loop isolation

Projects Programming
1

I just started to learn how to code and I use an lcd shield on my Arduino.

What I've tried to do is making a timer where each second appear on the LCD...

#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {

lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print("LED CountDown :");

}

void loop() {

 lcd.setCursor(0, 2);
 lcd.print(millis()/1000);
}

...while making an LED blink ON for 4sec and OFF for 7sec in a loop.

void setup() {

pinMode(2, OUTPUT);

lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print("LED CountDown :");

}

void loop() {

digitalWrite(2, HIGH);
delay(4000);
digitalWrite(2, LOW);
delay(7000);

}

I tried to isolate the delay fonction with While loop but it's still affecting the LCD by applying to it the delay assigned for the blink of the LED.

#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {

pinMode(2, OUTPUT);

lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print("LED CountDown :");

}

void loop() {

 lcd.setCursor(0, 2);
 lcd.print(millis()/1000);

 int var = 0;
 while(var < 1){
digitalWrite(2, HIGH);
delay(4000);
digitalWrite(2, LOW);
delay(7000);
 var++;
 }
}

I search a lot but I didn't find anything to isolate a loop.

2

Hello and welcome,

Look the Blink Without Delay example for a non blocking method. Also look this post.

3

First, please modify your post and get rid of that awefull color that makes it hard to read. Then use code tags to post your code (the </> button).

Like guix stated, look at the Blink without delay example in the IDE.

4

Thanks a lot you very much for your help Guix!

5

Have a look at the demo Several Things at a Time

Please modify your post and use the code button </> so your code looks like this and is easy to copy to a text editor. See How to use the Forum

...R