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Step 8Cut and Sew chest strap and attach the stretch sensor.
The basic idea here, is that a fabric strap is wrapped around the chest by the lower ribs (where the most motion occurs). The stretch sensor bridges a small gap in the chest strap, the rest of which is not stretchy, so breathing, subsequently deforms the sensor as needed.
You'll have to measure the length of strap to your individual body type. I sewed an extra strip of fabric around the strap, so the wires can safely sit inside. In the front, where the stretch sensor connection is, I sewed a 'sleeve' of fabric that would loosely cover the sensor so it wouldn't get rubbed or damaged.
In the back of the chest strap, I made a simple shape (like on a backpack) for tightening and loosening the strap. I had the shape laser-cut out of clear acrylic (see image), but you can make it any way you are able to.
You'll have to measure the length of strap to your individual body type. I sewed an extra strip of fabric around the strap, so the wires can safely sit inside. In the front, where the stretch sensor connection is, I sewed a 'sleeve' of fabric that would loosely cover the sensor so it wouldn't get rubbed or damaged.
In the back of the chest strap, I made a simple shape (like on a backpack) for tightening and loosening the strap. I had the shape laser-cut out of clear acrylic (see image), but you can make it any way you are able to.
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