| Component | Qty/measurement | Cost |
|---|---|---|
| Ikea LACK table | 1 | 5.00 |
| Raspberry Pi 2B (?) | 1 | 35.00 |
| WS2812b LEDs | 15x15 | 30.00 |
| 5V/3.3V buffer | 1 | 0.50 |
| 5V Power supply 18A | 1 | 26.77 |
| Acrylic 5mm | 560mm^2 + sides | 50.00 |
| MDF 3mm dividers | 14+14 | 70.00 |
| Various parts | 30.00 | |
| Total | 247.27 |
Begin by drawing a cross on the table, and recurse until the center of each cell is draw.
Cut the LED strip in pieces and paste them with hot glue on each center on the table. Connect the LEDs back together with three wires per piece (5V, GND and DI/DO). Pay attention to wire each DO (Data-Out) to a DI (Data-In) on the neighboring LED.
The dividers where tricky. My first thought was cutting it by hand out of cardboard. But I’m not really precise, and doing it 28 times (14 horizontal and 14 diagonal) would have been difficult.
After some looking around for other options I found snijlab.nl Which is a great online service that will laser cut SVG files. It does come at a price, but the result is beautiful and very precise. A side-effect of the laser cutting are the burnt edges. This actually gives a really nice effect as the black enhances the edges.
Controlling the LEDs is a Raspberry Pi (model 2B, other models will
also do). The Pi’s GPIO pins operate at 3.3V, the WS2812b expects a 5V
signal. To bridge this gap a SN74HCT125N 3.3V<->5V buffer is used.
It works \o/
Ordered, cut to the right size, at Dokter Plexiglas. Glued together with special Acrylic glue.
