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[Reply #15 on:]

How helpful do you need it?

[Reply #16 on:]

So I guess this: DDRD = DDRD | B11111100; would go in setup.. and in the loop, if I want to change pin 7 on and off, I would alternate between PORTD = B10000000; and this: PORTD = B00000000; Is there a way to do that last part with one line of code in the loop instead of using if statements?

[Reply #17 on:]

You'll want to look into the BitMath tutorial.

To do specifically what you're asking you could just PORTD += B10000000.

[Reply #18 on:]

Ok. I went from this code, which just produces a solid line:

Code:

void setup() {
  DDRD = DDRD | B11111100;
}

void loop()
{
  PORTD += B10000000;
}

to this code which produces a dash that is way too long.

Code:

void setup() {
  DDRD = DDRD | B11111100;
}

void loop()
{
  delay(1);
  PORTD += B10000000;
}

How would I delay shorter than that so that I find a middle ground which produces dots right next to each other as opposed to a solid line or long dashes?

[Reply #19 on:]

You could change the millisecond delay to something shorter.
Maybe a few tens of microseconds?

[Reply #20 on:]

Also what part of make the PWM frequency higher do you not understand?

[Reply #21 on:]

You could change the millisecond delay to something shorter.
Maybe a few tens of microseconds?

That would be great. How do you do that? I've only ever heard of the delay() function.

[Reply #22 on:]

There's a really useful reference section over at the main site.

[Reply #23 on:]

Also what part of make the PWM frequency higher do you not understand?

The problem with PWM is, as I explained earlier, if you use analogOut(laserPin, 10); for example, its on for 10 clicks but off for 245 clicks! That's a big problem

[Reply #24 on:]

No you do not understand.
You use a PWM value of 128 BUT you change the PWM FREQUENCY!!!

[Reply #25 on:]

No you do not understand.
You use a PWM value of 128 BUT you change the PWM FREQUENCY!!!

ooooooohh..

[Reply #26 on:]

This works:

Code:

void loop()
{
  delayMicroseconds(100);
  PORTD += B10000000;
}

If the value is too small it becomes a solid line. Probably because the wave isn't very square. Fixing that though is over my head.