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16  Using Arduino / Programming Questions / Re: 5 PWM's on, but nothing on: January 27, 2013, 10:40:59 pm
sorry to like completely spam this, but i keep finding new information. now i have noticed that while the ghosting is REALLY bad, it is easy to get disappear. only one layer of LEDs at full brightness and it is gone. but one layer a half brightness and it is still really bad. again, i am sorry to keep posting, i am just trying to post the most recent and up to date info i have. i would really appreciate some help, but i may need to move this to another section now that i think this has nothing to do with the code. should i move it?
17  Using Arduino / Programming Questions / Re: 5 PWM's on, but nothing on: January 27, 2013, 10:36:01 pm
ok, so the ghosting only occurs when LEDs are not on and is proportional to how many and how bright those LEDs are. when i have 2 layers on at full brightness there is no ghosting on the layers that are off. when i have 1 layer of LEDs on at a low brightness, there is a ton of ghosting. how bad the ghosting is is absolutely proportional to how many LEDs are on and how bright they are. both brightness and amount of LEDs on are factors in how much ghosting there is. and now when i plug this into a regular(500ma) usb port, it barely lights up. i am starting to think this has nothing to do with code. i think it is a hardware issue.
18  Using Arduino / Programming Questions / Re: 5 PWM's on, but nothing on: January 27, 2013, 10:29:42 pm
i now have no clue what is going on. i am at a complete loss. i plugged the arduino into a 1.5amp usb port. then everything turn on and the code worked perfectly, but there was an insane amount of ghosting. what is up? i am powering the LEDs from a 5v wall wart and i am using resistors to limit it to 3v. why is the arduino's power affecting the transistors(which is turning the LEDs on and off)?
19  Using Arduino / Programming Questions / 5 PWM's on, but nothing on: January 27, 2013, 10:18:15 pm
i am using PWM on pins 3, 5, 6, 9, and 10 to control transistors that turn on the ground to my layers on my 5x5x5 LED cube. when i use analogWrite(pin, 255) for all of the 5 PWM pins that i am using, it gives me nothing. its like it cannot use 5 PWM pins at the same time. i have no problem when i have 4 of the pins set to 255 at the same time, but 5 gives me issues. like the LEDs simply do not turn on at all. i think i see a little ghosting when this happens,too, but it is not bright like it is supposed to be. what is wrong? is it something wrong with my setup? any help is appreciated! thanks!
20  Using Arduino / General Electronics / Re: Power an arduino on: January 25, 2013, 12:54:37 pm
i have not measured the voltage, but i will make sure to do that.

and if i use a diode, there is no chance i will mess up the arduino? i just never thought of powering an arduino from the output pin and the input. i never thought that was possible.
21  Using Arduino / Programming Questions / Re: analogWrite low for ground on: January 24, 2013, 08:32:41 pm
It'll be fine, as long as you don't ask it to sink more than about 20mA.
ok. thank you!
22  Using Arduino / Programming Questions / analogWrite low for ground on: January 24, 2013, 06:52:04 pm
sorry if this is in the wrong place, this seemed to fit it best.
if i use analogWrite function to write a pin (non pwm) to low, that makes it a ground. i know it works because i have tried it. but...will this do any type of damage to the arduino?
23  Using Arduino / General Electronics / Re: Power an arduino on: January 24, 2013, 06:36:17 pm
Vin pin can only take up +5v....correct?
(this is by passing the +5v regulator?)
i don't think so. from what i have read the Vin can only take 6 to 20 volts, and 7 to 12 volts is recommended. but i may be wrong.
24  Using Arduino / General Electronics / Power an arduino on: January 23, 2013, 10:34:50 pm
i am sorry if this is the wrong place to post this, but i do not really know what category this would be in. it is more of a general question.
this may be a dumb question, but it is one that i could not find an answer to.
can i power the arduino uno with 5 volts on the Vin header pin? i know it says 6-20 are the limits and 7-12 is recommended, but it can be powered from usb. usb is only 5 volts. The reason i am asking is because i am making a project that is going to require a max of 2.5 amps. that is way more than the arduino can handle. so i bought two 5 volt 2 amp wall wart power supplies. it would be great if i could have those power supplies power everything including the arduino, but that may not be possible. i guess as a last option if i really wanted to, i could cut a usb cable in half and connect the power supplies to the usb cable, but i only have one of the usb cables the arduino uses. so if i used that for power, i would not be able to use it for data since it would be cut in half. so if that is what you guys recommend, i will buy another cable. i just dont want to if i can power the arduino from the power supplies directly. keep in mind that i am not trying to say that the power will come from the arduino for the project. the power supplies will be powering everything directly. i would just run wires to the arduino to power it. thanks in advance to anyone that helps in any way at all!
25  Using Arduino / LEDs and Multiplexing / Re: 5x5x5 LED cube help on: January 20, 2013, 11:47:50 pm
Im also wondering if just diffusing the tip would be good enough?
it probably would be. all (at least most) of the light is going out through the tip. even if that was just diffused with sandpaper or a file, it might just be enough.
26  Using Arduino / LEDs and Multiplexing / Re: 5x5x5 LED cube help on: January 20, 2013, 03:16:11 pm
haha. ok, this is a completely random idea...but what if instead of trying to add paint and things to the cube, we took a heat gun and melted the LED a little bit. not a lot, but maybe just a little. that will either work well, do absolutely nothing, or make it uneven and look terrible. but it *may* work.
27  Using Arduino / LEDs and Multiplexing / Re: 5x5x5 LED cube help on: January 19, 2013, 11:21:05 am
i tried leaving a LED in finger nail polish remover (acetone) all last night and it did not do anything. the LED is the same as it was when i put it in. i guess sanding it is the only option i have left. anyone else have any ideas for diffusing the LEDs?
28  Using Arduino / LEDs and Multiplexing / Re: LED problem on: January 19, 2013, 10:20:14 am
ok, i am no expert when it comes to this stuff, so take what i say with a grain of salt. but if i had to guess, the ground from one of your LEDs is activating your AND gate. take a look at the diagram i attached. that is my guess what is happening. but again, i could be completely wrong. im just letting you know what my guess is when it comes to this problem.
29  Using Arduino / LEDs and Multiplexing / Re: 5x5x5 LED cube help on: January 18, 2013, 05:37:18 pm
i have some 10,000mcd blue LEDs that are probably identical to the ones i bought. i only have about five left because i have used the others. but when i get a chance i will experiment with different ways of diffusing them. i will try to mess with them today, but i cannot guarantee that i will be able to,
30  Using Arduino / LEDs and Multiplexing / Re: 5x5x5 LED cube help on: January 18, 2013, 03:32:45 pm
i got 75 spare LEDs so i can experiment with different diffusing techniques. hopefully i figure out something that is both fast and yields good results.
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