LED Persistance of Vision Globe

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Introduction: LED Persistance of Vision Globe

Maker Olympics Contest 2016

Third Prize in the
Maker Olympics Contest 2016

Hi!

This is a project similar to the one already published, but upgraded. It consists of 64 LEDs and 90 columns, so the resolution is 5760 pixels.

I also used the shift registers, but 8 of them, one for every 8 LEDs. To transfer power to the shaft I used slip ring from the alternator.

The frequency is quite small, about 20 rps, which is about 1200 rpm.

Step 1: Materials

I hope I wont forget something, but everything should be here:

-64 LEDs

-Arduino Uno

-8 shift registers (74HC595)

-64 220 Ohm resistors

-Slip ring and brushes (from alternator)

-PVC pipe (18cm)

-Shaft (10mm)

-220V DC motor

-PWM

-Flat wires (for LEDs)

-Baearing

-2 switches

-5V power

-Aluminum sheet 2 mm

Step 2: Housing and the Ring

Housing is made from 2x2 cm square metal pipe.
The ring is end piece of PVC pipe, and it have 64 3mm holes for LEDs and two 10mm for shaft.
After painting and drilling i put it all together. On top is metal bearing, and on lower side is conected on the motor.

Step 3: Power, Shift Register and PWM

5V DC power, shift registers and PWM PCBs I made myself in Eagle. Here you have schemes of the circuit.

Step 4: Slip Ring

Slip ring is used for powering the shaft, it's easiest way to do it. Just be careful! It needs to be centered or you'll have breaks in power transfer. Because of this, your Globe won't work, so you'll need to put capacitor as big as you can buy.

Step 5: Putting All Together

Arduino Uno and PCB with shift registers are placed on fiberglass on the shaft. 5V DV power and PWM are in housing. You have only 3 wires from arduino to the shift registers PCB. LEDs and Arduino have the same source od power supply.

Step 6: Program

I just upgraded program that I find on Internet. You can make any picture or write something in few seconds. Pictures have 5 760 pixels(90x64).

Step 7: Final Result

If you have any questions, feel free to ask me on lluka.karnis@hotmail.com
And here is my video on youtube:

https://www.youtube.com/watch?v=xr-NJNhTUfI

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    65 Comments

    Hi! I am trying to figure out how I can pulse an LED at 80 times per second (4.8khz). Could you point me in the right direction?

    Really like how this turned out. do you think the base could be made smaller?

    can you post your Excel program?

    how large could you made something like this?

    looks like i gotta find someone to teach me how to do this! definitely want a couple but damn i have never made anything in my life! good job motivating me!

    this is really cool - a larger one with just a bit more resolution would be great for fictional worlds

    How complicated would you say the math is to make everything show up on time?

    I think it's not very complicated ;)