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Arduino Keypad and LCD with Code and Wiring Diagram | Arduino Projects with Code and Wiring Diagram
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Arduino Keypad and LCD with Code and Wiring Diagram | Arduino Projects with Code and Wiring Diagram

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In this article, I will show you how to interface a keypad to Arduino and output it to an LCD.

Keypads on devices are an essential mode of input. Without it, users cannot input numbers to a device or choose and select a function. It is a burden if there are no keypads present.

But today, I will show you the ropes in using a keypad and LCD to integrate into your next project.

Arduino Keypad and LCD: Steps in Creating the Device
Step 1: Gathering the Components
To start off, this project will have two parts: the Arduino Device and the Program. The first thing to do is to collect the hardware components and make the device. To do that, you will be needing the following:

Quantity Components
1 Arduino Uno
1 4×4 Matrix Keypad
1 LCD with I2C Interface

Step 2: Connecting the Arduino Components

Keypad and LCD wiring
Now you are ready to connect the components to the Arduino Uno. Connect the power and the ground pin to 5V and GND for the LCD. Next is to connect the pins of the keypad to the digital pins of the Arduino.

Since it has 8 pins, 4 of them will be for the columns. Connect the first four pins, starting at Digital Pin 2. Next is to connect the LAST pin of the keypad to Digital Pin 6. Basically, you are completing the wiring procedure from both ends, finishing at the middle.

Step 3: The Arduino Code
The first thing to do is install the library. There are many libraries out there you can use but the Keypad library of Nullkraft and LiquidCrystal_I2C works best for this. Download the library and install it using the library manager of the Arduino IDE.

Go to the official guide on installing libraries in Arduino for more info.

The code below works with any kind of keypad. If you have a 4 x 3 keypad, just set the columns to 3.

Step 4: Test Run
After you successfully upload the sketch, input some numbers. It will look like this.

So there you have it! Arduino Keypad and LCD. This project is intimidating at first but you will see that it is fairly easy to do. You can combine this with other Arduino projects and build an awesome system!

Feel free to write your questions about this in the comments below.
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