Actions
Forum Thread Details
  • Replies 9 replies
  • Subscribers 394 subscribers
  • Views 2262 views
  • Users 0 members are here
Related

Arduino project 7 Keyboard code

Former Member

Hi All

 

I put together the 7th project in the Arduino project book and unfortunately i cannot get the code to compile, this is the trouble some code:

 

int buttons[6];

int buttons[0] = 2;

 

that's how its written in the book, when i try to verify the code i get this error

 

project_7_keyboard:3: error: conflicting declaration 'int buttons [0]'

project_7_keyboard:1: error: 'buttons' has a previous declaration as 'int buttons [6]'

 

now I can see that the compiler thinks I am trying to declare 2 separate int variables as buttons, but the book teaches that this is how you assign value to the first element of the array.

 

can i please have some advice.

 

Thanks

 

Erny

Parents

  • I would not consider myself an expert, but the book must be wrong.

    If those two statements exist in the same program, then yes you are attempting to declare the variable buttons twice.

     

    The first statement declares an array of 6 integers.

    In the second statement, you want to assign the value 2 to the first element (index 0) of the array.

    The inclusion of the "int" before the assignment causes the problem.

    If you remove the "int" then the statement becomes an assignment statement, instead of a declaration statement.

     

    I hope this helps.

    Larry

  • in reply to Former Member

    Hi Larry

     

    thanks for the response, I had a feeling it didn't look correct. also i tried to remove the int from buttons[0] = 2 and i still get an error. this time it tells me it was expecting something before the '='. i would copy and paste the error but i'm currently at work so it would have to wait till i get home.

     

    but if you know what im doing wrong please let me know.

     

    Thanks

     

    Erny

  • in reply to Former Member

    Erny

    There is a discussion here Project 07 Keyboard Instrument - Arduino Forum about it.

     

    You do need to drop the int, as you have already defined buttons as a 7 element array (0-6)

    Just make sure the buttons[0] is a zero not a Ohh by mistake.

     

    Mark

     

    edit: array should be 7 elements 0-6 ....Mark

  • in reply to Former Member

    i'm sorry, but I got the same problem with this 2  fuc**** lines,  and I tried what you have all said (sorry my english isn't very good i'm french. I hope you understand) but it still doesn't work, here is my code:

     

     

    int buttons[6];

    int buttons[0] = 2;

    int notes[] = {262, 294, 330, 349};

    void setup() {

      Serial.begin(9600);

    }

    void loop () {

      int keyVal = analogRead(A0);

      Serial.println(keyVal);

    if (keyVal == 1023){

        tone(8, notes[0]);

      }

      else if (keyVal >= 990 && keyVal <= 1010) {

        tone(8, notes[1]);

      }

      else if(keyVal >= 505 && keyVal <= 515) {

        tone(8, notes[2]);

      }

      else if(keyVal >= 5 && keyVal <= 10) {

        tone(8, notes[3]);

      }

      else{

        noTone(8);

      }

    }

    ive tried tu cut the "int" on the second line, but like erny, it tells me " expected constructor, destructor, or type conversion before '=' token"

    i've made sure that my 0  isn't an o, and it still doesn't work.

    please help me

Reply
  • in reply to Former Member

    i'm sorry, but I got the same problem with this 2  fuc**** lines,  and I tried what you have all said (sorry my english isn't very good i'm french. I hope you understand) but it still doesn't work, here is my code:

     

     

    int buttons[6];

    int buttons[0] = 2;

    int notes[] = {262, 294, 330, 349};

    void setup() {

      Serial.begin(9600);

    }

    void loop () {

      int keyVal = analogRead(A0);

      Serial.println(keyVal);

    if (keyVal == 1023){

        tone(8, notes[0]);

      }

      else if (keyVal >= 990 && keyVal <= 1010) {

        tone(8, notes[1]);

      }

      else if(keyVal >= 505 && keyVal <= 515) {

        tone(8, notes[2]);

      }

      else if(keyVal >= 5 && keyVal <= 10) {

        tone(8, notes[3]);

      }

      else{

        noTone(8);

      }

    }

    ive tried tu cut the "int" on the second line, but like erny, it tells me " expected constructor, destructor, or type conversion before '=' token"

    i've made sure that my 0  isn't an o, and it still doesn't work.

    please help me

Children