solar analemma chandelier
* Since the axis of the Earth is tilted and the orbit is oval, not circular, it produces 8 asymmetrical figures.
A beautiful one!
So I decided to make an LED chandelier with 365 LEDs that mimic the solar analysis unit and therefore is both a style of astronomical calendar and a source of lighting for our restaurant.
I decided to stretch the analytical body in a way that could be cut from 4\'×8\' plywood, and that LEDs could be placed accurately.
The last request is very important to me. . .
Make this project more challenging because of each one. single. last. LED.
Need unique location, unique interval.
This is a famous photography challenge.
The first example was recorded by Dennis di Seco on 1978. 9.
Look at some of the others.
My favorite must be Tunc Tezel\'s \"Tutulemma\": a picture of analemma that includes a total solar eclipse!
The Earth orbit deals with all the annoying details of creating beautiful shapes, and Larry mcnis of the Calgary center of the Royal Astronomical Society of Canada does all the work to create spreadsheets for computing layouts.
I calculated the exact latitude and longitude of my house in 2016 with his spreadsheet and did some operations to convert it to the correct aspect ratio, install it to 4\'×8\' plywood in comfort and use Add-
Bureau of Immigration and Naturalization> script for import and export.
This creates all the points I need.
I created an offset line of 50mm from this line on both sides and squeezed the result shape of 18mm (
I plan to cut it out of 3/4 plywood).
Then I drilled 364 holes (yes, 364;
Figure 8 the two holes at \"X\" almost overlap, so I averaged their positions and made a hole there)
8mm in diameter, through the material.
Another 364 hole with a diameter of 14mm is drilled in the same position, but only 15mm deep.
I used Julie Kumar\'s tutorial on how to set the toolpath for Shopbot using Fusion360 and wrote the appropriate file (
Thanks so much to Julie and May for their help at this step).
But I think we\'re still at a very primitive stage-
Far from plun play and CNC-
A lot of settings are required for anything.
That being said: I am a complete newbie to these tools and I can do it completely, which may indicate how far we have gone!
The shopping robot at Pier 9 encountered some problems when I used the spindle speed (
It is stuck on 12,000 rpm)
Therefore, all operations are done with a vertical mill instead of a drill bit.
The first light painting above was taken by Steve Man, part of his photo series of the only augmented reality. Thanks Steve!
Lights are tracking the profile toolpath used to define the overall shape of the workpiece.
The second one was taken by Reed Goldshaw of harmonic light, who happened to visit on the same day, which was a good fortune for me. Thanks Reid!
The shape is processed with 3/4 plywood, using the plywood scrap of 1/4 below to minimize breakage.
All of them are charming;
Just like someone used to cut a straight line by hand (or machine)
Looking at the robot cutting the curve perfectly, drilling and making labels is very hypnotized.
The delay video below shows a small part of the whole process.
The shape is liberated from the paper using a sharp chisel, and the label is cleaned up using a router with edgestrimming bit.
I made rounded corners with a chisel at the \"X\" of analemma sharp.
To cover the exposed plywood edges, hide the electronics and add some stiffness to the fixture, I have stuck about 2 \"wide maple veneer seals on all vertical surfaces.
It is pre-glued and can be ironed.
I make sure to highlight it a little so it can trim flush with edges
Repair the router bit
The fragments produced are fragile (
Like most chandeliers! )
Because there is a large prominent part of the edge. banding. I hot-
A lot on the right.
The external triangular block I cut on the laser cutter has an angle to help strengthen it and eliminate any wave.
I finished it with four layers of polyurethane and gently polished between each layer.
You need 364 LEDs, arranged on a string instead of a strip.
I bought eight of these (
Note: these are still not available on Amazon, so if the previous link does not work, try searching for rgb Addressable led strings.
And/or let me know in the comments! ).
The spacing between front and back is different-
No two LEDs are exactly the same distance apart.
In addition to the density peak at the tight radius of the smaller loop, LEDs are ideal.
You have to take some cutters and trim the rubber material on the outside of the LEDs to make them fit.
I find it easier to remove all shells in most cases --
The harder core is only a little wider than the LED itself.
Initially I used a sander to narrow down the size of the LED housing but later found out that it could be cut and peeled off. D\'oh! Each LED is 0. 3 W so 0. 3 × 364 = 109. 2 W total.
It\'s similar to a bright incandescent lamp, but the extra efficiency of the led means it\'s much brighter in total.
The bulb draws about 50 mA with RGB at maximum brightness, so it is 0.
05 × 364 = 18a (! ! ).
So I bought a power supply for 5 V, 20 a to make sure I have enough juice.
Connecting them is simple: connect them together through the provided connectors and plug them into the power supply as shown in the figure.
The power supply also needs to be grounded.
I assigned the power to all the strings separately.
Of course, the same data lines connect them together.
I just pass the extra 5 v and GND lines through the loop and connect them together at the starting point.
I used a thicker gauge line to connect them to the power supply.
I got 1/4.
Insert 20 threaded plug-ins into the plywood and add eye bolts at 6 points on the periphery and put one by heavy-Steel wire on duty.
The accessory is then hung on the ceiling of Pier 9 carpentry workshop and powered on.
Like most chandeliers, it is fragile, so it is very careful to move and Hang (
Thanks Josh, Trent, Jeff, Mei and Scott! ).
LEDs are worth a cool light
Arranged in order, I want it to look like the sun is rising.
So the day you turn on the lightsi. e.
Sundial is another style calendar)
Then the rest of the analemma lit up like a sunrise.
Turning it off will reverse the process.
Michael Weiler (
Above, the night before the opening of the exhibition, coded below the analyzer set up at Pier 9 woodworking shop)
It was great to write these scripts and see him turn my vague ideas into a spectacular reality.
I am very grateful for his technology.
Dennis Hall is also a great source of ideas.
While analemma will be over at my restaurant, it\'s also the biggest piece I \'ve ever made for my four person Last Show event
Monthly residence time for Autodesk Pier 9 seminar.
So I want people to be able to interact with it in an interesting way.
So I made them a big green button that allows visitors to cycle between different lighting sequences (
Thank you so much Scott Kildall for your help with hardware and sequencing software).
The order is: 1.
Static display of astronomical data: Blue solstices, Green equinoxes, the first day of each month in red, white today, the rest of the Year in Yellow. 2.
Sunrise: The current day lights up white, and the rest of the analemma goes from black to dim purple to red, from orange to yellow --white. 3.
Sunset: The reverse of the sunrise. 4. PARTY!
A crazy demo reel. 5. All LEDs off.
This code is published in (
Thanks to Mike).
The 4 x speed movie for 5 sequences is shown below.
I made the case with laser cut 1/4 black acrylic and used super-
Everything about it is deliberately excessive.
Look at that huge green button!
It only needs to keep the Arduino Uno and a small circuit that detects the pressing of the switch.
I didn\'t glue the lid so everything was easy to get close.
The button is double.
Stick tape to the table and see foot traffic in a conspicuous position.