1/20/2026 - Designing Schematics

Hello all
Now I wanted to make a dasai mochi for my study desk.
I wanted it to have a cute OLED screen face, a sound (perhaps it can turn on some music (?) yeah I will try that.

I used the Seed Xiao ESP32C3 as my main board

I am kind of struggling to understand the ESP32C3 pins and function.
I used this guide to design my schematics
https://wiki.seeedstudio.com/XIAO_ESP32C3_Getting_Started/

Update: I think after this Iwanted to focus on the code and 3D design because I don't think printing a PCB is necessary here, I can just connect the components using wires

1/23/2026 - Determining the components

Hello so as I am not gonna design like PCB for this project (it is not necessary to design it -- and I wanted it to be more flexible—cutting cost also), So, I'm just going to list the components that I will used

1. XIAO Seeed ESP32C3
2. OLED display 128 x 64 px
3. Type-c charging battery module
4. TTP223 Touch Button Module
5. Buzzer loud bottom speaker samsung
6. Copper wires
7. On-Off Mini Slide Switch 3pin 1P2T

1/25/2026 12 PM - Animating the face

Hellooo
So, this time, I animated the happy face using Rive Editor
This is a new animating editor for me, and I am learning it from scratch.
At first, the tools is really confusing like you have to expand some thingy several times before the tools that you need appear. I use mostly the trim effect here.
The animation turn to be great and smooth (even though it's kind of simple), but I am happy with it.

I follow this tutorial: https://www.youtube.com/watch?v=QOoszpg0BsM
I think I wanted to use their animation as the normal face animation, if that was allowed.

1/25/2026 2 PM - Code the program

Code! Finally.
After finishing up the animation, I convert it to bitmaps using this: https://javl.github.io/image2cpp/
Then, I directly code the program. Nothing much happen I think..
(I haven't tested the code yet. I am going to test it later with Wokwi, at least the buzzer and OLED display, as I check that it doesn't have a feature to simulate touch sensor.)

1/26/2026 - 3D Design

Helloo
So, my dasai mochi 3D design will be separated to two parts
The first part is the top one, and the second is the bottom one.
I currently finished my top Dasai Mochi parts..
I done this design by first sketch it on paper (This is what I do first so that I can really know how long the exact thing gonna be, learning from my experience designing the pcb, what I thought big, turned out to be not the size what I expected initially.)

The fixed sketch:

Oh yeah, don't forget to also see the spesification on components that you are designing. I took kind of long time deciding the length, width and height..

Then, after deciding the measurement, I started working on Fusion 360.
So the feature that I add is a hole for the type C charge came in, then, The hole for the OLED display, hole for the heat set insert (After some times searching how to make hinges in youtube, I think better I just used heat set insert instead, as it is more reliable and strong)
I also insert a hole in the top part for the cable that will be connect to the touch sensor

After some time I designed the bottom part, pretty simple I guess

1/27/2026 - Update audio connection

Guys,
After, I search some things about audio module connection with ESP32. I just know that it need an amplifier module. If not either the speaker doesn't turn on or the ESP32 will be fried

I watch this tutorial on youtube: https://www.youtube.com/watch?v=a936wNgtcRA
I think I am gonna use the: MAX98357A Audio amplifier, as recommended by that person.

This is my update schematic design: