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Intermediate build

How to build Pedro 2.0

4-DoF desktop robot arm · Intermediate

Build Pedro, a small 3D-printed 4-servo STEM robot arm with its own ATmega32U4 board, Arduino firmware and free classroom lessons. OSHWA certified FR000025.

Start the buildProject files
Difficulty
Intermediate

Some soldering, calibration and Linux comfort needed.

Build time
2–4 weekends

Our estimate, part-time

Parts cost
Not published

Price the BOM yourself

Degrees of freedom
4

Apache-2.0

What is Pedro 2.0?

Pedro is a small, 3D-printed four-servo arm for schools and beginners, created by almtzr and OSHWA-certified as FR000025. It's an ecosystem rather than a single model: the printable parts, the controller board, the firmware and the STEM lessons each have their own repository.

The Pedro board is an ATmega32U4 design programmed like an Arduino Pro Micro. Its on-board buttons select and move each servo, so you can drive the arm without a computer.

Pedro 2.0 specifications

Servos
4 (pins D5, D6, D9, D10)
Controller
Pedro board (ATmega32U4)
Programming
Arduino IDE
Print
40% infill
Certification
OSHWA FR000025

Figures as published by the project. See Sources below.

Bill of materials

PartQtyNotes
Hobby servos4
Pedro board1Gerbers provided
3D-printed parts—
Power source—
Where's the full bill of materials?

The full BOM, with exact quantities and vendors, lives in the project's own files. Prices change often, so treat Not published as a ballpark. Start at the project repository.

Tools you'll need

  • 3D printer
  • Small screwdrivers
  • Arduino Pro Micro (as ISP)
  • Arduino IDE

Step-by-step build overview

Electronics & wiring overview

The servos plug directly into the board headers. The buttons sit on analog pins.

DC power supplypower sourceLaptop / PChigh-level controlEncoderssensingArduino boardreal-time controllerServo bus adapterdrivers / bushobby/smart servos4 joints / motors
PowerData / commandsSensor feedbackOverview only. Follow the project's own schematic for pinouts and voltages.

Software

Arduino IDEURDF model

PedroFirmware for the Arduino IDE, plus a repository of STEM lessons.

Tips from the bench

  • ☕ Burn the bootloader first, or the board won't show up in the IDE.
  • ☕ Follow the per-part support settings.

Pedro 2.0 FAQ

Is Pedro good for kids?

Yes. It's designed for STEM classes.

Is it open source?

Yes, and it's OSHWA-certified (FR000025).

Sources

Written by Bots n' Beans from the project's own documentation. Check the sources for the latest revision before you buy parts.

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