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Tiny Engineer

A small desktop robot that moves, changes its face, and rings a bell as an AI coding assistant reads files, writes code, and finishes tasks.

  • Home
  • Open source
  • arduino
  • 3D printable

Suggested by Robotheca, created by @jamro (opens in a new tab), from github.com/jamro/tiny-engineer (opens in a new tab). Pinned to commit 8821a07 (opens in a new tab).

Fork on GitHub (opens in a new tab)Download the files at this commit (.zip)
Hardware license
CERN-OHL-S-2.0 (opens in a new tab)
Software license
MIT (opens in a new tab)
Commercial use
Allowed

This repository contains executable files that Robotheca doesn't check. Only run them if you trust the creator.

Which files (1 file marked executable, 2 scripts)

Photo and 3D model

Tiny Engineer, photo from its repository
Photo:@jamro (opens in a new tab)CERN-OHL-S-2.0source file (opens in a new tab)

3D preview converted from github.com/jamro/tiny-engineer at 8821a07, under CERN-OHL-S-2.0. View the original files from GitHub (28.6 MB) (opens in a new tab)

Power
5 V

What it can do

Written by Robotheca from the project's documents.

  • Moves its head, neck, arms and body using five micro servos
  • Changes its face shown on a small OLED display
  • Plays sounds such as a bell ring through a speaker
  • Runs animations triggered by HTTP POST requests from a coding agent or script
  • Joins home Wi-Fi and exposes a REST API and web UI
  • Integrates with coding agents such as Claude Code, Cursor and Antigravity via a command-line setup

Bill of materials

This repository has no parts list Robotheca can read yet.

Build guide

The creator's steps, each with its instructions.

  1. 1Print the 3D parts
  2. 2Order or build the main control board
  3. 3Connect the ESP32, servos, OLED, and speaker to the main control board
  4. 4Flash the firmware
  5. 5Assemble the printed parts
  6. 6Connect to Wi-Fi and hook up your coding agent

The guide appears here as you scroll.

Guide by @jamro (README.md), under CERN-OHL-S-2.0 (hardware) and MIT (software).

More guides

Wiring and electronics

Notes written by Robotheca from the project's documents.

Main parts

  • ESP32-C3-Zero microcontroller board with Wi-Fi
  • Main control board (open-source KiCad design) carrying the ESP32, servo headers and OLED header
  • Five SG90-type micro servos for head, neck, arms and body
  • Waveshare OLED display
  • Speaker driven by a MAX98357A amplifier
  • PCA9685 servo driver as an optional modular alternative
  • USB-C breakout as an optional modular alternative
  • Onboard LED on the ESP32 used as a status indicator
  • 5 V power supply rated at least 2 A via USB-C

Connections

  • Servos plug into labeled headers on the main control board, or into a PCA9685 in the modular build
  • PCA9685 channels: 0 head pitch, 1 neck yaw, 2 left hand, 3 right hand, 4 body
  • OLED cable plugs into its header on the board or the harness
  • Speaker connects to SPK+ and SPK- on the board, using either a connector or solder pads, never both
  • ESP32 seats into board headers from above, oriented by the USB marking on the PCB
  • Power enters through the board USB-C port at 5 V and at least 2 A

Schematics, boards and diagrams