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

DescriptionThis 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-DExcellent price-performance ratio Easy communication with any microcontrollerGetting started with the 16 Key Membrane Switch Keypad Keyboard 4x4x4 Matrix ArrayWe are going to show how to connect a 4 x 4 Membrane Keypad to an Arduino.Step1: Hardware requiredArduino Uno4 x 4 Membrane KeypadStep2: Connecting the HardwareThe 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 UNOPIN 1                                         Connected to                                   Pin 9PIN2                                         Connected to                                    Pin 8PIN3                                         Connected to                                    Pin 7PIN4                                         Connected to                                    Pin 6PIN5                                         Connected to                                    Pin 5PIN6                                         Connected to                                    Pin 4PIN7                                         Connected to                                    Pin 3PIN8                                         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 circuitHere’s how the output looks like in the serial monitor.