Arduino - How to multithread this application

Question

I'm writing a garage door opener and monitor.

The monitor receives the door status via another Arduino over RF (315 MHz). The code below works, but I feel that I shouldn't need to check the status every time I make a request to the server to open the door. Is there a way to split the code out so that I check the door status every 20 seconds, and the opening and closing of the garage are on demand?

Here is the code: https://github.com/dhysong/ArduinoGarageOpener/blob/master/src/GarageDoorOpener/GarageDoorOpener.ino

2 down votes with now comment. Does no one else think this might be a valid question? I guess I must have offended the SO gods! — dhysong
– dhysong, Commented Sep 30, 2012 at 18:51
I don't understand, I am the author. I didn't downvote my own post. — dhysong
– dhysong, Commented Sep 30, 2012 at 19:05
Oups, my bad, I didn't notice that! I didn't vote down your post, though... — Alexandre Vinçon
– Alexandre Vinçon, Commented Sep 30, 2012 at 19:13
You might be better off posting to the arduino forums (arduino.cc/forum). That community is huge + very friendly. — spring
– spring, Commented Oct 2, 2012 at 0:04

dhysong · Accepted Answer · 2012-10-01 23:52:21Z

2

Based on this post: http://arduino.cc/forum/index.php/topic,5686.0.html

I was able to add a mult-threading like capability to my app. Source code has been updated to reflect the change.

Here's the pertinent piece:

boolean cycleCheck(unsigned long *lastMillis, unsigned int cycle) 
{
  unsigned long currentMillis = millis();
  if(currentMillis - *lastMillis >= cycle)
{
  *lastMillis = currentMillis;
  return true;
 }
else
  return false;
}

Here's the github code for anyone that might benefit: https://github.com/dhysong/ArduinoGarageOpener/blob/master/src/GarageDoorOpener/GarageDoorOpener.ino

edited Oct 1, 2012 at 23:52

answered Oct 1, 2012 at 13:21

dhysong

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4 Comments

dhysong Over a year ago

I just looked at: arduino.cc/playground/Code/Interrupts, and I'm not clear on how this would solve my problem. Could you please elaborate or provide some example source code? thanks, Drew

Pawel Over a year ago

Take a look at a blog post I wrote some time ago: blog.3d-logic.com/2012/08/26/… In the project I use interrupts to get correct timing for my clock. The source is on github - you can find the link in the post.

dhysong Over a year ago

Thanks Pawel. I'll take a look when I get a chance (this is all hobby) and see if I can't improve on this thread.

The Tokenizer Over a year ago

So did you end up using interrupts drew?

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