how to end void loop temporarily without pressing arduino reset button

hahala1993 · March 13, 2016, 2:05pm

my program is like this
when there is light motor pulling up curtain
when there is no light,motor pulling down curtain
after i press interrupt, user pull the curtain manually with 2 interrupt button(pulling up or down)
after interrupt it will jump back to void loop continously,motor rotate automatically
it doest not make any sense if after interrupt jump back to void loop...
no point to press the interrupt if jump back to void loop
i need a button to control on/off the void loop...

dorvakta · March 13, 2016, 2:24pm

Make a button that toggles a flag. And make an make the code do nothing while the flag is high.

hahala1993 · March 13, 2016, 2:28pm

can u explain the code to me? please..im still new to c...

dorvakta · March 13, 2016, 2:39pm

Well, i'm writing this on my phone, but i'll give you this pseudo code.

Bool flag = FALSE;

void do_nothing()
{
Serial.print("pause");
}

Void loop()
{
/*your ordinary code goes here*/

If (button pressed)
{
Flag = !flag;
}

While (flag == true)
{
Do_nothing()
}

}

Hopefully this will give you an idea

hahala1993 · March 13, 2016, 2:48pm

#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5 , 4, 3, 2);

int LDR=22;
int IN1 = 52;
int IN2 = 50;
int IN3 = 48;
int IN4 = 46;
int _step = 0;
int button=31;
boolean flag = false;

boolean dir = true;// gre
void anticlockwise()
{
switch(_step){
case 0:
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN4, LOW);

break;
case 1:
digitalWrite(IN1, HIGH);
digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN4, HIGH);
break;
case 2:
digitalWrite(IN1, HIGH);
digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN4, LOW);
break;
case 3:
digitalWrite(IN1, HIGH);
digitalWrite(IN2, HIGH);
digitalWrite(IN3, LOW);
digitalWrite(IN4, LOW);
break;
case 4:
digitalWrite(IN1, LOW);
digitalWrite(IN2, HIGH);
digitalWrite(IN3, LOW);
digitalWrite(IN4, LOW);
break;
case 5:
digitalWrite(IN1, LOW);
digitalWrite(IN2, HIGH);
digitalWrite(IN3, HIGH);
digitalWrite(IN4, LOW);
break;
case 6:
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN3, HIGH);
digitalWrite(IN4, LOW);
break;
case 7:
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN3, HIGH);
digitalWrite(IN4, HIGH);
break;
default:
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN4, HIGH);
break;
}

if(dir){
_step++;
}else{
_step--;
}
if(_step>7){
_step=0;
}
if(_step<0){
_step=7;
}

delay(1);

}

void clockwise()
{

switch(_step){
case 0:
digitalWrite(IN4, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN1, LOW);

break;
case 1:
digitalWrite(IN4, HIGH);
digitalWrite(IN3, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN1, HIGH);
break;
case 2:
digitalWrite(IN4, HIGH);
digitalWrite(IN3, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN1, LOW);
break;
case 3:
digitalWrite(IN4, HIGH);
digitalWrite(IN3, HIGH);
digitalWrite(IN2, LOW);
digitalWrite(IN1, LOW);
break;
case 4:
digitalWrite(IN4, LOW);
digitalWrite(IN3, HIGH);
digitalWrite(IN2, LOW);
digitalWrite(IN1, LOW);
break;
case 5:
digitalWrite(IN4, LOW);
digitalWrite(IN3, HIGH);
digitalWrite(IN2, HIGH);
digitalWrite(IN1, LOW);
break;
case 6:
digitalWrite(IN4, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN2, HIGH);
digitalWrite(IN1, LOW);
break;
case 7:
digitalWrite(IN4, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN2, HIGH);
digitalWrite(IN1, HIGH);
break;
default:
digitalWrite(IN4, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN1, HIGH);
break;
}

if(dir){
_step++;
}else{
_step--;
}
if(_step>7){
_step=0;
}
if(_step<0){
_step=7;
}

delay(1);

}
void do_nothing()
{
Serial.print("pause");
}

void setup()
{

pinMode(IN1, OUTPUT);
pinMode(IN2, OUTPUT);
pinMode(IN3, OUTPUT);
pinMode(IN4,OUTPUT);

Serial.begin(9600);

button = 31; //whatever pin your button is plugged into
pinMode(button, INPUT);
attachInterrupt(digitalPinToInterrupt(18),clockwise_manual,LOW);
attachInterrupt(digitalPinToInterrupt(19),anticlockwise_manual,LOW);
lcd.begin(16,2);
lcd.print("System on!");

}

void loop()
{

int LDRstate=digitalRead(LDR);

if(LDRstate==LOW)

{
anticlockwise;
}

if(LDRstate==HIGH)
{

clockwise();
}

if (button==HIGH)
{
flag= !flag;
}

while (flag == true)
{
do_nothing();
}

}

void clockwise_manual()
{
anticlockwise();
}
void anticlockwise_manual()
{
clockwise();

}

hahala1993 · March 13, 2016, 2:54pm

it doesnot work....

system · March 13, 2016, 3:01pm

hahala1993:
it doesnot work....

