arduino compile error

Using Arduino Programming Questions
#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.... :( 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

#15