Keypad Controlled Door Locking System Using Arduino

In this tutorial we will learn how to make a Locking system using a Keypad and Arduino. If you type the correct Code within a time limit of 5 seconds the door will open in our case the Green LED will glow. After the 5 seconds the it will lock back in our case the Red LED will glow.

To develop this project further you can easily connect a Relay with a Lock connected to it (See the schematic below).

Watch the Video!

Also checkout this tutorial: Arduino Nano Matrix Keypad With Visuino

Step 1: What You Will Need

• Arduino UNO (Or any other Arduino)
• Keypad
• 2X LED (Red & Green)
• 2X 1K ohm Resistor
• Jumper wires
• Breadboard
• Visuino program: Download Visuino
• Optional: A Relay

Step 2: Brought by PCBWay

Thank you PCBWay for supporting this tutorial and helping users learn more about electronics.

What I like about the PCBWay is that you can get 10 boards for approximately $5 which is really cost effective for professional made boards, not to mention how much time you save!

Go check them out here. They also offer a lot of other stuff in case you might need it like assembly, 3D printing, CNC machining and a lot more.

Step 3: The Circuit

Step 4: Start Visuino, and Select the Arduino UNO Board Type

The Visuino: https://www.visuino.com also needs to be installed. Download Free version or register for a Free Trial.

Start Visuino as shown in the first picture Click on the “Tools” button on the Arduino component (Picture 1) in Visuino When the dialog appears, select “Arduino UNO” as shown on Picture 2

Step 5: In Visuino Add Components

Step 6: In Visuino Set Components

• Double click on the “Keypad1” and in the “Keys” window drag “Character Key Group” to the left side, in the properties window select “Keys” and click on the 3 dot button, now in a “Keys” window Drag 16X “Char Key” to the Left side, and for each key set “Character” in the properties window set “Character” for each in the order like you see on picture 6, for
• “Char Key1” the “Character” will be 1
• for “Char Key2” the “Character” will be 4
• for “Char Key3” the “Character” will be 7
• for “Char Key4” the “Character” will be *
• for “Char Key5” the “Character” will be 2
• and so on until the end
• Close All the Windows

• Select “Delay1” and in the properties window set “Interval (uS)” to 5000000
• Select “Delay2” and in the properties window set “Interval (uS)” to 5000000
• Select “CharToText1” and in the properties window set “Update On Each Char” to True

To Set the Keypad Code: Select “CompareValue1” and in the properties window set the “Value” in this example it is 34571

Step 7: In Visuino Connect Components

• Connect Arduino Digital Pin[6] to “Keypad1” > Rows Pin [0]
• Connect Arduino Digital Pin[7] to “Keypad1” > Rows Pin [1]
• Connect Arduino Digital Pin[8] to “Keypad1” > Rows Pin [2]
• Connect Arduino Digital Pin[9] to “Keypad1” > Rows Pin [3]
• Connect “Keypad1” > Columns Pin [0] to Arduino Digital Pin[2]
• Connect “Keypad1” > Columns Pin [1] to Arduino Digital Pin[3]
• Connect “Keypad1” > Columns Pin [2] to Arduino Digital Pin[4]
• Connect “Keypad1” > Columns Pin [3] to Arduino Digital Pin[5]
• Connect “Keypad1” > “CharacterKeyGroup16” pin [Out] to “CharMultiSource1” pin[In]
• Connect “CharMultiSource1” pin [0] to “CharToText1” pin [In]
• Connect “CharMultiSource1” pin [1] to “Delay1” pin [Start]
•  Connect “Delay1” pin [Out] to “CharToText1” pin [Clear]
• Connect “CharToText1” pin [Out] to “CompareValue1” pin [In]
• Connect “CharToText1” pin [Out] to “Delay2” pin [Start]
• Connect “CompareValue1” pin [Out] to “TFlipFlop1” pin[Set]
• Connect “Delay2” pin [Out] to “TFlipFlop1” pin[Reset]
• Connect “TFlipFlop1” pin [Out] to Arduino Digital Pin[11]
• Connect “TFlipFlop1” pin [Inverted] to Arduino Digital Pin[12]

Step 8: Generate, Compile, and Upload the Arduino Code

In Visuino, at the bottom click on the “Build” Tab, make sure the correct port is selected, then click on the “Compile/Build and Upload” button.

Step 9: Play