What does that mean?

(Code tags. Mmmm yeah, we love code tags)

hahala1993 · March 13, 2016, 3:05pm

i mean what dorvakta taught me just now....still cnt control the void loop... bro... any solution?

system · March 13, 2016, 3:06pm

 if(LDRstate==LOW)

{
 anticlockwise;
}

What's that?

"bro"?

system · March 13, 2016, 3:08pm

 button = 31;

if (button==HIGH)

Doesn't seem likely, does it?

sterretje · March 13, 2016, 3:09pm

Please edit your post and use code tags

[code] your code here [/code]

will result in

your code here

Also, please be more clear with regards to 'it does not work'. I guess it blew up your Arduino? Or something else?

hahala1993 · March 13, 2016, 3:14pm

LDR is my light sensor(digital output)
when it become 0.. then my motor turn by anticlockwise

button=31;// my digital pin on arduino mega 2560.

if(button==HIGH) // im already try it if(button==LOW) ....but still cnt solve my problem...

system · March 13, 2016, 3:16pm

LDR is my light sensor(digital output)
when it become 0.. then my motor turn by anticlockwise

But that's only if you call the function "anticlockwise", something you're not doing there, which is why I asked the question.

"HIGH" has the value 1 and "LOW" has the value 0. Neither is ever going to be equal to 31.
You need to read the condition present on pin 31 and comape that to HIGH or LOW.

hahala1993 · March 13, 2016, 3:20pm

im already mention pin31 as input...
yup....i call the function if my LDR goes to LOW
is it related to how to control the void loop by pressing button?

system · March 13, 2016, 3:22pm

im already mention pin31 as input...

But you have to read it.

yup....i call the function if my LDR goes to LOW

Not in the code you posted you don't, which is why I pointed it out.

Hutkikz · March 13, 2016, 3:25pm

Use code tags as mentioned and don't cross-post.

Using a button does not need a interrupt.

Here is a button Handling code:

const byte button = 2;   // button connected: pin->button->ground

void setup()
{
  pinMode (button, INPUT_PULLUP); // enable internal pull up resistor
}

void loop()
{
  byte buttonState = buttonCheck();   // checks button
  if (buttonState == 1)
  {
    // button has been pressed
    // Do stuff here
  }
}

byte buttonCheck()   // Return positive Once per button press
{
  static int isButtonPressed;
  static byte buttonHasBeenPressed;

  if (digitalRead(button) == LOW)       // Read button on pin 2
  {
    isButtonPressed++;            // Increment Debounce variable
  }
  else
  {
    isButtonPressed = 0;          // Reset if it bounced
    buttonHasBeenPressed = 0;     // reset to 0 if button is released
  }

  if (isButtonPressed == 10 && buttonHasBeenPressed == 0)       // Debounce Confirmed Threshold
  {
    buttonHasBeenPressed = 1;     // indicates that button has been pressed
    return 1;                     // Button Pressed
  }
  else
  {
    return 0;                     // Button Not Pressed
  }
}

hahala1993 · March 13, 2016, 3:26pm

 Serial.begin(9600);  
 
 button = 31; //whatever pin your button is plugged into
  pinMode(button, INPUT);

...i already declared it as input...

system · March 13, 2016, 3:28pm

...i already declared it as input...

But you're not reading it

hahala1993 · March 13, 2016, 3:32pm

my program already can work with the hardware...
now my problem just want to know how to on/off the void loop by pressing button..

system · March 13, 2016, 3:37pm

OK, post your corrected code, in code tags (very important).

Tell us what it doesn't do that you expect it to do, and also tell us what it does do that you don't expect.

Topic		Replies	Views
Help to control the number of times the "loop" is implemented Programming	7	135	February 10, 2026
Breaking out of attachInterrupt void during countdown General Guidance	38	173	January 3, 2026
Help with loop function Programming	26	216	August 8, 2025
Arduino should act as a Push Button when the loop is done Programming	19	360	April 20, 2024
Problem with toggling on off with momentary button Programming	36	542	September 22, 2024

how to end void loop temporarily without pressing arduino reset button

Related topics