S.BatessChangePurse History

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February 17, 2010, at 07:03 PM by Sarah Bates - Description of change purse with stretch sensitive rim.
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The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the lid, the LED may tilt up as opposed to down into the purse. This could be fixed by pushing the LED farther into the purse and bending it further into the purse before sewing down the mounts. Finally, the lid requires a hook on the inside to clasp the purse closed during transit.

to:

The movement of the lid was neglected in the design, so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the lid, the LED may tilt up as opposed to down into the purse. One solution might be pushing the LED farther into the purse and bending it further into the purse before sewing down the mounts. Finally, the lid requires an inside hook to clasp the purse closed during transit.

February 17, 2010, at 07:00 PM by 18.111.13.249 -
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The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 kilo-ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

to:

The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 kilo-ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded. When a conductive thread was used (as in connecting the battery terminal to the rest of the circuit), at least one other path was also sewn. This ensures that even if the purse experiences a small tear, the circuit may still survive.

Changed line 33 from:

The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the

to:

The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the lid, the LED may tilt up as opposed to down into the purse. This could be fixed by pushing the LED farther into the purse and bending it further into the purse before sewing down the mounts. Finally, the lid requires a hook on the inside to clasp the purse closed during transit.

February 17, 2010, at 06:34 PM by 18.111.13.249 -
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  1. Snap purse flab to back of purse
to:
  1. Snap purse flap to back of purse
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The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 k ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

to:

The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 kilo-ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

Changed line 33 from:

The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts.

to:

The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts. Also since the LED is sewn onto the same fabric as the rest of the

February 17, 2010, at 06:30 PM by 18.111.13.249 -
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http://newtextiles.media.mit.edu/uploads/S/Summary1.jpg

to:

http://newtextiles.media.mit.edu/uploads/S/Smaller1.jpg

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http://newtextiles.media.mit.edu/uploads/S/Circuit.jpg

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http://newtextiles.media.mit.edu/uploads/S/Smaller2.jpg

February 17, 2010, at 12:51 PM by 18.80.0.92 -
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February 17, 2010, at 12:50 PM by 18.80.0.92 -
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February 17, 2010, at 12:50 PM by 18.80.0.92 -
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Role of Conductive Fabrics

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Role of Conductive Fabrics

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Circuit:

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Circuit

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Construction The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistence of 300 k ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

Opportunities for Improvement In

to:

Construction The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistance of 300 k ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

Opportunities for Improvement The movement of the lid was neglected in the design so the exposed LED mounts may short circuit with the conductive parts of the lid when moved. This could be fixed with a simple nonconductive covering over the mounts.

February 17, 2010, at 12:48 PM by 18.80.0.92 -
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Change Purse Summary

to:

Change Purse Summary

This change purse helpfully illuminates the inside of a purse if it senses the user stretch the rim of the purse as they try to find change in frustratingly dark situations.

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Role of Conductive Fabrics

Circuit

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Role of Conductive Fabrics In this project we take advantage of textiles as optimum engineering materials that provide integrated functionality, parallel construction leading to robustness, and user friendly softness.

Circuit:

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The body of the purse is regular yarn crocheted in the round followed by a rim of a crocheted strip of stretch conductive yarn. The two are bound together with a crochet stitch. The rim has a resistence of 300 k ohms unstretched and 50 ohms stretched. In this way it acts as a stretch sensor. The lid is sewn from conducting and non conducting fabrics with a neoprene battery holder embedded.

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In

to:

In

February 17, 2010, at 12:40 PM by 18.80.0.92 -
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Role of Conductiive Fabrics

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_______________________________________________________________________________________________ Role of Conductive Fabrics

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Opportunities for Improvement

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Opportunities for Improvement In

February 17, 2010, at 12:39 PM by 18.80.0.92 -
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Change Purse Summary

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Change Purse Summary

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Features

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Operating Instructions

  1. Snap purse flab to back of purse
  2. Stretch rim of purse
  3. Use light to find exact change

Features

February 17, 2010, at 12:35 PM by 18.80.0.92 -
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  • The sensor translates the user's intent into a helpful LED light
  • The snap switch leads to environmentally friendly battery power conservation
  • With exception of LED and battery, entirely soft construction
  • Use of crocheting, duplicate wiring, conductive fabrics lead to continued operation even under wear
  • Battery may be replaced
February 17, 2010, at 12:30 PM by 18.80.0.92 -
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http://newtextiles.media.mit.edu/uploads/S/Summary1.jpg

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http://newtextiles.media.mit.edu/uploads/S/Circuit.jpg

February 17, 2010, at 10:17 AM by 18.80.0.92 -
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Change Purse Summary

Features

Role of Conductiive Fabrics

Circuit

Construction

Opportunities for Improvement