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Author Topic: [HELP] Running 2 programs at once.  (Read 1710 times)
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Philippines
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I just got the arduino, and basically, i'm going to make a program that controls a servo independently with a set or instructions, and reads values from a temperature sensor independently and does another action when a certain value is reached.

I'm planning to do this with one arduino, is this possible?
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Sure. You just have to make sure your main loop doesn't wait for anything -- essentially, no while loops.
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Will the delay command have any effect?
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I don't think you connected the grounds, Dave.
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It may well do.
But we can't see your code.
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You might find this page helpful:
http://www.gammon.com.au/forum/?id=11425

especially look for the post on state machines.



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I find it harder to express logic in English than in Code.
Sometimes an example says more than many times as many words.

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Quote
Will the delay command have any effect?
Quote
It may well do.
I think you misspelled "Most definitely!".
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Will the delay command have any effect?

It will delay execution.
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Philippines
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thanks for your replies.

Let's say that I want to control 2 LEDs independently, with different pin connections and effects.

WizenedEE mentioned something about the code being in the main loop. How do I make 2 independent loops?

I've given values for the pinouts for the second LED, so where do I put it in the code for an independent operation?

I got this code from the examples library in the Arduino software, and I added the new pinout on the second line of the code.

Regarding the delay, how do I program it without affecting eachother?

Code:
int led = 13;
int led0 = 9;

void setup() {                
  pinMode(led, OUTPUT);  
  pinMode(led0, OUTPUT);
}

void loop() {
  digitalWrite(led, HIGH);  
  delay(1000);              
  digitalWrite(led, LOW);    
  delay(1000);              
}
« Last Edit: July 11, 2012, 11:50:18 pm by Gin319 » Logged

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WizenedEE mentioned something about the code being in the main loop. How do I make 2 independent loops?
You don't. You need to make your code work together within a single loop.
Quote
Regarding the delay, how do I program it without affecting eachother?
Look at the Blink Without Delay example.
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Let's say that I want to control 2 LEDs independently, with different pin connections and effects.

http://www.gammon.com.au/blink
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Philippines
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Let's say that I want to control 2 LEDs independently, with different pin connections and effects.

http://www.gammon.com.au/blink


Thanks for the link. I kinda understand how it works. Now let's say that I wanted to take temperature readings and then control a servo motor independently.

Using this code that I got from your link, can you please give me an idea on how to place it in this code?

Thanks.

Code:

// Which pins are connected to which LED
const byte greenLED = 12;
const byte redLED = 13;

// Time periods of blinks in milliseconds (1000 to a second).
const unsigned long greenLEDinterval = 500;
const unsigned long redLEDinterval = 1000;

// Variable holding the timer value so far. One for each "Timer"
unsigned long greenLEDtimer;
unsigned long redLEDtimer;

void setup ()
  {
  pinMode (greenLED, OUTPUT);
  pinMode (redLED, OUTPUT);
  greenLEDtimer = millis ();
  redLEDtimer = millis ();
  }  // end of setup

void toggleGreenLED ()
  {
   if (digitalRead (greenLED) == LOW)
      digitalWrite (greenLED, HIGH);
   else
      digitalWrite (greenLED, LOW);

  // remember when we toggled it
  greenLEDtimer = millis (); 
  }  // end of toggleGreenLED

void toggleRedLED ()
  {
   if (digitalRead (redLED) == LOW)
      digitalWrite (redLED, HIGH);
   else
      digitalWrite (redLED, LOW);

  // remember when we toggled it
  redLEDtimer = millis (); 
  }  // end of toggleRedLED

void loop ()
  {

  // Handling the blink of one LED.
  if ( (millis () - greenLEDtimer) >= greenLEDinterval)
     toggleGreenLED ();

  // The other LED is controlled the same way. Repeat for more LEDs
  if ( (millis () - redLEDtimer) >= redLEDinterval)
    toggleRedLED ();

/* Other code that needs to execute goes here.
   It will be called many thousand times per second because the above code
   does not wait for the LED blink interval to finish. */

}  // end of loop



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Code:
void setup{
i=0;
s=0;
r=0;}

void loop {
if ( i % 5 == 0 )
   {  s=1-s;
      if (s<0){digitalwrite (relight,HIGH); } else {digitalwrite (redlight,LOW)};   // define redlight pin in setup
                   }
if ( i % 100 == 0 )
 {  r=1-r;
    if (r<0){digitalwrite (greenlight,HIGH); } else {digitalwrite (greenlight,LOW)};   // define greenlight pin in setup
                  }
//delay below
//..
}

for sure this programs runs to fast to see redlight blink you add delay or use higer numeber after the %    .. i % 5000


just another way of doing it, based on modulo calculation



 
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Using this code that I got from your link, can you please give me an idea on how to place it in this code?
Quote

BIG Clue here:
Code:
/* Other code that needs to execute goes here.
   It will be called many thousand times per second because the above code
   does not wait for the LED blink interval to finish. */

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Quote
Now let's say that I wanted to take temperature readings and then control a servo motor independently.
What does this mean. You have one computer and two jobs. How can you expect to do them independently? Doing one right after the other (read the temps; diddle with the servo; read the temps; diddle with the servo) makes sense. Doing the two tasks independently requires two Arduinos. Help me understand what independently means to you.
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Maybe thermometer and servo are the independent parts?

Gin, loop() is your friend. Every time through can be 100 microseconds or less later, if your code doesn't hang things up. Inside loop() you can have a block of code that watches the sensor and the next block of code runs the servo. Each runs then loop() starts again and loop() is perpetually 'now'... but only if your code doesn't block.
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I find it harder to express logic in English than in Code.
Sometimes an example says more than many times as many words.

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