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Topic: Help w/ Project 2 - Spaceship Interface Code (Read 4479 times) previous topic - next topic


Mar 08, 2013, 08:11 pm Last Edit: Mar 08, 2013, 08:19 pm by CharF Reason: 1
I'm starting the second project and get the response "void setup()" as an error.  I've written all the code as it is (or as I think it is) in the book, but something is wrong.  "void setup()" is the error I get when I include the text from the top shaded box on page 37 of book:

void setup () {

void loop () {

When I delete the text from the top shaded box on page 37, I get this error instead: "switchState" was not declared in this scope.
I considered starting with code in the second shaded box because it has a "1" next to the first line... my thinking is this should be the first line of code.  Still, no-worky.

With this error, "switchState" was not declared in this scope, the following line is highlighted in yellow: if (switchState == LOW) {

How do I get this code to work?  The on-line videos of the code for this project at RS look different than what's in the book, but I've got the book and want to use it for instruction.  Thanks.


Problem is solved.

If anyone has the same problem, I found code for this project by clicking A) Arduino icon, B) File, C) Examples, D) 10.StarterKit, and then E) p02_SpaceshipInterface

Uploading this sketch made made project #2 work.  It looks like the codes for all projects are listed here, and don't have to be typed by the user.

Good luck with your projects!

I had the same problem. When i changed the name of the variable from "switchState" to "switchstate" everything worked fine.

it gave me a different issue i wrote the code from the book like this:
int switchState = 0;
void setup() {
  pinMode (3,OUTPUT);
  pinMode (4,OUTPUT);
  pinMode (5,OUTPUT);
  pinMode (2,INPUT);


void loop(){
  switchState = digitalRead(2);
  // this is a comment
  if (switchState == LOW);{
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    digitalWrite(5, HIGH);
    delay(250);//wait for a quarter second
    //toggle the LEDs
    digitalWrite (4, HIGH);
    digitalWrite (5, LOW);

and it gave error compiling stating "else without previous if" ???????


Hi rcarver445,

If you look closely, I believe your problem is with a misplaced semicolon on the line with your if statement:
    if (switchState == LOW);{
should be
    if (switchState == LOW) {

I hope this helps!

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