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Fmg wearable

leoswartzburg·fmg-wearable·hardware/pcb/FMG-Wearable.kicad_pcb

Fmg wearable PCB layout, top view — open source Nordic nRF board by leoswartzburg

About the Fmg wearable PCB

Fmg wearable is an open source Nordic nRF PCB design by leoswartzburg, published on GitHub under the MIT license. It is a 2-layer board measuring 22 × 35 mm, with 3 components from 3 distinct parts.

Its main chip is the XIAO-nRF52840-Plus-SMD, from the Nordic nRF family. By type, the board carries 2 resistors and 1 IC.

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

From the project

Open-source force myography (FMG) wearable: custom PCB, TPU band, firmware, and a browser game you fly by squeezing

A forearm band that reads muscle activity mechanically. When a muscle contracts it bulges; a force-sensitive resistor pressed into the muscle belly turns that bulge into a continuous control signal. Add the onboard IMU and you get squeeze force + arm orientation from one small board.

▶ Build video: I Built a Force Myography Wearable from Scratch — and Played a Video Game With It

Fmg wearable, from the project README
From the project README

Main components on the Fmg wearable

XIAO-nRF52840-Plus-SMD

Fmg wearable bill of materials (BOM)

3 components, 3 distinct parts.

QtyPartRefs
1
XIAO-nRF52840-Plus-SMD
U1
1
10K
R1
1
R
R2

Fmg wearable design files

The KiCad project lives in the leoswartzburg/fmg-wearable repository on GitHub; these links point at the commit this page was built from.

Fmg wearable: common questions

What microcontroller does the Fmg wearable use?

The Fmg wearable is built around the XIAO-nRF52840-Plus-SMD, from the Nordic nRF family.

How big is the Fmg wearable PCB?

The Fmg wearable measures 22 × 35 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fmg wearable?

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

Where can I download the Fmg wearable design files?

From the leoswartzburg/fmg-wearable repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Fmg wearable design in my own project?

Yes, under the terms of its MIT license, which leoswartzburg chose for the repository.

Can I test firmware for the Fmg wearable without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.

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