arduino compile error

Projects Programming
1

hey i m new to this site......
actually m makin a line follower robot based on d PID algorithm....
m gettin a few compile errors

pid_n_linefollower:78: error: stray '' in program
pid_n_linefollower:83: error: stray '' in program
pid_n_linefollower:86: error: stray '' in program
pid_n_linefollower:-1: error: expected initializer before 'current_position'
pid_n_linefollower:17: error: expected initializer before 'current_position'

ive attached d code ...
plz hlp me
thnxx in advance...... :slight_smile:

pid_n_linefollower.ino (1.67 KB)

2

Well, I see funky characters like this:
unsigned int Error = target_pos – current_pos;

so that is probably the problem. Whatever that is, it is not a C operator.

3 
unsigned int RPM of Left motor = pwm – (Correction);
unsigned int   RPM of Right motor = pwm + (Correction);

You can't have spaces in variable names.

 calculate current_position ();

What is this supposed to be/do?

if (error==0)
  {
   analogWrite (RPM of Left motor,3) && analogWrite (RPM of Right motor,5)
  }
  if (error < 0)                                                      // line follower algorithm
  {
    analogWrite (RPM of Left motor,3); 
  }
  
  if (error > 0)
  {
    analogWrite (RPM of Right motor,5); 
  }
}

Putting the arguments in the correct order is useful, too.

4

thnxx 4 d reply .......
ive jus started with c and arduino n m nt a skilled c programmer.... :frowning:
bt m learnin frm u ppl thnxx a lot
Code:
calculate current_position ();
What is this supposed to be/do?
itz to calculate the current position of d robot in respect to d line.....

5

Is there something wrong with your vowel keys?
Your last post was hopelessly garbled.

6

what are those expected initializers before....???
and stray '' in program

7

It's usually not very helpful to chase down every error the compiler produces - if you fix the first one, others will often vanish too. PaulS has pointed out a number of issues which you would be well advised to fix first. If you still have compiler issues then, post your amended code and the new error messages

8

if you fix the first one, others will often vanish too

I'll second that.... so often the case

9 
analogWrite (RPM of Left motor,3) && analogWrite (RPM of Right motor,5)

Ignoring, for a moment, the spaces in the variable names, analogWrite doesn't return a value, so putting two in an expression like that doesn't make a lot of sense.

10

@ AWOL

[analogWrite (RPM of Left motor,3) && analogWrite (RPM of Right motor,5)]

that was a mistake by me sry  :blush: .........
bt ill try to fix d errors pointed by paulS
11

sry 4 d typing errors in d forum .....
bcoz m vry new to this forum

12

O K Doe Kay

13

Are you very new to typing?

You aren't composing a text message, so don't type like it.

14

OK