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Author Topic: My 3x3x3 and 5x5x5 LED cube  (Read 9410 times)
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Nice job with the build and assembly Wondertiger.
What current are you seeing from the 74HC595 outputs?
Set an LED high and measure the voltage across a 220 resistor.
I'd expect something like 2.8V/220 = 12.7ma if your LEDs have a Vf of 2.2V and you're actually gettiing 5V out of the 74CH595.
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I did a measurement with a cheap digital volt meter and it came around 2.5V. I think I should invest in a better multimeter in the first place (a buddy of mine has an industrial fluke that works really well he said, maybe I should look for something like that) to get some accurate readings  smiley-red
« Last Edit: February 18, 2013, 05:39:30 pm by WonderTiger » Logged

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I did a measurement with a cheap digital volt meter and it came around 2.5V. I think I should invest in a better multimeter in the first place (a buddy of mine has an industrial fluke that works really well he said, maybe I should look for something like that) to get some accurate readings  smiley-red

There are many reasons one might want to upgrade to say a fluke DMM (I own 3) but for the kind of stuff your doing with a typical arduino project a simple cheap DMM (unless defective) will not be a big deal as far as accuracy goes. Like any tool, it's not so much the tool but rather knowing how to use it properly and understanding it's limitations. The biggest draw back of modern DMM is that it always displays a number even when the number being displayed doesn't mean what you might expect it to or want it to mean. Measuring the output of a active PWM pin is one example of a improper measurement for a DMM, it will display a number but it doesn't mean what you think it means.

Lefty
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I absolutely agree with the statement you made. However I think a good meter will be a good investment though (for my study and other projects in the future) even if it isnt really meaningful for now yet.

« Last Edit: February 18, 2013, 05:58:42 pm by WonderTiger » Logged

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I use an inexpensive Extech (extech 330) meter that seems to work really well. You don't need to go overboard with an expensive Fluke meter.
« Last Edit: February 18, 2013, 06:02:46 pm by CrossRoads » Logged

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You're absolutely right with the statement you made. However I think a good meter will be a good investment though(for my study and other projects in the near future) even if it isnt really meaningful for these kinds of projects yet.



I agree mostly about good test equipment being a near lifetime investment that will pay good dividends for a long long time. After working for decades in the electronics industry I found that fluke meters and tektronix scopes were all I ever wanted to own for personal use.

 But the point is that arduino beginners should be encouraged that their first purchase to make after their arduino board is a DMM, well before obtaining any other components and/or modules for their various projects. So the $10 DMMs serve a good purpose in at least getting them started on the right path. Many young people starting out just can't yet afford the investment costs of say a Fluke meter, but can swing for a $10 DMM which is much better then no DMM at all which all too many appear to have.

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We just got my son a $19 extech meter, sprung for a little extra because this one also came with a thermocouple probe.
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We just got my son a $19 extech meter, sprung for a little extra because this one also came with a thermocouple probe.

Cool, and if he misbehaves tell him you will use that probe to take his temperature the 'old fashion way'.  smiley-wink

Lefty

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We got him a $119 Weller soldering station too, so I think he'll behave.  Off to college in the fall...
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We got him a $119 Weller soldering station too, so I think he'll behave.  Off to college in the fall...

What, no pocket protector? What will the other nerds think of him?

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Going to RPI, whole schoolful of engineers. Kids are too cool for pocket protectors these days.
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Been a while I posted something here. Last weeks I was very busy with school (we are developing a weighing scale). However I managed to make a very easy animation for my cube smiley, enjoy:

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Hey Mike!

Nice video smiley

I've recently built a similar 4x4x4 cube. I'm having some trouble with ghosting on the cube (it seems that the cathodes are not turning off quickly enough). The way it manifests is that when I turn on a pair of a new anode plane and a new cathode column, the LED which at the intersection of the new plane and the old column, lights up for a brief moment. This results in ghosting. It is most likely a hardware problem, but I want to make sure that it's not a software problem. Have you had any kind of similar ghosting problem? Would it be possible for me to see your code, maybe I'll get some insights about what I might be doing wrong...

Thanks,
Andras
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I have not seen 'ghosting'on my cube. However if I light up 1 layer, the layer above the lit one will shine very dim. But this is due the light goes through the bottom of the LEDs.

« Last Edit: March 08, 2013, 08:46:27 am by WonderTiger » Logged

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Yes, I have the shine-through effect too, but that's not a big problem and there's not much you can do about it anyway. Thank you for the code! smiley I will check it.
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