{"id":8117,"date":"2022-05-11T22:57:23","date_gmt":"2022-05-11T17:27:23","guid":{"rendered":"http:\/\/myprojectideas.com\/?p=8117"},"modified":"2025-10-29T12:34:45","modified_gmt":"2025-10-29T12:34:45","slug":"arduino-keyless-door-lock-system-arduino-project","status":"publish","type":"post","link":"https:\/\/rudelabs.ai\/blogs\/arduino-keyless-door-lock-system-arduino-project\/","title":{"rendered":"Arduino Keyless Door Lock System | Arduino Project"},"content":{"rendered":"<h2><strong style=\"font-size: 26px;\">Introduction<\/strong><\/h2>\n<p>In this Arduino project tutorial, we will create an Arduino Keyless Door Lock System With Keypad And LCD. For this, we will use a micro servo which will act as a lock, an LCD will be used for display purposes and a keypad to enter the password.<\/p>\n<p>In order to build physical projects, the components can be purchased online or from any electronics centre.<\/p>\n<p>For the online projects, the <a href=\"https:\/\/www.tinkercad.com\/\">TinkerCad<\/a> website can be used.<\/p>\n<iframe loading=\"lazy\"  id=\"_ytid_59880\"  width=\"1080\" height=\"607\"  data-origwidth=\"1080\" data-origheight=\"607\" src=\"https:\/\/www.youtube.com\/embed\/W2qY1ODvmW0?enablejsapi=1&autoplay=0&cc_load_policy=0&cc_lang_pref=&iv_load_policy=1&loop=0&rel=1&fs=1&playsinline=0&autohide=2&theme=dark&color=red&controls=1&\" class=\"__youtube_prefs__  no-lazyload\" title=\"YouTube player\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe>\n<p>&nbsp;<\/p>\n<h2><strong>Supplies<\/strong><\/h2>\n<p>In order to make Arduino Keyless Door Lock System With Keypad And LCD, we will require the following components:<\/p>\n<h3><strong>Components<\/strong><\/h3>\n<ul>\n<li>Arduino Uno R3<\/li>\n<li>1 KeyPad 4&#215;4<\/li>\n<li>LCD 16&#215;2<\/li>\n<li>1 micro servo<\/li>\n<li>1 small BreadBoard<\/li>\n<li>2 LEDs<\/li>\n<li>3 Resistors<\/li>\n<li>Connecting wires<\/li>\n<\/ul>\n<h2><strong>Circuit Diagram<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-18317 size-full\" src=\"https:\/\/rudelabs.ai\/blogs\/wp-content\/uploads\/2022\/05\/word-image-36.webp\" alt=\"Arduino Keyless Door Lock System\" width=\"1517\" height=\"597\" \/><\/p>\n<h2><strong>Steps To Make Arduino Keyless Door Lock System<\/strong><\/h2>\n<p><strong>Step 1:<\/strong> Gather all the components on the Digital Board or Physical Table.<\/p>\n<p><strong>Step 2: <\/strong>Plug LEDs on the BreadBoard.<\/p>\n<p><strong>Micro Servo:<\/strong><\/p>\n<p><strong>Step 3: <\/strong>Connect the Ground Terminal of it to the Ground(GND) pin of the Arduino using a black coloured wire.<\/p>\n<p><strong>Step 4: <\/strong>Connect the signal terminal of it to the 7 number pin of the Arduino Uno.<\/p>\n<p><strong>Step 5:<\/strong> Connect the Power terminal of it to the 5V power supply pin of the Arduino Uno.<\/p>\n<p><strong>LEDs:<\/strong><\/p>\n<p><strong>Step 6:<\/strong> Connect the Cathode Terminal of each to the Ground(GND) pin of the Arduino using a black coloured wire thru a resistor, as shown in the figure.<\/p>\n<p><strong>Step 7:<\/strong> Connect the Anode terminal of each to the A0 &amp; A1 pin number of the Arduino, respectively, as shown in the figure.<\/p>\n<p><strong>Keypad:<\/strong><\/p>\n<p><strong>Step 8:<\/strong> Connect the Row 1 to 4 and Column 1 to 3 of it to the 0 to 6 number pins of the Arduino, respectively, as shown in the figure.<\/p>\n<p><strong>LCD:<\/strong><\/p>\n<p><strong>Step 9:<\/strong> Connect the Power &amp; the LED anode terminal of it to the 5V pin of the Arduino.<\/p>\n<p><strong>Step 10:<\/strong> Connect the Ground, Contrast, Read\/Write &amp; LED cathode terminals of it to the GND pin of the Arduino, as shown in the circuit.<\/p>\n<p><strong>Step 11:<\/strong> Connect the Register Select, Enable, &amp; DB4 to DB7 pins of it to the 8 to 13 number pins of the Arduino, respectively, as shown in the figure.