Basic "if loop question

Firmware
1

Hello,

I’m having moderate but not complete success with an app I’ve written.

The app should flash LED 6, unless I press the corresponding button 3, in which case it stops the flashing cycle, emits a different color during the duration of the button press, and publishes the state change.

I think this is a pretty basic question but my code doesn’t seem to work:

Screen Shot 2016-06-14 at 1.23.24 PM.png1142×1216 117 KB

2

also, should say b.led(6,255,0,25);

Right now when I run this software it doesn’t seem to run the first part of the If loop

3

I’d rather say the else if() can never be true since else is only ever the case when the if() is not :wink:
If you replace the else for an inverse if() your else if() would read like this


  // reworded else if
  if ((b.buttonOn(3) != true) && (b.buttonOn(3) == true))
    // this will never happen ;-) 
    // unless you are exceedingly quick to switch the button between the two function calls ;-)
1 Like
4

I see what you’re saying. So my pseudo code of:

####If button state is unpressed, Light up LED color 1

####If button state is pressed, Light up LED color 2

is impossible to execute?

I’ve only really done Matlab and a bit of Python, never any hardware interfacing like this, so I’m not sure how the logic should work

5

It’s not impossible but the way you’ve written it is not working.

You’d rather want something like this

  if(!b.buttonOn(3))
  {
    button3 = false; 
    b.ledOn(6, 255, 0, 25);
  }
  else if(!button3) // else already implies b.buttonOn(3) == true
  {
    button3 = true;
    ...
  }
6

Your if and else if have the exact same content in them.

And screenshots are a horrible way to share and discuss code.

7

@tedder be nice! :wink:

@charlietokowitz there are a couple of alternate ways that you can share code in the forums:

  1. If it is a short snippet, paste your code into the compose window and click on the button in the formatting bar (</>)

  2. If it is a long code block, you can create and link to a “gist”, or a code snippet hosted on GitHub. They’re free to make, and format well within Discourse.

https://gist.github.com/