Description
Description
*It has 8P DuPont head, pitch 2.54mm, can be inserted in the Pin connection circuit; Peel off the white sticker on the back of the keyboard can be securely affixed to the surface of the chassis *Key Operating Force 150-200N *Rebound time 1 (ms) *Operating Temperature 60 (℃) Specification *Circuit Rating: 35V (DC), 100mA, 1W *Contact resistance: 10Ω ~ 500Ω (Varies according to the lead lengths and different from those of the material used) *Insulation resistance: 100MΩ 100V *Dielectric Strength: 250VRms (50 ~ 60Hz 1min) *Electric shock jitter: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.
Step3: Setting up the library
To install the library navigate to the Sketch > Include Library > Manage Libraries…Wait for Library Manager to download libraries index and update list of installed libraries.
Filter your search by typing ‘keypad’. There should be a couple entries. Look for Keypad by Mark Stanley, Alexander Brevig. You have to scroll a little bit. Click on that entry, and then select Install.
Step4: Upload the Code
#include <Keypad.h> const byte ROWS = 4; //four rows const byte COLS = 4; //four 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 //Create an object of keypad Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); void setup(){ Serial.begin(9600); } void loop(){ char key = keypad.getKey();// Read the key // Print if key pressed if (key){ Serial.print(“Key Pressed : “); Serial.println(key); }} NOTE: If you get stray error the problem is with your “ ” and ‘ characters .Replace them with ordinary quotes “ and’. And you should be fine.Step5: Testing the circuit
Here’s how the output looks like in the serial monitor.
