system
December 13, 2012, 2:43pm
1
Me and my friend don't know how to fix this error, or why it's accouring.
Our code looks like this:
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup() {
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop(){
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(hl, LOW);
}
else {
// turn LED off:
digitalWrite(hl, HIGH);
}
}
{
digitalWrite(hl, HIGH)
delay(1000);
digitalWrite(hl, low)
delay(1000)
}
When we try to verify it, we get the error:
Button:57: error: expected unqualified-id before '{' token
Please tell us how to fix the problem!!
guix
December 13, 2012, 2:49pm
2
Hello and welcome
You have few problems on the last lines:
Here is your code, exactly the same but correctly indented:
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup()
{
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH)
{
// turn LED on:
digitalWrite(hl, LOW);
}
else
{
// turn LED off:
digitalWrite(hl, HIGH);
}
}
{
digitalWrite(hl, HIGH)
delay(1000);
digitalWrite(hl, low)
delay(1000)
}
See the problem(s) ??
system
January 5, 2013, 6:14pm
4
Me and my friend don't know how to fix this error, or why it's accouring (we have very little experience with programming).
Our code looks like this:
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup() {
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop(){
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(hl, LOW);
}
else {
// turn LED off:
digitalWrite(hl, HIGH);
}
}
{
digitalWrite(hl, HIGH);
delay(1000);
digitalWrite(hl, LOW);
delay(1000);
}
When we try to verify it, we get the error:
Button:57: error: expected unqualified-id before '{' token
Please tell us how to fix the problem!!
You must have an equal number of braces both { and }.
The braces must enclose blocks of code.
The braces in that code are all over the place.
I imagine that this is what you want, but I am not sure.
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup() {
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop(){
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(hl, LOW);
}
else {
// turn LED off:
digitalWrite(hl, HIGH);
}
digitalWrite(hl, HIGH);
delay(1000);
digitalWrite(hl, LOW);
delay(1000);
}
First, if you post please use the # button to tag code correctly
Give this a try, I removed a { and added an extra delay(200) , .. (code not tested)
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup()
{
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH)
{
digitalWrite(hl, LOW);
}
else
{
digitalWrite(hl, HIGH);
}
delay(200); // extra
digitalWrite(hl, HIGH);
delay(1000);
digitalWrite(hl, LOW);
delay(1000);
}
Problem 1 - all the statements should end with a semi-colon like this
digitalWrite(hl, HIGH);
Are there any lines in your sketch that don't ?
Problem 2 - when, if ever, is this code going to be executed ?
{
digitalWrite(hl, HIGH)
delay(1000);
digitalWrite(hl, low)
delay(1000)
}
system
January 5, 2013, 6:35pm
9
robtillaart:
First, if you post please use the # button to tag code correctly
Give this a try, I removed a { and added an extra delay(200) , .. (code not tested)
const int buttonPin = 2;
const int hl = 3;
int buttonState = 0;
void setup()
{
pinMode(hl, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH)
{
digitalWrite(hl, LOW);
}
else
{
digitalWrite(hl, HIGH);
}
delay(200); // extra
digitalWrite(hl, HIGH);
delay(1000);
digitalWrite(hl, LOW);
delay(1000);
}
Hi, it worked, thanks, but why did you make an extra delay, and why did it work???
Please don't cross post. Threads merged.
Hi, it worked, thanks, but why did you make an extra delay, and why did it work???
That is your homework:)
Follow the code by hand, read it carefully line by line.
Be the Arduino !
and do what the code says and you will understand.