Elastic Electric/Data/USB Cables

Elastic Electric/Data/USB Cables via the Adafruit forums.


Somewhat related!

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Conductive Rubber Cord Stretch Sensor + extras! Measuring stretch forces isn’t easy – unless you have some conductive rubber cord! This cord is 2mm diameter, and 1 meter long, made of carbon-black impregnated rubber. Usually this material is used for EMF gasketing, but its also very fun to play with.

In a ‘relaxed’ state, the resistance is about 350 ohms per inch. As you pull on it, the resistance increases (the particles get further apart). As you stretch it out, the resistance increases linearly. So lets say you have a 6″ piece – thats about 2.1 Kohms. Stretch it to 10″ long and now it is 10″/6″*2.1K = 3.5 Kohms. You can stretch the rubber about 50-70% longer than the resting length, so a 6″ piece shouldn’t be stretched more than 10″. Once the force is released, the rubber will shrink back, although its not very ‘fast’ and it takes a minute or two to revert to its original length.

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This stuff is fun, so we give you a full meter and also two alligator clips (to connect to the cord) and a 10K resistor. Together, you can use these to make a simple voltage divider. Then use our handy Thermistor tutorial to measure the analog voltage and convert that back to resistance.

In stock and shipping!


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2 Comments

  1. Wow, this is really cool and innovative! I definitely look forward to seeing this in use on products.

  2. Can’t wait to see this under “new products.”

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