所需要的材料:
Arduino * 1
线材 * 8
按键膜 * 1
接线方式:
代码：
#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
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};
byte colPins[COLS] = {6,7,8,9};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
byte ledPin = 13;
boolean blink = false;
void setup(){
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH);
keypad.addEventListener(keypadEvent);
}
void loop(){
char key = keypad.getKey();
if (key != NO_KEY) {
Serial.println(key);
}
if (blink){
digitalWrite(ledPin,!digitalRead(ledPin));
delay(100);
}
}
//take care of some special events
void keypadEvent(KeypadEvent key){
switch (keypad.getState()){
case PRESSED:
switch (key){
case ‘#’: digitalWrite(ledPin,!digitalRead(ledPin)); break;
case ‘*’:
digitalWrite(ledPin,!digitalRead(ledPin));
break;
}
break;
case RELEASED:
switch (key){
case ‘*’:
digitalWrite(ledPin,!digitalRead(ledPin));
blink = false;
break;
}
break;
case HOLD:
switch (key){
case ‘*’: blink = true; break;
}
break;
}
}
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