Question

所以当我试图解除系统撤防时遇到问题。当我将代码上传到arduino时，它要求我输入一个引脚然后立即激活系统。但是当我尝试停用系统时，它会占用引脚并清除屏幕并执行我设置的主屏幕功能。

代码如下：

#include "Keypad.h"
#include "LiquidCrystal.h"
#include "Password.h"
LiquidCrystal lcd(0,1,10,11,12,13);
char newPasswordString; //hold the new password
char newPassword[4]; //charater string of newPasswordString

//initialize password to 1234
//you can use password.set(newPassword) to overwrite it
Password password = Password("1234");

byte maxPasswordLength = 4; 
byte currentPasswordLength = 4;
// keypad type definition
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}; //Rows 0 to 3
byte colPins[COLS]= {5,4,3,2}; //Columns 0 to 3
int count=0;     
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup()
{    
  lcd.begin(16, 2);
  mainScreen();
}
void loop(){
   char key = keypad.getKey();
   if (key != NO_KEY){
      delay(60); 
      switch (key){
      case 'A': activate(); break; 
      case 'B': break; 
      case 'C': break; 
      case 'D': deactivate(); break; 
      case '#':  break;
      case '*': break;
      default: processNumberKey(key);
      }
   }
}
void processNumberKey(char key) {
   lcd.print(key);
   currentPasswordLength++;
   password.append(key);
   if(password.evaluate()){
    activate();
   }
}    
void activate() {
   if (password.evaluate()){
      lcd.clear();
      lcd.print("Activated.");
      delay(1000);
      mainScreen();
   } else {
      lcd.clear();
      lcd.print("Wrong Password!");
            mainScreen();    
   } 
}
void deactivate(){
    if (password.evaluate()){
      lcd.clear();
      lcd.print("Deactivated.");
      delay(1000);
   } else {
      lcd.clear();
      lcd.print("Wrong Password!");
      mainScreen();
   } 
}
void mainScreen(){
  lcd.clear();
  lcd.print("Enter Pin:");
  keypad.getKey();
  }

Answer 1

如Arduino keypad 4x4 to LCD activate/deactivate中所述，您必须保持当前状态，并且您必须清除 password和currenPasswordLength。请参阅答案中的WORKING示例。

设置byte currenPasswordLength = 4无济于事。如果按第一个键，它将递增到5，下一个键将其递增到6，依此类推。

256键按下后你会再次获得4分!!!!!!!而且，由于您没有清除以前检查过的密码，您将收到“密码错误”结果（最终堆栈溢出）。

布/解除家庭安全系统arduino键盘液晶显示器

1 个答案: