4x4 Push Button Keyboard Matrix

Technical specifications

• Push-button buttons
• Total number of buttons: 16
• Array type array with line / column connections
• Output of 8 pins (4 columns + 4 lines)

This product is a module with 16 push-button buttons useful to enter data into your application. The product is suitable for your innovative Arduino development pad projects, requiring just 8 connections to help you read 16 buttons.

To understand how to connect and operate the keyboard with 4x4 buttons, you can see the attached image at the bottom of the page.

The main advantage of this type of assembly is that you only need 8 control pins to read the status of the 16 buttons, but there is also the disadvantage that multiple buttons can not be read at the same time.

Instructions for use

1. Connect the module to the development board.

To use this module, you need a development board that has at least 8 GPIO digital pins.

The connection scheme is the following:

2. Operating code.

This matrix keypad consists of the use of 4 pins as output and 4 pins as input. The principle on which this product works is simple: a signal is output to a pin initialized as an output and the signal is detected on an input pin. This happens when a button is pressed. For example, if we issue a signal to pin 2 and a signal is detected on pin 10, it means that the "S3" button has been pressed.

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