I wired my tree with 500 LEDs and calculated their 3D coordinates.

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From Standup Mathematician.

If you support me on Patreon at any point in December 2020 I will film your name on my xmas tree while I give you a thumbs-up of appreciation. https://www.patreon.com/standupmaths

Huge thanks to Eugénie von Tunzelmann for helping me out with this video. You can see more of Eugénie in my "General Relativity: Top 05 Mishaps [inc INTERSTELLAR]" video. https://www.youtube.com/watch?v=Z4oy6mnkyW4

Thanks to Ben Sparks for helping out with the GeoGebra file. You can try an online version here: https://www.geogebra.org/m/p2pdz6v2

And of course thanks to Howard Carter for yet one more remix of the Stand-up Maths theme song. The main theme is on bandcamp: https://standupmaths.bandcamp.com/ If there is enough demand we’ll make a Christmas album.

Here is my code on github (along with the 3D coordinates of all 500 LEDs on my tree). If you have a program you would like to see run on my tree, email me matt@standupmaths.com
https://github.com/standupmaths/xmastree2020

My prototype LEDs were type WS2801 and wired to as Raspberry Pi Zero.

The WS2801 LEDs I used on Amazon. Other retailers are available.
https://www.amazon.co.uk/dp/B01MDJ3VBC/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21

I set-up the Pi to run ‘headless’ (no monitor or keyboard) largely using this guide:
https://www.tomshardware.com/uk/reviews/raspberry-pi-headless-setup-how-to,6028.html

I followed this guide to wire and program the WS2801 LEDs. If you use an off-the-shelf power supply you do not need to worry about the mains wiring (which you should not do unless you are qualified).
https://tutorials-raspberrypi.com/how-to-control-a-raspberry-pi-ws2801-rgb-led-strip/

Then I switched the WS2811 LEDs because I could buy 500 of them (they are also cheaper). I also switched to a Raspberry Pi 3 because my Pi Zero didn’t have wifi.

The WS2811 LEDs I used on Amazon. Other retailers are available.
https://www.amazon.co.uk/dp/B0775CC559//ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21
https://www.amazon.com/ALITOVE-Individually-Addressable-Advertising-Waterproof/dp/B0775CC559?_encoding=UTF8&tag=stanupmath-20

I wired up the WS2811 LEDs and coded them using this guide.
https://learn.adafruit.com/neopixels-on-raspberry-pi/raspberry-pi-wiring

CORRECTIONS:
– None yet. Let me know if you spot anything!

Thanks again, as always, for Jane Street being my principal sponsor.
https://www.janestreet.com/

Thanks to my Patreon supporters who funded those LEDs. If this video does well, I’ll buy even more next year.
https://www.patreon.com/standupmaths

Filming and editing by Alex Genn-Bash and Matt Parker
Music by Howard Carter
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
Maths book: http://wwwh.umble-pi.com
Nerdy maths toys: http://mathsgear.co.uk/

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