LED Blinking Using Push button

Question

Whenever I upload the following program I am getting error message showing "expected initializer before interval".

Kindly Help me to solve out this probleme.

const byte button=2;
const byte LED=10;
bool blinking =false;//defines when blinking should occur
unsigned long blink Interval=250;// number of milliseconds for blink
unsigned long currentMillis;// variables to track millis()
unsigned long previousMillis;
void setup()
{
 pinMode(button,INPUT);
 pinMode(LED,OUTPUT);
}
void loop()
{
 // this code blinks the LED
 if(blinking) {
 currentMillis =millis();// better to store in variable, for less jitter
 if((unsignedlong)(currentMillis-previousMillis) >=blinkInterval) { // enough time passed yet?
 digitalWrite(LED,!digitalRead(LED)); // shortcut to toggle the LED
 previousMillis =currentMillis;// sets the time we wait "from"
 }
 } else {
 digitalWrite(LED,LOW); // force LED off when not blinking
 }
 int reading=digitalRead(button);
 delay(50); // crude de-bouncing
 if(reading==LOW) // buttons with pull-up are pressed when LOW
 { blinking =true; }// start blinking
 else
 { blinking =false; }// stop blinking
}

Answer 1

It is blinkInterval, not blink Interval. You have an space in the name in the declaration:

unsigned long blinkInterval=250; // number of milliseconds for blink
// ....
if((unsigned long)(currentMillis-previousMillis) >= blinkInterval) { 

• user31481: @Josephazim. That's not a problem; that's your code. When button goes HIGH, you put blinking=false. You have to introduce a waiting time there, but that is a new problem.
• Josephazim: Thanks!It worked as you suggest but now my problem is that when I keep holding the button led is blinking and when I release the button it stop.I want it to be when I hold the push button for 5 sec, then led should start blinking for 10 minute or according to the certain time.Kindly help me to solve this problem.
• Hasan: @Josephazim Check out my answer. It will helpful for you.
• Hasan: @NickGammon I think you have to check this comment section. I answered according to that problem.

Answer 2

The fully working sketch

const byte button=2; 
const byte LED=10; 
bool blinking =false;
unsigned long blinkInterval=250; 
unsigned long currentMillis; 
unsigned long previousMillis; 
void setup()
{
 pinMode(button,INPUT);
 pinMode(LED,OUTPUT);
}
void loop()
{
 if(blinking) {
 currentMillis =millis();
 unsigned long blinkInterval=100;
 if((unsigned long)(currentMillis-previousMillis) >= blinkInterval) { 
 digitalWrite(LED,!digitalRead(LED)); LED
 previousMillis =currentMillis;
 }
 } else {
 digitalWrite(LED,LOW); 
 }
 int reading=digitalRead(button);
 delay(100); 
 if(reading==LOW) 
 { blinking =true; }
 else
 { blinking =false; }
}