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181  Using Arduino / Project Guidance / Re: Rapidly spinning laser to create one-lined image on: May 12, 2012, 08:22:07 pm
Quote
What can I use to rapidly turn the laser on and off to create the dotted pattern I need?

You may need to study up on the persistance of vision setups for ideas.
I'm requesting the name of the electronics hardware that can rapidly turn something on and off. Relay? Transistor?
182  Using Arduino / Project Guidance / Re: Rapidly spinning laser to create one-lined image on: May 12, 2012, 08:12:44 pm
What can I use to rapidly turn the laser on and off to create the dotted pattern I need?
183  Using Arduino / Project Guidance / Re: Rapidly spinning laser to create one-lined image on: May 12, 2012, 08:11:34 pm

Yep - it's called a photo-transistor. smiley-wink

 you could attach the photo-transistor to this support in some manner, and when the beam sweeps by, there's your timing mark. Now, all you need to do is keep the speed of the motor steady

Something like this?
184  Using Arduino / Project Guidance / Re: Rapidly spinning laser to create one-lined image on: May 12, 2012, 08:10:26 pm
Line making spinning laser gizmos are fairly common.

http://www.harborfreight.com/catalogsearch/result?q=laser

right, I know, but making it display a dotted pattern of my choosing using an arduino is the hard part.
185  Using Arduino / Project Guidance / Re: Rapidly spinning laser to create one-lined image on: May 12, 2012, 07:46:23 pm
That's interesting but won't  work for this. I need a DC motor with a high res encoder. It will just be spinning a mirror. It needs to be able to 'point' to 100 different places along a 4ft span by rapidly turning on and off as it spins.
186  Using Arduino / Project Guidance / Re: Where can I get a small, DC motor w/Encoder? on: May 12, 2012, 07:32:33 pm
1800+ RPM? Doesn't sound like it.
187  Using Arduino / Project Guidance / Where can I get a small, DC motor w/Encoder? on: May 12, 2012, 06:49:14 pm
I found a bunch with gearboxes but I don't want a gearbox nor do I want to pay for the gearbox and just remove it. Do you know where I can find a small, 1800+ rpm, DC motor with built in encoder?
188  Using Arduino / Project Guidance / Rapidly spinning laser to create one-lined image on: May 12, 2012, 06:15:39 pm
I need to know if a device exists that consists of a laser, pointed at a spinning mirror oriented at 45° such that the laser draws a line. This device would need to have an optical encoder on the motor so that, using a micro controller, the laser could be rapidly turned on and off at specific times to create a one-lined 'image'. The main component of this device would be a DC motor with built-in encoder. Are there example projects that use one? I need to be able to use this device to light up specific areas within the solid line that it is capable of creating.

The more knowledgeable among you will be able to recognize this and be able to point to devices that function similarly. There may be an off-the-shelf device that already does this on some level. Does anything come to mind?
189  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 09:48:33 pm
@ David- There you have it, you proved my point !!

You don't have a point. You have a series of misunderstood assumptions that aren't anywhere close to reality. I'm thinking that you are either a teenager or English isn't your first language. Either one of those two scenarios would explain the incredible lack of reading comprehension on your part.
190  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 08:55:41 pm
It only works with the 5v line removed, a resistor on the +- rails and a cap on the +- rails. Won't work with 5v line attached. (This is about the 10th time I've mentioned this. (you know, due to your poor reading comprehension and all..))

What do I get for proving you wrong for the 20th time? huh? What makes it worth my while?
191  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 08:09:39 pm
I'll explain your current misunderstanding again. A car with a flat runs slow and is very noticeable. It does not perform the same as a car without a flat. However, the way this circuit is setup performs perfectly. Therefore, your analogy and assumption is completely false, as usual. Is there anything else you'd like to be corrected on?
192  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 07:41:14 pm
That's because you're misunderstanding the situation as usual. Nothing new.
193  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 07:28:55 pm
I've taken the time to show precisely where you misunderstood things on each occasion. You wouldn't know that though because comprehending what you're reading is not important to you.
194  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 04:32:55 pm
The problem is that all the other times you were wrong you were serious so it's not surprising if the one time you were joking, someone misses it.
195  Using Arduino / LEDs and Multiplexing / Re: Problem when expanding on the ShifOut tutorial for LEDs on: May 10, 2012, 01:46:32 pm
If you read closely enough you would know that I'll never be using it with a wall adapter because a computer will always be sending commands to it. That means it will always be powered via USB. Even so, I bet it would still be fine with a wall adapter too.

The windows program bug doesn't have anything to do with why it needs to be wired this way to work. Pay more attention to detail.

The entire question, the whole time, was why does it work wired this way and not work wired the 'correct' way? You don't know the answer to that question so instead you're just making uneducated, uninformed, broad, generalized guesses.
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