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Arm

SpokeSpice·Hardware·Arm/A/Arm.kicad_pcb

Arm PCB layout, top view — open source board by SpokeSpice

About the Arm PCB

Arm is an open source PCB design by SpokeSpice, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 87.7 × 254.8 mm, with 36 components from 3 distinct parts.

Other key parts include the SM351LT. By type, the board carries 32 diodes, 2 ICs and 2 connectors.

It belongs with the wearables, displays & leds and power & battery designs in this gallery.

From the project

Schematics and layouts

The project is divided into two parts, the controller and the arms. Typically a system would have 4 arms, each running at an angle of 90 degrees to the next.

This repository contains the KiCad project files for the controller and the arm PCBs.

The controller board is based on the ESP32 microcontroller and features a USB-C connector for programming. It features a battery holder for an 18650 Li-Ion cell, a 3.3V LDO regulator, an SD card slot and 4 connectors for the arms.

Arm, from the project README
From the project README

Main components on the Arm

SM351LT

Arm bill of materials (BOM)

36 components, 3 distinct parts.

QtyPartRefs
2
SM351LT
U1, U2
2
Conn_01x04
J1, J2
32
WS2812B
D1, D2, D3, D4, D5, D6, D7, D8 +24

Arm design files

The KiCad project lives in the SpokeSpice/Hardware repository on GitHub; these links point at the commit this page was built from.

Arm: common questions

How big is the Arm PCB?

The Arm measures 87.7 × 254.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Arm?

36 components, from 3 distinct parts. The full bill of materials is listed on this page.

Where can I download the Arm design files?

From the SpokeSpice/Hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Arm design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which SpokeSpice chose for the repository.

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