https://github.com/hzeller/glowxels

Glow-in-the-dark canvas
https://github.com/hzeller/glowxels

Last synced: 8 months ago
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Glow-in-the-dark canvas

• Host: GitHub
• URL: https://github.com/hzeller/glowxels
• Owner: hzeller
• Created: 2018-02-11T00:15:56.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-10-01T15:18:05.000Z (about 1 year ago)
• Last Synced: 2024-10-18T05:18:28.641Z (about 1 year ago)
• Language: C++
• Homepage: http://glowxels.org/
• Size: 3.88 MB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
Glowxels - Glow in the Dark Pixels

==================================

Driving 405nm LED line to make a pixelated glow-in-the-dark display.

[![Glow Screeen](img/in-action.jpg)](https://youtu.be/4Vhdp7ZXU_8)

The pitch is relatively small with 1.5mm (667/meter). It is achived with two

rows with 3mm pitch of 3528 package mounted in a zig-zag pattern to have the

adjacent pixels without visible gap in X-direction.

The row distance in Y-direction is 3 pixels apart (4.5mm), so even and odd

pixels in a row will be sent 3 pixels spaced when sending.

Power for the LEDs is supplied with two rails on the back - in the installation

they are just mounted against two power rails.

The LEDs are driven by an [STP16CPC26]-chip - a neat 16 bit shift register with

constant current drivers. The serial data is just sent using the SPI bus on

the Raspberry Pi (with CS connected Latch), this is super-simple to wire.

Each board carries 64 LEDs and can be chained easily. The first glowxels screen

had 5 boards chained for 320 pixels on a 48cm wide screen.

A narrow version with 0.8mm pixel density is in the [feature-20240902-narrow](https://github.com/hzeller/glowxels/tree/feature-20240902-narrow) branch.

![](./img/schematic.png)

![](./img/board-render.png)

![](./img/board-render-back.png)

[STP16CPC26]: http://www.st.com/resource/en/datasheet/stp16cpc26.pdf