Desk Companion Assembly Guide

Wiring Diagram

Base desk companion robot wiring: ESP32-C3 + OLED + touch sensor

The first step is to wire the 0.96-inch or 1.3-inch OLED display, the ESP32-C3 and the capacitive touch sensor together. This is the base electronic assembly for the Desk Companion robot.

Display: GND to GND, VCC to VCC (3.3V), SCL to GPIO9, SDA to GPIO8
Touch sensor: VCC to VCC (3.3V), GND to GND, OUT to GPIO7
Color guide: red = VCC 3.3V, black = GND, yellow = GPIO

Important

ESP32-C3 placement check

Make sure the ESP32-C3 is placed correctly on its breakout board. Use the 5V pin as a visual reference and verify that the USB-C port is on the same side as the blue header pins marked 5V.

Use the 5V pin marking as your first check point
The USB-C connector should sit on the same side as the 5V header row
If orientation is wrong, the wiring diagram will not match the build

Components

Basic build parts used in this version

ESP32-C3 Super Mini
OLED display 0.96"
OLED display 1.3"
Capacitive touch sensor
Dupont cable
Vibration motor module optional for the base project, added for extra expressiveness

This page covers the basic build with the ESP32-C3, the 0.96-inch or 1.3-inch OLED display and the capacitive touch sensor. A vibration motor and a piezo buzzer can be added later to make the desk companion robot more expressive.

Go to firmware steps

Firmware Install

Flash the firmware for the basic build

01

Open the firmware page

At this stage of the assembly, you can already install the firmware on the ESP32 to verify that everything is working correctly. Connect your ESP32-C3 to your computer with a USB-C cable, then open the main site.

02

Click "Install the firmware"

Click the install button on the website and select your ESP32-C3 board when it appears in the browser device list.

03

Select the board

Choose your board from the serial device picker and connect to it to continue the flashing process.

04

Click the installer entry

Click the text shown in the installer window, "Install Yeti / C309 Web Installer", to start the installation process.

05

Wait for installation to finish

Finish by launching the installer and wait for the success message. Once it is done, the process is complete and the selected OLED display should show the expected setup screen.

Quick setup

Finish the first configuration

After the firmware is installed, the Desk Companion still needs one short network setup before the main control page becomes available.

Connect to Yeti_Config

After reboot, join the Yeti_Config Wi-Fi network from your phone or computer.

Open the config page

If the portal does not open automatically, go to 192.168.4.1 in your browser.

Choose your Wi-Fi

Scan for networks, select your Wi-Fi and enter the password.

Set local name and screen

Choose the .local address and select the OLED model used by your build, with 0.96" as the default option or 1.3" if needed.

Connect and reboot

Click Connect, then wait for the Desk Companion to restart on your Wi-Fi.

Open the control page

Open your chosen .local address to access the main interface and test expressions.

On this screenshot, the Yeti name has been changed to "kitty".
To access the interface, you would open "kitty.local".

Go further

Optional vibration motor and piezo wiring

Once the base build is working, you can add the vibration motor and the piezo module for a more expressive desktop companion.

Extended assembly diagram with optional modules

Module	VCC	GND	Signal
Piezo buzzer	3.3V	GND	GPIO5
Vibration motor module	3.3V	GND	GPIO10

These two modules are optional and are added on top of the base build shown earlier in this guide.