<\/p>\n<h2><strong>Source Code<\/strong><\/h2>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">#include &lt;LiquidCrystal.h&gt;\r\n\r\n#include &lt;Keypad.h&gt;\r\n\r\n#include &lt;Servo.h&gt;\r\n\r\nint servoState;\r\n\r\nint open = 0;\r\n\r\nint close = 90;\r\n\r\nint a = 0, b = 0, c = 0, d = 0;\r\n\r\nint var = 0;\r\n\r\nint C1 = 1, C2 = 2, C3 = 3, C4 = 4;\r\n\r\nchar f='*';\r\n\r\nconst byte rows = 4;\r\n\r\nconst byte columns = 3;\r\n\r\nchar keyPad[rows][columns] =\r\n\r\n{\r\n\r\n{'1','2','3'},\r\n\r\n{'4','5','6'},\r\n\r\n{'7','8','9'},\r\n\r\n{'*','0','#'}\r\n\r\n};\r\n\r\nbyte pinRows[rows] = {0, 6, 5, 4};\r\n\r\nbyte pinColumns[columns] = {3, 2, 1};\r\n\r\nServo lock;\r\n\r\nKeypad keypad = Keypad(makeKeymap(keyPad), pinRows, pinColumns, rows, columns );\r\n\r\nLiquidCrystal lcd(8, 9, 10, 11, 12, 13);\r\n\r\nvoid setup()\r\n\r\n{\r\n\r\nlcd.begin(16,2);\r\n\r\npinMode(A0, OUTPUT);\r\n\r\npinMode(A1, OUTPUT);\r\n\r\nlock.attach(7);\r\n\r\nlock.write(close);\r\n\r\nservoState = 1;\r\n\r\n}\r\n\r\n\r\n\r\n\r\nvoid loop()\r\n\r\n{\r\n\r\nchar key = keypad.getKey();\r\n\r\nif(key)\r\n\r\n{\r\n\r\nlcd.setCursor(6+var, 1), lcd.print(key);\r\n\r\nlcd.setCursor(6+var, 1), lcd.print(f);\r\n\r\nkey = key - 48;\r\n\r\nvar++;\r\n\r\n\r\n\r\n\r\nswitch(var)\r\n\r\n{\r\n\r\ncase 1: a = key;\r\n\r\nbreak;\r\n\r\ncase 2: b = key;\r\n\r\nbreak;\r\n\r\ncase 3: c = key;\r\n\r\nbreak;\r\n\r\ncase 4: d = key;\r\n\r\n\r\n\r\n\r\ndelay(50);\r\n\r\n\r\n\r\n\r\nif(a == C1 &amp;&amp; b == C2 &amp;&amp; c == C3 &amp;&amp; d == C4)\r\n\r\n{\r\n\r\nlcd.clear();\r\n\r\nlcd.setCursor(4,0);\r\n\r\nlcd.print(\" Welcome \");\r\n\r\nlcd.setCursor(5,1);\r\n\r\nlcd.print(\" Human !\");\r\n\r\nlock.write(open);\r\n\r\n\r\n\r\n\r\ndigitalWrite(A0, HIGH);\r\n\r\ndelay(1000);\r\n\r\nlcd.clear();\r\n\r\ndigitalWrite(A0, LOW);\r\n\r\n}\r\n\r\nelse\r\n\r\n{\r\n\r\nlcd.clear();\r\n\r\nlcd.setCursor(4,0);\r\n\r\nlcd.print(\"Incorrect\");\r\n\r\nlcd.setCursor(4,1);\r\n\r\nlcd.print(\"Password\");\r\n\r\ndigitalWrite(A1, HIGH);\r\n\r\ndelay(1000);\r\n\r\nlcd.clear();\r\n\r\ndigitalWrite(A1, LOW);\r\n\r\n}\r\n\r\nvar = 0;\r\n\r\nlcd.clear();\r\n\r\nbreak;\r\n\r\n}\r\n\r\n}\r\n\r\nif(!key)\r\n\r\n{\r\n\r\nlcd.setCursor(0, 0), lcd.print(\"Enter Password :\");\r\n\r\n}\r\n\r\ndelay(2);\r\n\r\n}<\/pre>\n<h2><strong>Explanation of the Code<\/strong><\/h2>\n<p>In the beginning, we have included three header files for LCD, Keypad and servo, respectively.<\/p>\n<p>1. Firstly, we have initialised class arrays and variables that will be required in the function.<\/p>\n<p>2. In the setup function, we have configured the LED pins for output purposes and defined the servo state to close at the beginning.<\/p>\n<p>3. In the loop function, we take the key and print it in an asterisk for privacy and confidentiality. Simultaneously taking the keys using a switch case and matching the key entered to the password that we have set in the keypad using the if statement and proceeding further using the if-else statement. In case the entered key does not match the predefined key array, we are printing the incorrect password in the LCD using its cursor.<\/p>\n<p>4. The servo will be at 90 degrees initially, and when the password matches, it will rotate to 0 degrees.<\/p>\n<p>5. In case of success, we are glowing green LED by giving it High power; else, Red LED will glow for a second.<\/p>\n<h2><a id=\"post-8117-_1fob9te\"><\/a><strong>Output<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-18318 size-full\" src=\"https:\/\/rudelabs.ai\/blogs\/wp-content\/uploads\/2022\/05\/Arduino-Keyless-Door-Lock-System-With-Keypad-And-LCD.webp\" alt=\"Arduino Keyless Door Lock System\" width=\"1035\" height=\"621\" \/><\/p>\n<p>We will get the following output on the successful completion of the project.<\/p>\n<p>On starting, the Servo will be at a 90-degree angle from its regular position and on entering the correct password(1234), it will turn to 0 degrees, and the lock will open in this way.<\/p>\n<p>Entering the incorrect password will not change its axis, and the LCD will display &#8220;Incorrect password&#8221;.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this Arduino project tutorial, we will create an Arduino Keyless Door Lock System With Keypad And LCD. For this, we will use a micro servo.<\/p>\n","protected":false},"author":1,"featured_media":8118,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[31,4,7],"tags":[],"class_list":["post-8117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-coding-basics","category-coding-projects"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Arduino Keyless Door Lock System | Arduino Project - RUDE LABS<\/title>\n<meta name=\"description\" content=\"In this Arduino project tutorial, we will create an Arduino Keyless Door Lock System With Keypad And LCD. 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