Let's Make Robots!

Robot Cube?

Entertains people/self

While this may not be as awesome (or mobile) as the other robots but its something i've been wanting to do for a while ever since i saw one on youtube. Right now it consists of two 2x2 LED squares and a 2x1 line, in the end it will be 3x3 however i somehow lost LEDs : /. This is very basic however seems like a source of near endless fun, it also helps to reinforce simple programming knowledge. I also didnt have time for a video or a real demo but if people want one i guess i could make it before its complete.Questions or comments, ill take both. 

Picture_045.jpg obviously suposed to be an "L"

Picture_046.jpg "M" fail..

Picture_047.jpg "r" somewhat fail (just realized this but this is not the first image upside down : / hopefully this will look better when its 3x3

Picture_048.jpg Wirings still a mess but ill worry about that after its morecube like



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Pulse Width Modulation (this one is for free) will control the brightness of a LED.

In order to control more LEDs than you have outputs on your Picaxe Micro, you will need clever use of POV. That one is for you to Google.


alright thanks guys, i didnt know the correct term that i should have been searching for. Progress update after i finish the second and third manual

Zanthess did a Tip / Walkthrough


yea charlieplexing is your best bet cause leaves you with ton of digital pin left to use for what ever.  LED =  N x (N-1)   So 5 digital pin would be  5 x (5-1) = 20 LED.  Its really is a cool idea to use for stuff like this.
i read through the charlieplexing info on wiki, however my programming abilities are very basic (no pun intended). Three level logic sounds a bit intimidating
You could try using SIPO shift/latch chips. As these cascade you can drive as many LEDS as you want with only three output pins. It took me a while to find a supplier, but eventually I got 25 74HC595s from eBay for £7.50.
alright thanks mike ill look into it. I was also checking out some RGB LEDs they have at the radioshacks near my house. Might be worth it to make a smaller cube but with RGB LEDs instead.
RGB LEDs have 4 pins so you need more output pins if you want multiple colors to work.

How about a pre-made matrix http://futurlec.com/LEDMatrix.shtml very cheap!!!

Oh and they also have the 74595 registers Mike was talking about, pretty cheap at just .50 cents, http://futurlec.com/IC74HC00Series.shtml

Futurelec's not so useful for those of us in the "old country".