Uploaded March 2019 | Updated September 2026, 2 weeks ago
wwwh.umble-pi.com
You can buy my book now!
UPDATE: We are out of beam books!
Behind the scenes video is here:
youtu.be/L_pWPM8T-kc
Get it from Maths Gear and be guaranteed a signed first edition hard back.
mathsgear.co.uk/products/humble-pi
But it is also available on Amazon.
amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21
For teachers (or anyone who would like some extra maths to do!) we have made an activity sheet about infinite series which give pi.
think-maths.co.uk/pi-sums
Celebrate Pi Day this 14 March (the date is written 3.14 in some countries; good enough for me!).
Check out the fantastic chalkdust magazine: chalkdustmagazine.com
CORRECTIONS
- I’m not worrying about the bending of the beam bringing the forces slightly closer to the turning point. Just getting in before anyone brings it up.
- People are upset I said torque instead of moment. I’m sorry.
- People are upset I said “one over a fourth” instead of “one over four”. Technically I was wrong. But am TOTALLY NOT SORRY.
- Let me know if you spot anything!
Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset:
David Wagner
Bruce Patterson
Andrew Jarvis
Loren Thomas
Thijs Raymakers
Support my channel and I can make more maths videos:
patreon.com/standupmaths
The t-shirt I'm wearing is "Woven" by Ugmonk. The discount code STANDUPMATHS should get you 10% off.
shop.ugmonk.com/products/woven
Music by Howard Carter
Filming and editing by Penguin
Design by Simon Wright
MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
Maths book: wwwh.umble-pi.com
Nerdy maths toys: mathsgear.co.uk
wwwh.umble-pi.com
You can buy my book now!
UPDATE: We are out of beam books!
Behind the scenes video is here:
youtu.be/L_pWPM8T-kc
Get it from Maths Gear and be guaranteed a signed first edition hard back.
mathsgear.co.uk/products/humble-pi
But it is also available on Amazon.
amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21
For teachers (or anyone who would like some extra maths to do!) we have made an activity sheet about infinite series which give pi.
think-maths.co.uk/pi-sums
Celebrate Pi Day this 14 March (the date is written 3.14 in some countries; good enough for me!).
Check out the fantastic chalkdust magazine: chalkdustmagazine.com
CORRECTIONS
- I’m not worrying about the bending of the beam bringing the forces slightly closer to the turning point. Just getting in before anyone brings it up.
- People are upset I said torque instead of moment. I’m sorry.
- People are upset I said “one over a fourth” instead of “one over four”. Technically I was wrong. But am TOTALLY NOT SORRY.
- Let me know if you spot anything!
Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset:
David Wagner
Bruce Patterson
Andrew Jarvis
Loren Thomas
Thijs Raymakers
Support my channel and I can make more maths videos:
patreon.com/standupmaths
The t-shirt I'm wearing is "Woven" by Ugmonk. The discount code STANDUPMATHS should get you 10% off.
shop.ugmonk.com/products/woven
Music by Howard Carter
Filming and editing by Penguin
Design by Simon Wright
MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
Maths book: wwwh.umble-pi.com
Nerdy maths toys: mathsgear.co.uk








![I wired my tree with 500 LED lights and calculated their 3D coordinates.
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 well 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 didnt 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, Ill 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/ I wired my tree with 500 LED lights and calculated their 3D coordinates.](https://i.ytimg.com/vi/TvlpIojusBE/mqdefault.jpg)

