4×4 Matrix 16 Button Keypad Keyboard Module

4×4 Matrix 16 Button Keypad Keyboard Module

The 4 x 4 matrix keypad serves as a primary input method in many projects, offering 16 keys for inputting various commands or data. The 4 x 4 Matrix Keypad Module is an unencoded matrix keypad comprising 16 keys arranged in parallel. Each key’s connection is established through pins located on the module – pins R1-R4 control the rows, while L1-L4 control the columns.

This keypad module consists of microswitch buttons arranged in a 4×4 grid format. It features four 3mm (M3) mounting holes for easy installation. The pin designations are clearly labeled on the PCB, with four pins allocated for the ‘x’ coordinate and the remaining four for the ‘y’ coordinate.

Notably, the module comes pre-equipped with soldered pin headers, simplifying the integration process into various projects.

How it Works

First test whether any key is pressed down. Connect power to rows, so they are High level. Then set all the rows R1-R4 as Low and then detect the status of the columns. Any column of Low indicates there is key pressing and that the key is among the 4 keys of the column. If all columns are High, it means no key is pressed down. Next, locate the key. Since the column in which the pressed key lies is identified, knowing the line would finalize the testing. Thus, set the rows as Low in turns until any is unveiled accordingly – other rows will still be High.
Now the row can be identified. Detect the status of each column in turns. The column tested Low is the one intersecting with the line – their cross point is just the key pressed.

Features

1. 4×4 Matrix Keyboard Module with 16 buttons
2. Small in size and hence Save space
3. More convenient to use
4. Expanded development application modules for single chip
5. With 16 keys and 8 pin

Specification:

Package Includes

1 x 4*4 Matrix 16 Keypad Keyboard Module 16 Button MCU