EMOtto_ESP32 DIY

                                                                 EMOtto_32 DIY

Update — September 30, 2026

Added the EMOttoESP32_2_0_Printables_senza_librerie.zip package, containing updated instructions and an app project (.aia) editable with MIT App Inventor.
The EMOttoDIYLib.zip and TFT_eSPI.zip libraries can be downloaded separately from the page attachments. The previously published Android app remains available.
Audio tracks 4, 31, 35, 36, and 37 are excluded due to copyright. The firmware has not been modified.
To get started, extract the package and read LEGGIMI.md.

EMOtto_32, makes sounds, talks, sings, dances and moves, changing expressions depending on the emotion. After a while without touching it, it falls asleep. But just touch it and it wakes up! It can be controlled thanks to 2 Touch or via Android App. It avoids obstacles and chases you thanks to the VL53L0X module.

Welds not necessary if you use pre-welded VL53L0X  and  TTP223 component.

                                                                Emotions Included:

1. Happy (Moves eyes and blinks)

2. Angry

3. Nostalgic

4. Sad (Moves eyes and blinks with tears falling) In Love (with pulsating heart-shaped eyes)

5. sleep (With mouth movement and zzz animation, yawns and snores thanks to MP3s on the micro SD card)

6. Disgusted

7. Embarrassed

8. Fearful

9. Anxious

                                                                   Modes Included:

1. Chase

2. Avoidance

3. Dancer (4 Songs)

4. Singer (4 Songs)

This Template Uses the Modified ElectronBot Emo Project as a Design: https://github.com/maker-community/ElectronBot-Peripheral/tree/main/ElectronBot%20EMO .

Thanks to Scotty Franzyshen and his Concepts:

https://www.tinkercad.com/users/9Wbn1uShxa2-scotty-franzyshen, that inspired me.

The code uses the Modified Ottodiy library for Movements and Sounds:

https://github.com/ottodiy
Thanks to the fantastic project by Camilo Parra Palacio: https://github.com/cparrapa 

and to the site:
https://www.ottodiy.com/.

We recommend using an FDM 3D printer.
No supports or rafts are required for the feet and legs. Supports are required for the other components.
Resolution: 0.3 mm or 0.2 mm for better resolution.
Infill density: 15%

All Stl files are already positioned correctly for Slicers

                                                                    Characteristics

• 👩💻 Customizable Programming with Arduino

• 👣It moves

•  Change Expression

• 🔊 Makes sounds

• Walks

• Dances

• Sings

• Avoids Obstacles

• Chases You

• Sleeps

• Touch Control

• App Control

                                                                 Parts list

(All the necessary materials can be purchased on Aliexpress)

• 🖥 Microcontroller ESP32 + SHIELD I/O (aliexpress)

• 🔌 cable micro USB - or USB-C 

• 🔋  7.4V 1200mah Battery Lipo  

• Chrager for Lipo Battery

• UBEC 5V-3A (aliexpress )

• Switch 6 pin

• ⚙ 4x micro servo motors with screw sets.

• 🔊 Passive Buzzer Ø12mm

• Round Display  GC9A01

• 🌈  DuPont female-female jumper cables 10cm

• 2 Touch Capacitive TTP223

• Sensor VL53L0X (aliexpress)

• DFplayer Mini

• Micro SD card  32GB

• 8R 2W 20mm, DuPont line 2.54( or eqivalent 8 ohm Speaker)

• 1k resistence for  RX DFPlayer Mini

• Magnetized Phillips screwdriver

• 3D-Printed Head 

• 3D-Printed Headphones 

• 3D-Printed Legs (2)

• 3D-Printed Feet (2)

                                                                   CONNECTIONS

ATTENTION! :

Power is essential for proper operation!

To get a clear idea of the various options for powering your Otto project, you can follow this guide. (I've tried them all over time with varying success.)

The robot won't function properly without battery power. The cable connected to the PC isn't sufficient.

• Use a 7.4V 1200mAh rechargeable Lipo battery.

• Connect it to the 5V 3A UBEC.

• Place the shield jumper on 5V.

• Connect the UBEC to the 5V of the shield as shown in the figure.

• Connect the GC9A01A VIN to the 3.3V.

                                                                                    WIRING 

                                                                  Scheme

                                                                     CODE

Arduino IDE -ESP32 Board Manager

Install from File/Preferences/Settings/Additional URLs screen for Tab Manager:

https://dl.espressif.com/dl/package_esp32_index.json,https://espressif.github.io/arduino-esp32/package_esp32_index.json

For operation, it is necessary to install the following libraries. Aside from EMOttoDIYLib, the others can be installed directly from Arduino IDE, or from GitHub.

• EMOttoDIYLib (Arduino Ide , Menu/Sketch/Include Library/Add Zip Library)

• Adafruit GFX Library

• Adafruit_GC9A01A

• TFT_eSPI(setup 200)

• Adafruit_VL53L0X

• DFRobotDFPlayerMini

Dedicato a  Mio Figlio FRANCESCO……………