Membrane 4X4 Matrix Keypad

Punch in your secret key into this numer­ic matrix key­pad. This key­pad has 12 but­tons, arranged in a tele­phone-line 4x4 grid. It’s made of a thin, flex­i­ble mem­brane mate­r­i­al with an adhe­sive back­ing (just remove the paper) so you can attach it to near­ly any­thing. The keys are con­nect­ed into a matrix, so you only need 8 micro­con­troller pins (4‑columns and 4‑rows) to scan through the pad. Check the tuto­ri­als tab for links to an Arduino library and exam­ple code.We include a 8‑pin extra-long head­er strip so you can plug this into a bread­board with ease.DETAILSPad Size: 70 * 77 * 0.8mmCable Length: 85mm(include con­nec­tor)Con­nec­tor: 8 pins female head­er, 2.54mm PitchMax Cir­cuit Rat­ing: 35VDC, 100mAInsu­la­tion Spe: 100M Ohm, 100VDielec­tric With­stand: 250VRms (60Hz, 1min)Con­tact Bounce: <=5msLife Expectan­cy: 1 mil­lion clo­suresOper­a­tion Tem­per­a­ture: ‑20 to 40 °CThere is a very nice Matrix Key­pad Arduino library that works great with this item. The only thing we sug­gest is to change the ini­tial­iza­tion code in the exam­ples to this:Arduino #include "Arduino.h" #include "Keypad.h" const byte ROWS = 4; //four rows const byte COLS = 4; //three columns char keys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );123456789101112131415#include “Arduino.h”#include “Keypad.h” con­st byte ROWS = 4; //four rowscon­st byte COLS = 4; //three columnschar keys[ROWS][COLS] = {  {‘1’,‘2’,‘3’,‘A’},  {‘4’,‘5’,‘6’,‘B’},  {‘7’,‘8’,‘9’,‘C’},  {‘*’,‘0’,’#’,‘D’}};byte row­Pins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the key­padbyte colPins[COLS] = {5, 4, 3, 2}; //connect to the col­umn pinouts of the key­pad Key­pad key­pad = Key­pad( makeKeymap(keys), row­Pins, colPins, ROWS, COLS );