矩阵键盘密码能否用变量代替，实现在线更改密码~~

万马奔腾

Password password = Password( "1234" );
以上是例程里面的代码，密码是事先设定好了的
我想将上述密码设置成一个变量，可以在线更改密码
String comdata = "1234";
Password password = Password(comdata);
这个代码编译不能通过，求高人~~~~就是矩阵键盘的密码怎么用变量赋值？

smching

用password.set(newPassword);

请参考
http://ediy.com.my/index.php/tutorials/item/69-password-access-with-arduino-using-keypad

1. #include <Keypad.h>
   
2. #include <Password.h>
   
3. 
   
4. String newPasswordString; //hold the new password
   
5. char newPassword[6]; //charater string of newPasswordString
   
6. 
   
7. //initialize password to 1234
   
8. //you can use password.set(newPassword) to overwrite it
   
9. Password password = Password( "1234" );
   
10. 
    
11. byte maxPasswordLength = 6;
    
12. byte currentPasswordLength = 0;
    
13. const byte ROWS = 4; // Four rows
    
14. const byte COLS = 4; // Four columns
    
15. 
    
16. //Define the keymap
    
17. char keys[ROWS][COLS] = {
    
18. {'1','2','3','A'},
    
19. {'4','5','6','B'},
    
20. {'7','8','9','C'},
    
21. {'*','0','#','D'}
    
22. };
    
23. 
    
24. //// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
    
25. byte rowPins[ROWS] = {6,7,8,9}; //connect to row pinouts
    
26. 
    
27. // Connect keypad COL0, COL1, COL2 and COL3 to these Arduino pins.
    
28. byte colPins[COLS] = {2,3,4,5}; //connect to column pinouts
    
29. 
    
30. // Create the Keypad
    
31. Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
    
32. 
    
33. void setup(){
    
34.    Serial.begin(9600);
    
35. }
    
36. 
    
37. void loop(){
    
38.    char key = keypad.getKey();
    
39.    if (key != NO_KEY){
    
40.       delay(60);
    
41.       switch (key){
    
42.       case 'A': break;
    
43.       case 'B': break;
    
44.       case 'C': break;
    
45.       case 'D': changePassword(); break;
    
46.       case '#': checkPassword(); break;
    
47.       case '*': resetPassword(); break;
    
48.       default: processNumberKey(key);
    
49.       }
    
50.    }
    
51. }
    
52. 
    
53. void processNumberKey(char key) {
    
54.    Serial.print(key);
    
55.    currentPasswordLength++;
    
56.    password.append(key);
    
57.    if (currentPasswordLength == maxPasswordLength) {
    
58.       checkPassword();
    
59.    }
    
60. }
    
61. 
    
62. void checkPassword() {
    
63.    if (password.evaluate()){
    
64.       Serial.println(" OK.");
    
65.    } else {
    
66.       Serial.println(" Wrong passwowrd!");
    
67.    }
    
68.    resetPassword();
    
69. }
    
70. 
    
71. void resetPassword() {
    
72.    password.reset();
    
73.    currentPasswordLength = 0;
    
74. }
    
75. 
    
76. void changePassword() {
    
77.    newPasswordString = "123";
    
78.    newPasswordString.toCharArray(newPassword, newPasswordString.length()+1); //convert string to char array
    
79. password.set(newPassword);
    
80.    resetPassword();
    
81.    Serial.print("Password changed to ");
    
82.    Serial.println(newPasswordString);
    
83. }
    
84. 
    
85. void resetPassword() {
    
86.    //do something to resetPassword
    
87. }

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