EZ-Inmoov Robot Head by EZ-Robot & Gael Langevin

EZ-InMoov robot head-DIY educational humanoid kit powered by Synthiam ARC for vision tracking, speech, chatbot integration and mobile control

Connection Type

Wi-Fi

Number of Servos

Audio Support

Yes

Camera Support

Yes

UARTs

None

I2C Support

Yes

ADC Ports

Digital Ports

Manufacturer's Page Getting Started Guide Source Files

The EZ-InMoov Humanoid Head is a do-it-yourself (DIY) educational robot head designed for learning and experimenting with robotics, AI, and human-robot interaction. It is based on (and compatible with) the popular open-source InMoov head by Gael Langevin, but updated and simplified to work smoothly with Synthiam ARC software and the EZ-Robot IoTiny controller.

What This Kit Is (Beginner Explanation)

Think of this kit as a “robot head platform” you build and then bring to life with software:

You 3D print the head parts (or use parts you already printed).
You assemble the mechanics (eyes, jaw, head rotation) using included screws/hardware.
You plug in servos, camera, speaker, and battery to the IoTiny controller (no soldering).
You run ARC on a computer to control movements, voice, vision tracking, and AI/chatbots.

Why Use the EZ-InMoov Robot Head?

Educational value (hands-on learning): Great for beginners who want a real robot project that teaches wiring, servos, sensors (camera), and software-based AI. You can experiment with modern conversational AI such as OpenAI GPT (via ARC skills).
Research and classroom friendly: Useful for demos and university-level projects focused on human-robot interaction (speech, face tracking, conversation).
Beginner-friendly assembly: Designed to be plug-and-play with included electronics—no soldering required.
Customizable (open 3D files): The 3D printable design is open and easy to remix—change colors, add mounts, modify faceplates, etc.
Powerful software features: Synthiam ARC supports vision tracking, speech recognition, text-to-speech, and chatbot integration.
Multiple programming options: Control the robot with Blockly (drag-and-drop), JavaScript, or Python.
Mobile control option: You can control the robot head from a mobile device (helpful for quick tests and demos).
Emotion/face research: ARC can integrate with cloud services (such as Microsoft Cognitive Services/Azure) for experiments like emotion detection.
Portable or stationary power: Use the included battery for portability or a wall adapter for continuous runtime.

Key Features (What You Actually Get to Do)

Seamless integration: Designed to attach easily to an InMoov body (if you expand later).
Complete electronics package: Includes controller, camera, servos, battery, charger, and wiring harness.
Simplified mechanical design: Fewer parts and a unified internal bracket to reduce build complexity.
Self-contained build: Electronics and battery fit inside the skull for a clean look and portability.
Expressive motion: Head left/right, eye pan/tilt, and jaw open/close for speaking animations.
Improved audio: Ported voice box design with a small speaker for clearer sound.
Wireless control: IoTiny provides wireless connectivity for control through ARC.
AI experimentation: Vision tracking, speech, and chatbot skills can be combined into a single project.

Before You Begin (Beginner Checklist)

You will need: 3D printed parts, a computer to run Synthiam ARC, and basic time/patience for assembly.
No soldering: All electronics connect with plugs.
Work area: A clean table and a small container for screws helps a lot.
Safety: LiPo batteries must be charged and handled carefully (see Battery Charging Instructions below).

Downloads

Details (What Makes This Kit Useful)

The EZ-InMoov Robot Head is a strong choice if you want a project that is approachable for beginners but still powerful enough for advanced AI experiments. You can start with simple goals (move the jaw, look left/right, say a phrase) and then grow into more advanced features (face tracking, conversation, voice-controlled commands, and cloud AI services).

Getting Started in ARC (Beginner Overview)

Install Synthiam ARC on your computer.
Power the IoTiny (battery or wall adapter) and connect it to ARC over WiFi.
Load an example project (basic or advanced) to verify everything works.
Test movement safely: Run an “Auto Position” or servo test slowly to confirm nothing is binding.
Calibrate servos to 90° (center position) before final tightening of horns/links for best range of motion.
Try one feature at a time: camera first, then jaw talking, then speech recognition, then chatbot AI.

EZ-InMoov Robot Head FAQ

Use PLA with a 0.4mm nozzle, 2 shells, and 30% diamond or grid infill. Print with a raft and no supports. Parts that need support have custom supports built into the design.

Beginner tip: If parts feel weak, increase shells (e.g., 3–4) before increasing infill.

Print time depends on printer speed and reliability.

Two printers at ~150 mm/s: about 2–3 days
One printer at ~60 mm/s: about 5–7 days

No. The kit is designed to be plug-and-play.

Yes. For stationary use, you can use a 7.5V power adapter.

Beginner tip: If your robot is on a desk for demos, wall power is often simpler than managing battery charge cycles.

When the head moves, wires can snag and pull partially out of connectors.

