RoboPrime

RoboPrime is a full-featured 21-DOF, 3D-printed bipedal humanoid built around a $10-class Arduino Pro Micro (ATmega328p). Every joint is an MG90S 9g micro servo, driven through a pair of 74HC4017 Johnson decade counters that let a single microcontroller address up to 20 servos over one interrupt-driven serial-servo channel — a clever hack that avoids needing a dedicated servo driver board. An HC-05 Bluetooth module gives wireless serial control from a phone or PC, and an onboard MPU-6050 IMU is present in hardware for future balance work (unused in the shipped firmware).

Two full physical builds (v1 and v2) exist with photos, plus a soldered custom carrier board, hand-wired point-to-point on protoboard. The firmware implements a small command language (S0-S3, Q0, C0) for single-servo moves, timed sweeps, queued/synchronized movement planning, and calibration, plus three working hardcoded animations: Hello (wave), Sit Down, and a cheeky third gesture. Walking gaits are stubbed in the animation table but marked work-in-progress by the original author.

Built by Simone Primarosa (simonepri) and shown at Maker Faire Rome. Originally documented as a high-school capstone project (write-up in Italian, linked from the source README).

This orobot.io program is a control-interface port — it re-expresses the original robot's home/hello/sit-down/stand-up choreography using orobot's motor/pose/sequence model so you can drive RoboPrime from the browser Operator panel. The original ATmega328p + HC-05 firmware is not orobot-firmware-compatible out of the box; see Required Hardware below. Full source (firmware, wiring, 3D models) is on GitHub.

Source: https://github.com/simonepri/roboprime License: GPL-3.0 (project) / MIT (firmware files) Original author: Simone Primarosa — https://github.com/simonepri