Soft Electronics

Helen Leigh - Watch Now - EOC 2022 - Duration: 38:12

Soft Electronics

Helen Leigh

Abstract Test Your Knowledge Questions & Comments (1)

This talk explores the softer side of electronics, from electronic embroidery and e-textiles to soft robotics and flexible PCB design. We will take a look at some of the exciting technologies in this field, including industrial machines that embroider traces to microcontrollers, open source soft robotics, 'pick and place' sewable LEDs, e-textiles in space, fabric speakers and the world of flexible and stretchable PCB design. I will also share examples of how engineers, scientists and artists are using these soft electronics technologies in their work.

As well as this higher level overview, we will take a look at a number of accessible DIY projects, along with practical tips on materials and techniques, and suggestions for further learning. I will also talk about softness in electronics in a non-literal sense, looking at some cool projects from the community that link emotions, vulnerability and physical computing.

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What key factors did Helen Leigh say you should consider when choosing a conductive thread for a project?

A Only the thread's resistance per foot, since conductivity is the sole important property for all projects.

B Whether you will hand-sew or machine-sew, whether the thread will act as a connector or a long trace (so resistance matters), and how the piece will be worn/washed or handled.

C Only the visual appearance (silver, copper, steel), because aesthetics determine user acceptance more than electrical properties.

D Always choose solderable copper core thread because it is compatible with every sewing machine and every project.

E Pick the cheapest fluffy thread available since it knots well and is fine for tightly spaced traces.

Why did Helen warn against using very cheap fluffy conductive threads in embroidery projects?

A Because fluffy threads are completely non-conductive and cannot pass any current.

B Because the tiny hairs (flyaways) on fluffy thread can create hidden short circuits between nearby traces.

C Because fluffy threads cannot be hand-sewn and will break instantly under a needle.

D Because fluffy threads always melt when touched by skin and are unsafe to wear.

E Because fluffy threads are banned from industrial embroidery machines for legal reasons.

What practical technique did Helen recommend to avoid intermittent or failed connections when sewing components into a fabric circuit?

A Rely on a single long loose stitch under the component so it can flex without breaking.

B Use three tight stitches and flip the embroidery hoop to check the underside for loose dangling threads or knots that could short.

C Always glue the entire underside with hot glue instead of inspecting stitches, since glue is a permanent fix.

D Solder every stitch directly to prevent any sewing-related electrical failures.

E Use hairspray on the underside as the primary method to electrically insulate and secure connections.

What property of 'moss' (tufted) embroidered electrodes makes them especially useful for wearable medical sensors, according to Helen?

A They are completely rigid and therefore hold electrodes perfectly still against the skin.

B They provide a very high surface area and compress against skin in garments, improving contact so gels or adhesives aren't needed.

C They are cheaper than any other electrode type because they use no conductive material.

D They convert motion into electrical power, so no external battery is required for sensing.

E They are designed to be detachable like sequins so they can be swapped out mid-use.

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Brandon

Score: 0 | 4 years ago | no reply

Are there any unique power consumption or heating issues while making some of your products but specifically anything someone would wear?

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