Power off the robot.
Check that the camera and servo plugs are fully seated in their ports.
Reroute wiring to reduce tugging during motion.

Recommended routing: run wire straight over the jaw pivot cup and back to the IoTiny. Put extra wire length into the cavity at the back of the skull.

The EZ-InMoov projects often include software servo limits to prevent printed parts from colliding. If a servo “hits a limit” too early, the servo horn may not have been installed at the correct centered position.

Fix (high level):

Use the IoTiny internal webserver to set servos to 90° (center).
Loosen/remove the horn, re-center it mechanically, then reassemble.
Re-test slowly in ARC before full-speed movement.

Options:

Fill the hole with a small amount of hot glue and reinsert the screw carefully.
Use a 3D printing pen to add plastic back into the hole.
Very carefully deform the hole with heat (risk: warping the part).
For repeat builds, pre-thread holes with an M3 tap.

Prevention: Tighten screws until snug, not “as tight as possible.”

3D printed parts can crack over time. You can:

Repair with cyanoacrylate (super glue) or 3Dgloop.
Reprint the part with more shells and/or higher infill for strength.

Prevention: Avoid over-tightening screws; snug is enough.

Most commonly, the micro deans connector between the battery and IoTiny is slightly loose. Follow the adjustment guide here: https://www.ez-robot.com/learn-robotics-power-pin-adjustment.html

These skills require internet access. Typically you need:

WiFi connection #1: Computer ↔ IoTiny (robot network)
Internet connection: Computer ↔ internet (Ethernet or a second WiFi adapter)

A USB WiFi dongle is included to help create a second WiFi connection.

The basic example project is primarily English-focused (PandoraBot + Windows speech). Changing it to another language can be difficult.

The advanced project uses OpenAI GPT and Bing Speech Recognition, which support additional languages. You can change language options in the Bing Speech settings. For text-to-speech, Windows may require installing additional language packs. For more flexibility, try the Microsoft Azure Text-to-Speech skill.

ARC Project Details (What’s Inside the Example Projects)

Basic Head Project

Includes common core skills such as:

Camera Device
Speech Settings
Speech Recognition
Auto Position
PandoraBot
Soundboard for PC
Soundboard for EZB
Talk Servo v2

Advanced Head Project

Builds on the basic project and adds skills like:

Conversational Menu
Bing Speech Recognition
OpenAI ChatGPT

The EZ-InMoov Head Contents

1 × IoTiny Smart Robot Controller with Speaker
1 × EZ-B Camera
2 × Heavy Duty Servos (Digital)
2 × Micro HDD Servos
1 × LiPo Robot Battery
1 × LiPo USB Battery Charger
1 × Alternate Power Adaptor Connector with Micro Deans
1 × Wiring Harness
1 × USB WiFi Dongle
1 × Hex Driver (assembly tool)
All necessary hardware (screws, mounts, etc.)

Technical Specs

Battery Output	7.4V 1300mAh
Charger Input	5V 2A
Charger Output	7.4V 1000mA
Charge Time	~2.5 hours (with USB charger + 5V 2A power supply)
IoTiny Ports	8 × digital I/O, 2 × ADC, 1 × I2C, 1 × Camera
Ports Used (typical head build)	4 × digital I/O, 1 × Camera
Movement	Head left/right, eyes pan/tilt, jaw open/close
HDD Servo Torque	19 kg·cm @ 7.4V
Micro Servo Torque	7 kg·cm @ 7.4V

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Nomad 6R

PRO

Belgium

#57 Dec 2023 — Edited Jan 2024

hi all

some great progres ,its working . if you do this make sure not to go over the settings. servo d4 is the front servo . it tends to tip over when making side ways motion . this way its very limited for that tip over . how to connect the two side pistons. calibrate bolt servo's and then aline one piston and base ( hole ) put a screw in . then aline the other piston but disconnect the iotiny first . you need to turn by hand , the previeus piston to be able to get second piston in . print the cross connection with 35 infil and the gyroid , in your slicer to make strong parts . things to do is the jack plug holder . i'm gonna make , a tab so you can screw it on the back skull , little more steddy . please remember am a hobby designer , check the parts .

Download: basesmalpistonIN.zip

DJ Sures

PRO

Synthiam

#58 Dec 2023

@Nomad, you should publish your remix and files as a tutorial or a robot. That way people will be able to find it. It will get lost in this lengthy thread in a few days, and no one will see it again.

Nomad 6R

PRO

Belgium

#59 Dec 2023

@dj

thank you for the tip . i will do that . what do you think of this remix ?

Nink

PRO

Canada

#60 Jan 2024 — Edited Jan 2024

I see Gael has a new robot head he just announced (and hands) called the i2 Head Now has eyelids, teeth, brow and various other facial movements. You can also print an inner and outer mold and then make a silicon face. I guess I need to start printing again.