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1  Using Arduino / Motors, Mechanics, and Power / Re: easy drivers vs pololu carriers A4988's vs DRV8825's on: July 24, 2014, 11:48:42 pm
thanks guys


ill get to work on finding motors then.\


let me ask this, putting current limits of these chips aside, witch is more reliable, is there any known problems or major drawbacks to either of the chips?
should i worry about buying chips for so cheap on ebay?
2  Using Arduino / Motors, Mechanics, and Power / easy drivers vs pololu carriers A4988's vs DRV8825's on: July 24, 2014, 11:38:01 am
So basically by question is, witch one of these would be the best bang for my buck?
I planning on using them for my 3d printer build.

I'm using a arduino  uno, and 'TeapCup' firmware.
Still undecided on the motors.

is there really that much of an advantage to the DRV's vs the A4's other then the the DRV's having 1/32 stepping


I know this isn't a 3d printing forum, but does anybody know if I really need 1/32 stepping or even 1/16 stepping?
Would 1/8 stepping be fine if i just went with the Easy Drivers?

i found some easy drivers on ebay for $2.33 is this to good to be true? the seller has over 90% customer satisfaction.


anyways thanks for you help in advance guys.
3  Using Arduino / Displays / Re: LCD monitor wiring on: April 06, 2013, 07:29:03 pm
Yeah your right, sorry I should explain better, I guess I wouldn't be using motors, they would be some sort of tiny valves, like solenoids or something like that, so each one basically opens for a tiny amount of time. They don't need constant power, in this case.
4  Using Arduino / Displays / Partial Solution on: April 06, 2013, 07:01:10 pm
Okay so I did some research and I came up with a partial solution but on a much smaller scale there is a crude image here:

So now my problem is I have 9 control signals to deal with, how do I get around this, if possible?

I should note: i'm assuming whoever reads this is familiar multiplexing, that is why I did not explain the diagram.


Thanks for your help smiley
5  Using Arduino / Displays / Re: LCD monitor wiring on: April 04, 2013, 03:06:18 pm
the way im looking at it is the motors are arranged in like a grid and to pick witch motor you want to run you do like A 2 or B 8  or C7 etc. if you get what I mean

This is basically what lcd monitors do but my question is how does it pluck out a specific pixel from the grid?

Here is a good chunk from a article explaining what im talking about

In order to use these OLEDs to create a picture, they must be arranged in a grid, spaced very close together. There are a number of ways of doing this. The simplest screen uses only one color of OLED. There is one cell per pixel on the screen. This type of display can be used for car radios, where full color is not needed. In order to get a full color display, capable of showing photos and videos, you can place red, green and blue cells very close next to each other. All three combined create one pixel of the image. By varying the brightness of each individual color, it is possible to create any color. When you want to show an image on the screen, you start with the top row. The top row is ´┐Żactivated´┐Ż by applying a voltage, and then you can input which pixels you want to turn on by applying voltages to the appropriate columns. The top row is deactivated, and the second row goes next. Eventually, you reach the bottom row and start again at the top.

6  Using Arduino / Displays / Re: LCD monitor wiring on: April 04, 2013, 11:43:19 am
So there is no way of just to do it without any extra hardware?
7  Using Arduino / Displays / Re: LCD monitor wiring on: April 04, 2013, 11:13:56 am
Well basically what my underlying question is could some how control say a 100 simple motors via a cable like a parallel port or a IDE cable.

I know this doesn't directly have to do with LCD's but its the same theory, because I want to have these 100 motors lined up in a grid, so really its the exact same thing as a monitor but instead you replace the lcd's with motors.
8  Using Arduino / Displays / Re: LCD monitor wiring on: April 03, 2013, 10:04:24 pm
Thanks for the replay.

The pages you linked to were informative but didn't really answer my question.

9  Using Arduino / Displays / LCD monitor wiring on: April 03, 2013, 06:14:41 pm
I was just wondering on a vga cable connector there is a few pins, however how do just these few pins control thousands of pixels on a monitor?

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