What I need to do a RGB LED CUBE.
- Thread starter Manel_s4
- Start date
8 x 8 x 8 x 3 = 1536 pins to control
so...
Multiplexed would require 80 outpins, 40X2 has 32 I/Os so wont work.
Charlieplexed confuses me but should be doable with PICAXE.
The way to go is Charlieplexing of which I dont fully understand so can't say how many I/Os it will take.
If you want brightness control then good luck with that, you will probably need an LED driver chip...or a few dozen LED driverchips...
Jamster
so...
Multiplexed would require 80 outpins, 40X2 has 32 I/Os so wont work.
Charlieplexed confuses me but should be doable with PICAXE.
The way to go is Charlieplexing of which I dont fully understand so can't say how many I/Os it will take.
If you want brightness control then good luck with that, you will probably need an LED driver chip...or a few dozen LED driverchips...
Jamster
It just occurred to me that maybe you could use this for your RGB LED cube:
http://www.sparkfun.com/products/10312
One of the comments says that the strip can be cut every 2 LEDs, so you could do 16 strips of 4 LEDs each and build a 4x4x4 cube.
http://www.sparkfun.com/products/10312
One of the comments says that the strip can be cut every 2 LEDs, so you could do 16 strips of 4 LEDs each and build a 4x4x4 cube.
Here is my 3x3x3 led cube's schematic. I add another photo of the cube for clarify each number of each LED. In the second and the third floor follows the sequence like the first floor.
In this schematic I haven't connected the jack socket 'cause I haven't found it in the DesignSpark, but it is connected in 2 and 3 of the 18M2.
In this schematic I haven't connected the jack socket 'cause I haven't found it in the DesignSpark, but it is connected in 2 and 3 of the 18M2.
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Here is my final schematic with all the componenents of the 3x3x3 LED CUBE MAIN COLOUR. I have been thinking, and finally, I'm going to build a 4x4x4 LED CUBE RGB. What do you think? What components I need?
I have thought, that if i use a LED DRIVER CHIP I can go without less outputs. Namely, if I don't use a LED DRIVER CHIP I need 4x4x3 = 48 outputs true? (Supposinght that I multiplex each floor, like the 3x3x3 main colour project)
However, I use a LED DRIVER CHIP, I need only 4x4 = 16+(I supose that three more(LED DRIVER CHIP)) = 19. Am I right?
I have thought, that if i use a LED DRIVER CHIP I can go without less outputs. Namely, if I don't use a LED DRIVER CHIP I need 4x4x3 = 48 outputs true? (Supposinght that I multiplex each floor, like the 3x3x3 main colour project)
However, I use a LED DRIVER CHIP, I need only 4x4 = 16+(I supose that three more(LED DRIVER CHIP)) = 19. Am I right?
• "I can go without less outputs": double negative. Do you mean "I can go without using as many outputs"?
• If it's a 4x4x4 LED cube then it will be 4x4x4 rather than 4x4x3. Anyway, you can use shift registers to save on pins but the extra overhead might be too much.
-First, yes. What I want to explain is this, that I can save many pins
-Second, I have wrote 4x4x3 because I'm only talking about one floor. And the number 3 is because i think that i have to multiply by three because de LED RGB has three pins.
I don't know if I'm right, I'm only asking.
Thanks.
Or would it actually be 4x4x4x3, one 4 for each dimension?
Of course, that amount of LEDS would have to be multiplexed.
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Yes, I've thought that I could mutiplex for each floor. What do you think? What components I need?
Sorry, I am not understanding you.
Please do not worry.
Jamster was replying to post#16
@nick12ab and Jamster.
Please remember that this Forum is international.
Many, very intelligent individuals, post questions here.
However, second-language fluency often does not run to
flippant or juvenile humour.
Think first. Think of the context.
e
The difference is when you have common cathode, the cathodes of the three LEDs built-in are connected together and each anode gets its own pin (i.e. one cathode is common to all) and for common anode it is the other way round (individual cathodes and one anode).
NPN transitor
Okey, thanks
inglewoodpete
Senior Member
I suggest the the next step is to draw a circuit diagram as you think it should be. Post the drawing here and get feedback. That way, you can get an idea if you are on course and not wasting your money.
Thanks, I've already bought the leds. I have chosen the comun cathode because all the people that I asked has recommend this type. And it's logical, it's easier to connect the three anodes directly in a chip and connect the comun cathode to the NPN transistor.
I'm working for the project (RGB LED CUBE 4x4x4). As soon as poosible I'm going to update my files.
If there is anybody that domains the item/theme, please give me some advices.
Thanks
I'm working for the project (RGB LED CUBE 4x4x4). As soon as poosible I'm going to update my files.
If there is anybody that domains the item/theme, please give me some advices.
Thanks