4X4微動開關矩陣鍵盤模組 16 外擴鍵盤模組

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4X4微動開關矩陣鍵盤模組 16 外擴鍵盤模組

16-Button Tactile Keypad Matrix

This is a 4×4 matrix of tactile buttons solidly mounted on to a PCB with an 8-pin single-row 0.1″ pitch header. The switches are clearly numbered with white silkscreen printing. Each switch gives satisfying tactile feedback when pressed.

The 0.1″ single row male header is breadboard friendly. The overall dimensions of the PCB are 39mm x 43mm.
This is a great way to experiment with matrix decoding on the Arduino!

#include <Keypad.h>

int speakerPin = 12; // speaker connected to digital pin 12

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns

char keys[ROWS][COLS] = {
{‘a’,’b’,’c’,’d’},
{‘e’,’f’,’g’,’h’},
{‘i’,’j’,’k’,’l’},
{‘m’,’n’,’o’,’p’}
};
byte rowPins[ROWS] = {2, 3, 4, 5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6, 7, 8, 9}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){

Serial.begin (9600);

pinMode(speakerPin, OUTPUT); // sets the speakerPin to be an output

}

void loop(){
char key = keypad.getKey();

if (key != NO_KEY){
Serial.println(key);

if (key==’a’){ beep(speakerPin,2093,100);}
if (key==’b’){ beep(speakerPin,2349,100);}
if (key==’c’){ beep(speakerPin,2637,100);}
if (key==’d’){ beep(speakerPin,2793,100);}
if (key==’e’){ beep(speakerPin,3136,100);}
if (key==’f’){ beep(speakerPin,3520,100);}
if (key==’g’){ beep(speakerPin,3951,100);}
if (key==’h’){ beep(speakerPin,4186,100);}
if (key==’i’){ beep(speakerPin,2093,100);}
if (key==’j’){ beep(speakerPin,2349,100);}
if (key==’k’){ beep(speakerPin,2637,100);}
if (key==’l’){ beep(speakerPin,2793,100);}
if (key==’m’){ beep(speakerPin,3136,100);}
if (key==’n’){ beep(speakerPin,3520,100);}
if (key==’o’){ beep(speakerPin,3951,100);}
if (key==’p’){ beep(speakerPin,4186,100);}
}
}

void beep (unsigned char speakerPin, int frequencyInHertz, long timeInMilliseconds){ // the sound producing function
int x;
long delayAmount = (long)(1000000/frequencyInHertz);
long loopTime = (long)((timeInMilliseconds*1000)/(delayAmount*2));
for (x=0;x<loopTime;x++)
{
digitalWrite(speakerPin,HIGH);
delayMicroseconds(delayAmount);
digitalWrite(speakerPin,LOW);
delayMicroseconds(delayAmount);
}
}