4 x 4 16 Keys Matrix Array 4*4 Switch Keypad Keyboard Module for Arduino PRO44 ,R17

Fr8,500

This high quality 4×4 Keypad Matrix lets you quickly add controls to your electronics projects. It offers 0-9 numerals, A-D letters, and standard star(*) and hash(#) symbols.

In stock

SKU: VAR4146 Category:

Description

This high quality 4×4 Keypad Matrix lets you quickly add controls to your electronics projects. It offers 0-9 numerals, A-D letters, and standard star(*) and hash(#) symbols.

Features:

  • 100% brand new and high quality.
  • 16 Button Matrix 0-9 # * A-D
  • Excellent price-performance ratio Easy communication with any microcontroller

Getting started with the 16 Key Membrane Switch Keypad Keyboard 4x4x4 Matrix Array

We are going to show how to connect a 4 x 4 Membrane Keypad to an Arduino.

Step1: Hardware required

Step2: Connecting the Hardware

The connections are pretty straightforward.  Start by connecting pin 1 of keypad to digital pin 9 on Arduino. Now keep on connecting the pins leftwards like 2 with 8, 3 with 7 etc.

Keypad                                                                                          Arduino UNO

PIN 1                                         Connected to                                   Pin 9

PIN2                                         Connected to                                    Pin 8

PIN3                                         Connected to                                    Pin 7

PIN4                                         Connected to                                    Pin 6

PIN5                                         Connected to                                    Pin 5

PIN6                                         Connected to                                    Pin 4

PIN7                                         Connected to                                    Pin 3

PIN8                                         Connected to                                    Pin 2

 

Step3: Upload the Code

#include “Adafruit_Keypad.h”

const byte ROWS = 4; // rows
const byte COLS = 4; // columns
//define the symbols on the buttons of the keypads
char keys[ROWS][COLS] = {
{‘1′,’2′,’3′,’A’},
{‘4′,’5′,’6′,’B’},
{‘7′,’8′,’9′,’C’},
{‘*’,’0′,’#’,’D’}
};
byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Adafruit_Keypad customKeypad = Adafruit_Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
Serial.begin(9600);
customKeypad.begin();

}

void loop() {
// put your main code here, to run repeatedly:
customKeypad.tick();

while(customKeypad.available()){
keypadEvent e = customKeypad.read();
Serial.print((char)e.bit.KEY);
if(e.bit.EVENT == KEY_JUST_PRESSED) Serial.println(” pressed”);
else if(e.bit.EVENT == KEY_JUST_RELEASED) Serial.println(” released”);
}

delay(10);
}

Step4: Testing the circuit

Here’s how the output looks like in the serial monitor.