4×4 Matrix 16 Keypad Keyboard Module 16 Button MCU

The 4×4 Matrix 16 Keypad Keyboard is a widely used input device in various projects, providing a user-friendly interface with a total of 16 keys that allow for the same input values. This module is a non-encoded matrix keypad, meaning it consists of 16 keys arranged in parallel, which can easily be accessed and pressed. The keys are organized so that each row and column connects through external pins; pins R1-R4 control the rows, while L1-L4 control the columns, ensuring straightforward wiring.

Constructed with microswitch buttons, the keypad offers a tactile feel, enhancing user interaction. It features four 3mm (M3) mounting holes for secure installation in different setups. The pin designations are clearly marked on the PCB, facilitating easy identification during connections. The module uses four pins for the ‘x’ coordinate and four pins for the ‘y’ coordinate, enabling efficient input detection. Additionally, the keypad comes with pre-soldered pin headers, making integration into projects even more convenient and user-friendly.

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.

4×4 Matrix 16 Keypad Keyboard Features:

Package Includes:

• 1 x 4×4 Matrix 16 Keypad Keyboard Module 16 Button MCU