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A breathing sensor / respiration belt by @kobakant

Kobakant.at presents a very simple solution for capturing the movement of the chest or stomach breathing, using a stretch sensor knit from a stainless-steel & polyester “sensor yarn”.

How does it work?

The stainless steel fibers in the yarn are short, and the electrical resistance between them is high (when relaxed <1M Ohm). And when you stretch the yarn the resistance goes down bellow 1K Ohm (depending on the length of yarn you are measuring across).

Read more, Arduino code, and more photos


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