Go Down

Topic: 8x8x8 Led Cube inverted, help needed (Read 2565 times) previous topic - next topic

Wagner Sartori Junior

Hi,

I'm trying to do my 8x8x8 led cube as showed on http://www.instructables.com/id/Led-Cube-8x8x8/.

I actually made the led cube and the latch array board. I put the transistors on my breadboard and started to test with my arduino. All the leds lights up and stays on, no effects, nothing.

So, I started debug the circuit and after 2 days I discovered the big, HUGE mistake. I soldered all 512 leds inverted(instead anodes down I soldered cathodes down on columns).

So, is there an easy way to remedy the situation? I really didn't like to solder all my led cube neither loose my latch board. If I have to choose I prefer to make another latch board. As I said the NPN transistors are on my breadboard(easy to change).

Latch board is a 74HC138N(to drive CP pins) and 8 x 74HC574N. Schematic available on http://www.instructables.com/id/Led-Cube-8x8x8/step30/Build-the-controller-layout/

Thanks,

Wagner Sartori Junior

Msquare

:smiley-sweat: - yeah, I feel your pain.

Anyhow, here is a simple single diode circuit where I have "accidentally" put the LED in the wrong way round on the left side, and on the right side I've turned the circuit round to match. I switch + and -, I've swapped the NPN for a PNP. This is sort of the way you have to go, I think (have not tested it) This way you ned change anything on your multiplexers or such like.


Wagner Sartori Junior

Thanks for the response.

Do you know a good PNP transistor to switch 1.28A and hFe(min) 160?

Wagner Sartori Junior

Msquare


Wagner Sartori Junior


Go Up
 


Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy