首页 › Arduino › 发一个4X4的键盘查询

lqh 发表于 2016-1-8 10:39:04

发一个4X4的键盘查询

const int numRows=4;
const int numCols=4;
const int debounceTime=20;//
const char keymap={//按键面板排列
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};


const int rowPins={3,4,5,6};
const int colPins={7,8,9,10};


void setup()
{
Serial.begin(9600);
for (int row=0;row<numRows;row++)
   {
   pinMode(rowPins,INPUT);
   digitalWrite(rowPins,HIGH);
    }
   
    for (int col=0;col<numCols;col++)
   {
   pinMode(colPins,OUTPUT);
   digitalWrite(colPins,HIGH);
    }
}

void loop()
{
char key=getkey();
if(key!='X')
   {
      Serial.print("Got key:");
      Serial.println(key);
    }
}


char getkey()
{
char key='X';

   for (int col=0;col<numCols;col++)
   {
      digitalWrite(colPins,LOW);   

for (int row=0;row<numRows;row++)
   {
   if(digitalRead(rowPins)==LOW)
       {
         delay(debounceTime);
         while(digitalRead(rowPins)==LOW);
         key=keymap;

      }

    }
   
digitalWrite(colPins,HIGH);

}
return key;
}

maxims 发表于 2016-1-8 14:00:42

好分享~谢谢了。

lqh 发表于 2016-4-19 07:43:40

本帖最后由 lqh 于 2016-5-2 12:07 编辑

做一个小试验Si?KWA51#

bg1ebu 发表于 2016-7-25 21:12:40

Si?b做一个小试验Si?KWA51#

zwf470 发表于 2016-12-28 23:47:15

谢谢楼主无私奉献仿制了一个带I2C的1602程序


#include <Keypad.h>
//LingShun lab
#include <Wire.h>   
#include <LiquidCrystal_I2C.h> //引用I2C库

//设置LCD1602设备地址，这里的地址是0x3F，一般是0x20，或者0x27，具体看模块手册
LiquidCrystal_I2C lcd(0x3F,16,2);   




const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup(){
lcd.init();                  // 初始化LCD
lcd.backlight();             //设置LCD背景等亮
Serial.begin(9600);
}
   
void loop(){
char customKey = customKeypad.getKey();
   
if (customKey){
    Serial.println(customKey);
    lcd.setCursor(0,0);                //设置显示指针
lcd.print(customKey);   //输出字符到LCD1602上
lcd.setCursor(9,1);
lcd.print(" Z.W.F.");
   
   
   
}
}

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