Pro Mini - FTDI.
• VOR: Connected to the TXO pin of the ProtoSnap - Pro Mini - FTDI.

ProtoSnap - Pro Mini - FTDI

• GND: Common ground with ESP32 - CAM and 1-Channel Relay.
• VCC: Connected to the 5V pin of the ESP32 - CAM.
• RXI: Connected to the VOT pin of the ESP32 - CAM.
• TXO: Connected to the VOR pin of the ESP32 - CAM.

1-Channel Relay (5V 10A)

• C (Common): Connected to the - pin of the 12V Solenoid Lock.
• signal: Connected to the IO4 pin of the ESP32 - CAM.
• power: Connected to the 5V pin of the ESP32 - CAM.
• ground: Common ground with ESP32 - CAM and ProtoSnap - Pro Mini - FTDI.
• NO (Normally Open): Connected to the - pin of the 12v Battery.

12v Battery

• Ground: Connected to the NO (Normally Open) pin of the 1-Channel Relay.
• Vcc: Connected to the + pin of the 12V Solenoid Lock.

Documented Code

ESP32 - CAM Code

/*
 * This Arduino Sketch is part of a door lock system using face recognition.
 * The ESP32-CAM module performs face recognition and controls a relay
 * to operate a 12V Solenoid Lock. When a recognized face is detected, the
 * relay activates the solenoid lock to unlock the door.
 */

const int relayPin = 4; // Relay signal pin connected to ESP32-CAM IO4

void setup() {
  Serial.begin(115200); // Initialize Serial communication at 115200 baud rate
  pinMode(relayPin, OUTPUT); // Set relay pin as output
  digitalWrite(relayPin, LOW); // Ensure relay is off initially
  Serial.println("ESP32-CAM initialized.");
}

void loop() {
  bool faceRecognized = false; // Placeholder for face recognition result
  // Add face recognition logic here
  if (faceRecognized) {
    digitalWrite(relayPin, HIGH); // Activate relay to unlock door
    delay(5000); // Keep the door unlocked for 5 seconds
    digitalWrite(relayPin, LOW); // Deactivate relay to lock door
  }
  delay(100); // Short delay to avoid rapid toggling
}

(Note: The code for the other microcontrollers is similar and follows the same logic as the ESP32-CAM code. The actual face recognition logic is not included in the placeholder and should be implemented accordingly.)