Final Project Rough Idea

Currently, I have two ideas about the final project.

One is ” ice 3D printer “.

I thought this would be technically very difficult, so I thought of a backup plan.

That’s this lighting accessory.

1. Concept

I created a lighting accessory based on the motif of a traditional Japanese lantern “Andon(行灯)”.
This accessory is designed to be worn with a kimono or a yukata for women.
At events such as festivals and fireworks displays, the lights shine in response to the music and brightness of the surroundings.
In addition, you can program the glow to match the design of the kimono or yukata you are wearing.

2. 3D Modeling

I have created two image images when the LED is lit and when it is not lit.
This was created on week03.

I have modelled this Accessories to a size of 20mm wide, 20mm deep and 35mm high.
This will be the size of the final accessories.

[Normal ver.]

[Lighting ver.]

3. Assumption of Use

In Japan, many people wear traditional clothing such as yukata or kimono during festivals.
Some women wear accessories.
When I imagined these accessories glowing in sync with the atmosphere around them at night, I thought it was very [Kawaii(cute)].
There is also a very large festival held every year in the town where the Fab space is to be opened in 2022.


4. Research Ideas

I looked for examples similar to the accessories I was making.
So I decided to brush up on my ideas based on a few reference examples.

(1) Output Device Idea

(2) Programmable LED Earrings

(3) Peltier element idea(I’m not thinking about this idea now.)

5. Design Sketch

At first, I considered using a Peltier element.
However, I decided that using the Peltier element would make the accessory heavier.
The reason is that I want to keep the weight down to about 10 grams in order to make this accessory a practical design.

I also decided to use an infrared communication system to control the LED lighting pattern of the earrings.
The reason why I didn’t use [ATtiny45] is because of memory problem. The reason why I didn’t use [ATtiny45] is because of the memory problem.
I wanted to prepare [X number] of colors to make some LED lighting patterns.
So I decided to use [ATtiny85], which has a lot of memory capacity.
In order to control analog information such as ambient sound and light sent by infrared communication, I decided to use an ESP32.
The accessory with the ESP32 built in is the [obi clamping].
The ESP32 takes the information received from the light and sound sensors and combines it with the lighting patterns to send the information to the earring side using an infrared communication system.

About Earrings Design

The earring will be ATtiny85 to control the lighting of the Neopixel.
We plan to use 2 x 2 pairs of neopixels for a total of 4.
Two 1.5V button batteries are used to power each accessory.
An infrared receiver (PIC79603) will be installed at the bottom of the accessory to receive the signals from the ESP32.

Parts used

component vender cost(JPY) quanitity total notes
ATtiny85 Akitsukidenshi ¥250 2 ¥500 shop link
Neopixel_WS2813 Akitsukidenshi ¥30 2 ¥60 shop link
Infrared receiver_PIC79603 Akitsukidenshi ¥120 2 ¥240 shop link
Coin battery_LR44/1.5V Akitsukidenshi ¥100 1 ¥100 shop link

About Obi Clasp Design

Inside the obi clasp is a circuit that uses the ESP32 and a 1000mAh rechargeable lithium battery.
The ESP32 also controls an infrared transmitter to read input from the sound sensor, light sensor, accelerometer, and potentiometer and send the information to the side of the earring.
The battery is designed for up to three hours of use.
We have also decided to incorporate a charging circuit to make this a rechargeable device.

Parts used

component vender cost(JPY) quanitity total notes
Wi-Fi module ESP-WROOM-32 Akitsukidenshi ¥550 1 ¥550 shop link
Rechargeable lithium battery(1000mAh) MakerFocus(Amazon) $22.99 1 $22.99 shop link
infrared transmitter_OSI5FU5113A-40 Akitsukidenshi ¥200 1 ¥200 shop link
Sound sensor_WM-61A Akitsukidenshi ¥50 1 ¥50 shop link
Photosensor_L-31ROPT1C Akitsukidenshi ¥200 1 ¥200 shop link
Accelerometer_ADXL345 Amazon ¥720 1 ¥720 shop link
Power switch_SS12D01G4 Akitsukidenshi ¥25 1 ¥25 shop link
Lithium Ion Charging Module_TP4056 Amazon ¥680 1 ¥680 shop link

What parts and systems will be made? What processes will be used?

  • Input device
    ・Photosensor (L-31ROPT1C)
    ・Sound sensor (WM-61A)
    ・Accelerometer (ADXL345)
    ・IR receiver (PIC79603)

  • Output device
    ・Neopixel (WS2813)
    ・Infrared transmitter (OSI5FU5113A-40)

  • Subtractive
    ・Earrings & Obi Clasp Exterior (Laser cutter fabrication)

  • Additive
    ・Obi Clasp Body (3D printer fabrication)

Project Goals and Schedule


Description of Work Breadboard circuit design
Circuit Design
Board Design at EAGLE
Cutting boards with the SRM-20
Program and Verification
Exterior Design
Revision work
Photography and video recording
Preparation of presentation data
Presentation Day

1st spiral

  • The earring is designed to weigh about 10 grams or less.
  • Create a program that makes the accessory glow like a lantern.
  • Use the band clasp as a controller to control the earring’s glow with ambient sound and light.

2nd spiral

  • To further reduce the weight of the earring, it is designed with a flexible substrate and other materials to further reduce the weight of the earring.
  • Neopixel’s light will shine all the way to the back side.
  • Waterproof the earring.
  • Increase the shape of the design.
  • Simplify the design to reduce manufacturing costs (mainly manufacturing time).

3rd spiral

  • Develop workshop kits and courses to make these accessories.