กลับไปหน้ารวมไฟล์
4-digit-password-access-system-407745-en.md

Using an LCD (16x4), some pushbuttons, a buzzer and a beginner understanding level of coding with Arduino.... this project was born! :D

Watch the video to see how it works!

EXPANDED TECHNICAL DETAILS

Physical Security PIN Matrix

A professional-grade implementation of a keypad-based security system, ideal for controlling electronic door locks or safe boxes.

  • Keypad Scanning Logic Kernel: The Arduino uses the Keypad.h library to monitor a 4x4 matrix keypad. The firmware features a "Non-Blocking" input buffer, allowing the user to enter a 4-digit PIN while the Arduino continues to update an LCD.
  • Relay-Based Actuator Interface: Upon entry of the correct PIN, the Arduino triggers a high-current relay. This relay activates a 12V solenoid door strike, unlocking the entrance for a pre-defined duration (e.g., 5 seconds).

Safety

  • Locked-Out Anti-Brute-Force: If the incorrect PIN is entered 3 times, the Arduino deactivates the keypad for 60 seconds and sounds a 100dB buzzer, preventing unauthorized access attempts.

ข้อมูล Frontmatter ดั้งเดิม 

title: "4-digit Password Access System"
description: "Arduino 4-digit password access system."
author: "c010rblind3ngineer"
category: ""
tags:
  - "weather"
  - "environmental sensing"
  - "monitoring"
views: 980
likes: 1
price: 1120
difficulty: "Intermediate"
components:
  - "1x Jumper wires (generic)"
  - "1x Buzzer"
  - "1x Arduino UNO"
  - "4x Resistor 1k ohm"
  - "1x LED, Green"
  - "4x Tactile Switch, Top Actuated"
  - "1x LED, Red"
  - "1x Breadboard (generic)"
  - "3x Resistor 220 ohm"
  - "1x Alphanumeric LCD, 16 x 2"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles:
  - "https://projects.arduinocontent.cc/bf8cb4f6-3450-4a14-80d7-634aa4bf0e51.ino"
  - "https://github.com/c010rblind3ngineer/4-digit-Password-Access-System.git"
  - "https://projects.arduinocontent.cc/bf8cb4f6-3450-4a14-80d7-634aa4bf0e51.ino"
documentationLinks: []
passwordHash: "c2c78ad4b3010ef9f6cc02ecc52a1034a77528c2b862514949a107ef75946a72"
encryptedPayload: "U2FsdGVkX1+tnTbrDB5WHdILLthl1N0HUAzi5vB8d0kCeYTU3LgU6NaLI2/bSVEi5CbIBC16Ls25d0rm1jF7ah+TS/K8VXBqYxpS4sUFfzo="
seoDescription: "Build an Arduino 4-digit Password Access System for your security projects with this easy DIY guide."
videoLinks:
  - "https://www.youtube.com/embed/DZPSPPkjrfE"
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/4-digit-password-access-system-407745_cover.jpg"
lang: "en"