Today I would like to introduce you to the winner of our competition: Mr. Ziegler took the trouble to create a regional version of the famous word clock and won the 150€ shopping voucher:
A Bavarian word clock (50x50cm) in rust optics
How it all started ...
My first contact was a German word clock module for my Magic Mirror (https://magicmirror.builders/). But I was bothered by the point quarter before nine. The correct indication is "D R A I V I A D L N A I N E" 😊
So I first rebuilt the module and installed the correct abbreviations and times. The right tool for creating the Clock Matrix can be found here https://github.com/pknoe3lh/WordClockGenerator/releases.
The output is this graph, with 11 rows and 11 columns.
The bigger problem was finding a font that could be cut with a laser. If this does not fit, the inside of the O simply falls out.
I then inserted the points at the Üs afterwards. So gracious was the found font (https://befonts.com/taurus-mono-monospace-stencil.html) then again not.
The second problem was to bring the total size to 50x50 cm and adjust the drawing distances to the 30 leds per meter.
he requires LEDs 11 x 11 = 121 pieces. that means 5 meters WS2812B LEDs at 30LEDs/meter IP30 White PCB. Is cheap at Aliexpress or similar.
After each LED, at full brightness, needs about 60mA, that's about 7A power demand, at 5 volts. Fiercely, right?
However, since my design is not yet complete, I will measure whether there is not much less brightness. I would like to get by with a 5V/3A power supply.
The frame used (50x50 cm) is available from Ikea. Calls itself RIBBA and costs 12.99€.
I have laser cutting https://www.cutworks.com/shop/# can be done. Two plates with shipping are still ok in terms of price. I actually wanted to do two WordClocks in rust optics.
But my partner liked the current station wagon so much that my first version will probably be without rust.
Then there is simply more time for the second plate to rust.
The back of the RIBBA serves as a construction platform. Behind each letter is thus an LED.
Please be careful with the LED arrangement. The parts have a signal flow direction. See the small arrow on the LED strip on the right. The microcontroller will sit at the bottom right and the LED strips will then run up in a meandering manner.
As a spacer between LEDs and steel plate I wanted to take a 3mm plastic plate (50x50cm) with matching recesses. However, this is too thin and does not block the light between the LEDs well enough. However, it was perfect as an adhesive template for positioning the LEDs.
I will now try to use moss rubber with 15x15mm, 8 meters should be enough.
This foam rubber will then (after the LED wiring of GND, +5V, DO to DI) both cover the wiring and force the LEDs into small squares. Hope the picture on the left is clear enough.
Then there is butterbread paper for the diffuse light. If the lighting for the letters is not uniform enough, you can still play LEDs to the steel plate at the distance.
the basis of the software is https://github.com/marcow1601/Wordclock
However, this still needs to be adjusted and some Alexa skill for the color switching should also be 😊
But this will be part 2 ...