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Cool and Cute LEDs at MakerFaireTokyo2020



Maker Fair Tokyo

I went to Maker Faire Tokyo, a festival for craftsmen.

It's a very fun event that involves electronics, machine work, music, woodworking, crafts, education, and anything interesting that involves making things. Kohacraft has also participated as an exhibitor twice, in 2015 and 2016.

When we exhibited, we had a display of electronic crafts bursting with ideas and mbed cat-chan programming Hands-on, etc., and I remember having a lot of fun and being very tired.

This was the first time in a long time that I enjoyed Makers Fair Tokyo as a visitor. The reasons for making it and the techniques used are all interesting. I'd like to introduce some of the coolest and prettiest LED works among the many exhibits.

だんごしっぽ さん (means dumpling tail)

There was a display of cute cat robots that opened their eyes and blinked, but one thing that really caught my attention was this.

This is a 7 segment LED in the shape of a cat. He used a 3D laser printer to make a shaded part and a light-permeating part, and combined them. It didn't shine at this fair, but I was shown a picture of it shining.

Our Mr. Kohacraft also made a 7-segment LED with a 3D printer,

Thanks to the 3D printer, it is possible to create more and more original segmented LEDs with this kind of design. I felt so much potential.

Dango Shippo-san's booth was full of cute artworks.


Silrium, which is famous for their watch kits that solder 60 chip LEDs, made a full-color, 7-segment LED.

He designed the segment shading part uniquely and put a Neopixel LED in the hollow. This makes it one of the rarest full-color, seven-segment LEDs in the world.

The key is to put a sheet on it so that the three colors of this full-color 7-segment LED and the RGB of the Neopixel LED appear to blend together nicely. He said that the special diffusion sheet from 3M was the best choice because ordinary paper would not mix the colors.

The original 7-segment is deep.

Silrium's 7-segment love was deeper, and there was clock that used a large number of 7-segment LEDs. The brightly lit area is the current time, and the other numbers are randomly animated. Is it like the background of the movie "The Matrix"? This animation has several modes that you can change from your smartphone.

The back side of the board is like this. Electronic components such as microcontroller and IC are neatly placed between the 7-segment LED.

It seems that this watch will also be made into a kit, and like the LED watch with 60 chip LEDs, it will take a lot of love to make it. It was a lot of love and fun works.

yi lab

This is an LED module with a chip LED in a case carved out of wood (mountain cherry blossom), which looks like a dot-matrix LED. This module can display numbers and operators and can be freely configured. By arranging the modules like a formula, they communicate with each other and the calculation results are displayed on the rightmost module.

I thought it was cute because the shape was like a Nixie tube IN-12B.

The wooden case is CNC machined by a vendor. There is a microcontroller in a small case. In the future, they plan to make it possible to do contactless power feeding.

The texture of wood has a nice, gentle feel to it.


It's hard to see in the picture, but these chuppa chaps are glowing. And each candy glows individually. They glowed individually and displayed a spectrum of music.

The program to do spectral analysis of the music on an Arduino is amazing, but they had more difficulty removing the wrapper from the candy than anything else to prevent it from tearing.

It was a wonderful piece of work with a lot of passion.


"Ronbun Mamoru-kun" (with a function that does not work when the hand is on the keyboard using a heat sensor) that mechanically presses [CRL] + [s] and saves the sentence being created, and an alarm clock "Atogofundake", which automatically stops when the sound sounds and let me sleep until the next snooze sounds, was also interesting, but "Kachi Kachi 2020", which was a manual counter converted into a clock, was also interesting.

A servo motor pulls the switch on the manual counter and counts it up, making the clock an art form.

I use M5Stack Atom Lite as a microcontroller which is connected to the network and receives the time from the NTP server. This makes it a mechanical watch, but an NTP watch that displays the time accurately.

The advance of time from 59 minutes to 00 minutes was handled by moving the servo 40 times. When the power is turned on, it has to count up from 0000 to the current time, but it can now support starting at 1111, which means that the initialization time can be reduced.

A truly lovely piece of work.

It was at this exhibit that I first learned about the M5Stack Atom Lite microcontroller module.

A small ESP32 module with the display and battery removed from the M5StickC. This is useful. I'd like to try it next time.



After MakerFaire, I stopped by Akihabara.


I would definitely visit ShigeZone when I stop by Akihabara. It's in the Radio Department Store, but they moved from the third floor to the first floor. The number of products had increased tremendously.

The HDMI capture was on sale for 880yen.

Maybe it's similar to this one I bought before.

If so, it's very convenient and affordable. This is useful if you want to easily display HDMI on your monitor.

One thing I'm very curious about right now is this scale with a counting mode. Sometimes it's a bit difficult to count the parts of the kits sold in kohacraft's shop, so the ability to count the number of parts is appealing to me.

KADEN no KEN chyan

This is a store that specializes in retro game consoles, and this is where I got a sticker from TokyoFLIP-FLOP. There were also free marble stickers and floppy disks made of substrate.

Akizuki Denshi Tusyou

So now it's closed on Sundays and holidays. The shop was closed.


I had fun at MakerFaire

It's been a while since Maker Faire Tokyo, and I got a lot of enthusiasm from the hot makers. It's a great event. The next Maker Faire will be held in December in Ogaki City, Gifu Prefecture.