🔒 Fingerprint Door Lock

Secure your room with biometrics. Actuate a servo mechanism with an optical scanner.

📋 Overview

The AS608 fingerprint scanner handles the complex image processing and template matching on-board. It simply tells the Arduino if a match was found and what ID it corresponds to.

What you'll learn: SoftwareSerial communication, biometric module interfacing, and securing physical mechanisms.

Estimated time: 2-3 hours. Difficulty: ⭐⭐⭐ Intermediate.

🧩 Components Needed

Component	Specification	Qty	Notes
Arduino Uno R3	5V	1
AS608 Fingerprint Sensor	Optical	1
Servo Motor	MG996R	1	Heavy duty for lock
Relay/External Power	5V 2A	1	Servos draw heavy current

📖 Step-by-Step Tutorial

Enroll Fingerprints

First, run the "Enroll" example sketch from the Adafruit Fingerprint library to save your fingerprints to the sensors memory.

Wiring Scanner

Sensor VCC to 5V (or 3.3V depending on module), TX to Pin 2, RX to Pin 3.

Wiring Servo

Connect the servo signal to Pin 9. Power it externally if using a heavy-duty servo.

Upload the Lock Code

The lock sketch checks for matches and sweeps the servo if ID is validated.

💡

Optical fingerprint scanners are sensitive to dirt and moisture. Keep the glass clean for reliable matches.

💻 Code / Configuration

fingerprint_lock.ino

INO

// Fingerprint Lock
#include <Adafruit_Fingerprint.h>
#include <Servo.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
Servo lockServo;

void setup() {
  Serial.begin(9600);
  finger.begin(57600);
  lockServo.attach(9);
  lockServo.write(0); // Locked position
}

void loop() {
  int p = finger.getImage();
  if (p != FINGERPRINT_OK) return;
  
  p = finger.image2Tz();
  if (p != FINGERPRINT_OK) return;
  
  p = finger.fingerFastSearch();
  if (p == FINGERPRINT_OK) {

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