In this tutorial we will learn how to make an Arduino Security Panel System with using Keypad and LCD Display.\r<br>We will be able to open the door by entering the correct password.\r<br>\r<br>---\r<br>\r<br>Hardware Required :\r<br>\r<br>Arduino Board - \r<br>Keypad 4x4 - \r<br>LCD 16x02 - \r<br>LED\r<br>Wires - / \r<br>Breadboard - \r<br>Resistor 220ohm\r<br>Potentiometer 10k - \r<br>\r<br>Recommended Shopping Site -- \r<br>Arduino Starter Learning Kit -- \r<br>Arduino Compatible Tools -- \r<br>Arduino Modules Boards -- \r<br>Professional Tools -- \r<br>3D Printer and Tools -- \r<br>Flash Deals for Electronic -- \r<br>Mobile Device Deals -- \r<br>\r<br>---\r<br>\r<br>LCD 16x02 Connection:\r<br>\r<br>The Arduinos +5V and GND will be connected to the pin of the breadboard\r<br>The LCD has 16 pins and the first one from left to right is the Ground (GND) pin\r<br>The second pin is the VCC which we connect the +5V pin on the breadboard.\r<br>Next is the Vo pin on which we can attach a potentiometer for the contrast of the display\r<br>The RS pin will be connected to the A0 pin of the Arduino.\r<br>The RW pin will be connected to the GND pin of the breadboard.\r<br>The E pin will be connected to the A1 pin of the Arduino.\r<br>\r<br>---\r<br>\r<br>Keypad 4x4 Connections:\r<br>\r<br>The keypad has 8 pins, 4 of them are for the rows and other 4 pin for the columns.\r<br>The keypad Im using is 4x4. It has an additional connection input. The keypad used in the circuit diagram is 3x4.\r<br>The Keypads pins will be connected respectively to the Digital 1-2-3-4-5-6-7-8 pin of the Arduino.\r<br>\r<br>---\r<br>\r<br>Source Code:\r<br>\r<br>Get the source code - \r<br>\r<br>Get the Keypad Library - \r<br>Put the Keypad folder in arduinolibraries\r<br>\r<br>Circuit Schematic Program -
