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4×4 Matrix Keypad

Ultra-thin design & adhesive backing provides easy integration to any project
Excellent price-performance ratio
Easy communication with any microcontroller
5 pins 2.54mm pitch connector, 4x 4type 16 keys.
Sticker can peel off for adhesive mounting.
Operating Voltage (V): 12 DC

SKU: AA084 Categories: Electronic Modules, Electronic Switches/Keypads Tag: Sale

35,00 EGP

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Description

Description: Self-adhesive membrane keypad 4×4 – 16 keys

Diaphragm keypad equipped with 16 keys in 4 x 4 arrangement.It has numbers: from 0 to 9, letters: A, B, C, D and special characters: * i #. On the back of the keyboard there is a self-adhesive tape for easy installation. The keyboard is equipped with 8-pin tape with a 2.54 mm grid, so it can be connected to the main module, such as Arduino or STM32 using connection cables or through a goldpin strip.The keyboard can be used as a data input device.

Membrane keyboard with 16 keys.

How to connect the keyboard

The keyboard can be connected in two ways. The layout of the outputs is shown in the figure below.

Pin Number	Description
ROWS
1	PIN1 is taken out from 1st ROW
2	PIN2 is taken out from 2nd ROW
3	PIN3 is taken out from 3rd ROW
4	PIN4 is taken out from 4th ROW
COLUMN
5	PIN5 is taken out from 1st COLUMN
6	PIN6 is taken out from 2nd COLUMN
7	PIN7 is taken out from 3rd COLUMN
8	PIN8 is taken out from 4th COLUMN

The layout of the outputs and how to connect the keyboard.

Diaphragm keypad specifications

Maximum Rating: 24 VDC, 30mA
Number of buttons: 16
Dimensions: 77 x 70 x 0.8 mm
Belt length with connector: 83 mm
Type of connector: 1 x 8 pin – female raster 2.54 (goldpin connector)

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Pin Connections

1 Table

Pin Connections Table 1

Arduino Uno	4x4 Matrix Keypad	Connection Details
D9	Pin 1 (Row 1)	Keypad Row 1 connection
D8	Pin 2 (Row 2)	Keypad Row 2 connection
D7	Pin 3 (Row 3)	Keypad Row 3 connection
D6	Pin 4 (Row 4)	Keypad Row 4 connection
D5	Pin 5 (Col 1)	Keypad Column 1 connection
D4	Pin 6 (Col 2)	Keypad Column 2 connection
D3	Pin 7 (Col 3)	Keypad Column 3 connection
D2	Pin 8 (Col 4)	Keypad Column 4 connection

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Arduino Uno 4x4 Matrix Keypad

1 Example • C/C++

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Main Keypad Reading Code

Code Comments:

This code initializes the 4x4 keypad mapping and continually scans it in the loop, printing any pressed button to the Serial Monitor.

📄 File: main_keypad_reading_code.inoArduino Uno

1417 characters

1/*

2 * ekostra.com

3 * ekostra electronics store in egypt

4 */

6// Include the Keypad library to handle the matrix scanning logic

7#include <Keypad.h>

9// Define the number of rows and columns in our matrix keypad

10const byte ROWS = 4; // 4 Rows

11const byte COLS = 4; // 4 Columns

13// Define the keymap based on the physical layout of the 4x4 keypad

14char hexaKeys[ROWS][COLS] = {

15 {'1', '2', '3', 'A'},

16 {'4', '5', '6', 'B'},

17 {'7', '8', '9', 'C'},

18 {'*', '0', '#', 'D'}

19};

21// Connect keypad ROW1, ROW2, ROW3 and ROW4 to these Arduino digital pins

22byte rowPins[ROWS] = {9, 8, 7, 6};

24// Connect keypad COL1, COL2, COL3 and COL4 to these Arduino digital pins

25byte colPins[COLS] = {5, 4, 3, 2};

27// Create a custom Keypad object with our layout and pin definitions

28Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

30void setup() {

31 // Initialize serial communication at 9600 baud for PC monitoring

32 Serial.begin(9600);

34 // Print a startup message

35 Serial.println("4x4 Keypad Initialized. Ready for input.");

36}

38void loop() {

39 // Read the currently pressed key from the keypad

40 // getKey() returns a non-null char if a key is actively pressed

41 char customKey = customKeypad.getKey();

43 // Check if a valid key was captured

44 if (customKey) {

45 // Print the character corresponding to the pressed key

46 Serial.print("Key Pressed: ");

47 Serial.println(customKey);

48 }

49}

Project Notes:

This project interfaces a standard 4x4 membrane keypad with an Arduino Uno. It utilizes the Keypad library to scan the rows and columns, detecting key presses and displaying the corresponding character on the Serial Monitor.

Required Libraries:

KeypadGitHub

[acf_vc_integrator get_field_data_from="" field_group="25154" field_from_25154="field_694d5bea250d3" show_label="default" align="default" gallery_columns="" gm_show_placecard="default" gm_map_type_control="default" gm_fullscreen_control="default" gm_street_view_control="default" gm_zoom_control="default" gm_scale="default" hidden_field_name="ARDUINO CODE"]

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Specification

General

WeightWeight	7,0000 g
Dimensions	165 × 70 × 1 cm
voltagev	DC 35V
operating-current-a	0.1
contact-resistance	500Ω
insulation-resistance-m	100
dielectric-strength	250VRms