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[on:]

I don't see any "\" in this sketch.  But Arduino says there is.  What am I doing wrong?

Code:

// Which pins are connected to which LED
 const byte greenLED = 8 ;
 const byte redLED = 10 ;

// Time periods of blinks in milliseconds (1000 milliseconds to a second).
 // Time variable and constants are always unsigned long
 const unsigned long greenLEDinterval = 555UL;
 const unsigned long redLEDinterval = 1234UL;

// Variable holding the timer value so far. One for each “Timer”
 unsigned long greenLEDtimer = 0 ;
 unsigned long redLEDtimer = 0 ;

// Variable to know what the current LED state is
 int greenLEDState = LOW ;
 int redLEDState = LOW ;

void setup() {
 pinMode (greenLED,OUTPUT) ;
 pinMode (redLED,OUTPUT) ;
 greenLEDtimer = millis () ;
 redLEDtimer = millis () ;
 }

void loop() {

if ((millis() – greenLEDtimer) gt= greenLEDinterval) {
 if (greenLEDState == LOW)
 greenLEDState = HIGH ;
 else
 greenLEDState = LOW ;
 // Write new state
 digitalWrite (greenLED, greenLEDState ) ;
 // Reset timer
 greenLEDtimer = millis () ;
 }

// The other LED is controlled the same way. Repeat for more LEDs
if ( (millis () – redLEDtimer) gt= redLEDinterval ) {
 if (redLEDState == LOW)
 redLEDState = HIGH ;
 else
 redLEDState = LOW ;
 digitalWrite (redLED, redLEDState ) ;
 redLEDtimer = millis () ;
 }

[Reply #1 on:]

if ((millis() – greenLEDtimer) gt= greenLEDinterval) {

What's the gt= ...?

[Reply #2 on:]

Code:

if (greenLEDState == LOW)
 greenLEDState = HIGH ;
 else
 greenLEDState = LOW ;

would be only one line of code as

Code:

greenLEDState = !greenLEDState;

[Reply #3 on:]

Your long minuses, -, are becoming unicode and breaking stuff. Replace them with a normal dash/minus. This is what the compiler sees:

Code:

#line 1 "sketch_jun11a.ino"
// Which pins are connected to which LED
 #include "Arduino.h"
void setup();
void loop();
void loop();
#line 1
const byte greenLED = 8 ;
 const byte redLED = 10 ;

// Time periods of blinks in milliseconds (1000 milliseconds to a second).
 // Time variable and constants are always unsigned long
 const unsigned long greenLEDinterval = 555UL;
 const unsigned long redLEDinterval = 1234UL;

// Variable holding the timer value so far. One for each \u201cTimer\u201d
 unsigned long greenLEDtimer = 0 ;
 unsigned long redLEDtimer = 0 ;

// Variable to know what the current LED state is
 int greenLEDState = LOW ;
 int redLEDState = LOW ;

void setup() {
 pinMode (greenLED,OUTPUT) ;
 pinMode (redLED,OUTPUT) ;
 greenLEDtimer = millis () ;
 redLEDtimer = millis () ;
 }

void loop() {

if ((millis() \u2013 greenLEDtimer) gt= greenLEDinterval) {
 if (greenLEDState == LOW)
 greenLEDState = HIGH ;
 else
 greenLEDState = LOW ;
 // Write new state
 digitalWrite (greenLED, greenLEDState ) ;
 // Reset timer
 greenLEDtimer = millis () ;
 }

// The other LED is controlled the same way. Repeat for more LEDs
if ( (millis () \u2013 redLEDtimer) gt= redLEDinterval ) {
 if (redLEDState == LOW)
 redLEDState = HIGH ;
 else
 redLEDState = LOW ;
 digitalWrite (redLED, redLEDState ) ;
 redLEDtimer = millis () ;
 }

[Reply #4 on:]

What's a "long minus" ?

(millis () – redLEDtimer)

Looks normal on my screen.

EDIT: I dropped his code into the IDE and it did break on the "long minus" (and the gt= of course), there's also a missing } at the end.

______
Rob

[Reply #5 on:]

In typesetting there are multiple lengths of dash used for different purposes.

The normal "hyphen" on your keyboard is used as a minus sign.

You then also have the "em dash" and the "en dash" which are both longer than a standard keyboard minus sign.

minus: -
en dash: –
em dash: —

If you use the wrong one in a program it throws a wobbly.

[Reply #6 on:]

I see, I'm familiar with them because I've done a lot of desk top publishing, but how on earth did they wind up in a program, did he write it in a word processor instead of a text editor?

______
Rob

[Reply #7 on:]

but how on earth did they wind up in a program

Probably cut-and-pasted from a web site.

[Reply #8 on:]

Thanks guys, i got it to compile.