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The device was tested in a variety of real-world situations, including in the presence of a water spray, such as might exist in the shower, a rainstorm, or during vigorous athletic activity. This means no batteries or other external power components are required, rendering the HMI more environmentally friendly and sustainable. The power required to run the HMI comes from the wearer's movements. "Due to these compelling features, the device can be adopted for human-body powered HMI by transforming human biomechanical activities into electrical signals." "Owing to the material's flexibility and durability, the magnetoelastic sensor array can generate stable power under deformations, such as rolling, folding, and stretching," said author Jun Chen, from UCLA. These coils respond to the magnetic field changes and generate electricity through the phenomenon of electromagnetic induction. The second component is a magnetic induction layer consisting of patterned liquid metal coils. It consists of a set of micromagnets in a porous silicone matrix that can convert the gentle fingertip pressure into a magnetic field variation. The first component is a layer that translates mechanical movement to a magnetic response.
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The device is based on a soft magnetoelastic sensor array that converts mechanical pressure from the press of a finger into an electrical signal.
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In Applied Physics Reviews, by AIP Publishing, scientists at UCLA describe their development of a type of HMI that is stretchable, inexpensive, and waterproof.
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