New Textiles 2010

For a video of the Fractal Tree Bag in action, please see these links: YouTube or QuickTime

http://web.mit.edu/dawn/www/MAS962/softcircuit/AVRcircuit.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/circuit.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/laser2.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/circuit-assembled.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/wires-assembled.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/solder-done.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/ironontrees.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/pressure2.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/pressure3.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/neoprene.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/pressure4.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/touch1.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/touch4.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/touch2.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/touch3.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/laser1.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/soldering.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/AVRtesting.jpg http://web.mit.edu/dawn/www/MAS962/softcircuit/cat.jpg

http://web.mit.edu/dawn/www/MAS962/softcircuit/bag.jpg

The code was designed to flash between all the outputs when there were no inputs, and if an input was detected, then only one LED would light up. The code was first tested on one of the pre-made circuits from the in-class demo before being loaded onto the ATtiny13 microcontroller installed on our bag circuit.

Thanks to Lisa Burton for being the hand model in the video!

Felecia, Elly, Dawn, Tiffany

However, when the pressure sensor was installed in the bottom of the bag, testing showed that the pressure sensor was too sensitive. A layer of neoprene was added with holes cut in it to decrease the sensitivity.

http://web.mit.edu/dawn/www/MAS962/neoprene.jpg http://web.mit.edu/dawn/www/MAS962/pressure4.jpg

The touch sensor is created by sewing conductive and non-conductive threads onto a fabric background. When the sensor is touched, the threads flatten out and make contact, decreasing the resistance across the sensor. The touch sensor was sewn onto the bag to cover the battery holder but the top edge wasn't attached so that the battery can be accessed.

http://web.mit.edu/dawn/www/MAS962/touch1.jpg http://web.mit.edu/dawn/www/MAS962/touch4.jpg

This design was translated into Illustrator and combined with the Tree Motif. The components were then soldered on and encased in epoxy. The soldering was challenging because the conductive fabric would melt if it got too hot. Therefore, some gaps (caused while Dawn was learning how not to burn the bag) had to be closed with additional wires. The finished lasercut pieces before soldering, and after soldering and epoxy are shown below:

http://web.mit.edu/dawn/www/MAS962/laser2.jpg http://web.mit.edu/dawn/www/MAS962/circuit-assembled.jpg

http://web.mit.edu/dawn/www/MAS962/laser1.jpg http://web.mit.edu/dawn/www/MAS962/soldering.jpg http://web.mit.edu/dawn/www/MAS962/AVRtesting.jpg http://web.mit.edu/dawn/www/MAS962/cat.jpg

For a video of the Fractal Tree Bag in action, please see these links: YouTube or QuickTime

Our concept was to make a canvas bag with a fractal tree design that integrates sensor inputs and LED outputs. The two sensors are (1) a pressure sensor at the bottom of the bag and (2) a touch sensor integrated into the "grass" at the bottom of the tree motif. The outputs are three LEDs.

For a video of the Fractal Tree Bag in action, please see these links: YouTube or

Our concept was to make a canvas bag with a fractal tree design that integrates sensor inputs and LED outputs. The two sensors are (1) a pressure sensor at the bottom of the bag and (2) a touch sensor integrated into the "grass" at the bottom of the tree motif. The outputs are three LEDs, one of each green, yellow, and red. For a video of the Fractal Tree Bag in action, please see these links: YouTube or

http://web.mit.edu/dawn/www/MAS962/bag.jpg

http://web.mit.edu/dawn/www/MAS962/touch0.jpg http://web.mit.edu/dawn/www/MAS962/touch1.jpg

http://web.mit.edu/dawn/www/MAS962/touch1.jpg http://web.mit.edu/dawn/www/MAS962/touch0.jpg

The tree motif was chosen because we wanted to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The fractal tree was coded in Rhinoscript. The tree was laser cut from 3 separate iron on fabric layers. The first was the conductive fabric, the remaining two were satins. The Tree Motif file and a photo of the tree in-progress are below:

The touch sensor is created by sewing conductive and non-conductive threads onto a fabric background. When the sensor is touched, the threads flatten out and make contact, decreasing the resistance across the sensor.

http://web.mit.edu/dawn/www/MAS962/touch1.jpg http://web.mit.edu/dawn/www/MAS962/touch2.jpg http://web.mit.edu/dawn/www/MAS962/touch3.jpg

However, additional testing showed that the pressure sensor was too sensitive, so a layer of neoprene was added with holes cut in it.

http://web.mit.edu/dawn/www/MAS962/neoprene.jpg

http://web.mit.edu/dawn/www/MAS962/wires-assembled.jpg http://web.mit.edu/dawn/www/MAS962/solder-done.jpg

http://web.mit.edu/dawn/www/MAS962/ironontrees.jpg

The components were then soldered on and encased in epoxy. The soldering was challenging because the conductive fabric would melt if it got too hot. Therefore, some gaps (caused while Dawn was learning how not to burn the bag) had to be closed with additional wires.

http://web.mit.edu/dawn/www/MAS962/soldering.jpg http://web.mit.edu/dawn/www/MAS962/circuit-assembled.jpg http://web.mit.edu/dawn/www/MAS962/wires-assembled.jpg

The tree motif was chosen because we wanted to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The fractal tree was coded in Rhinoscript. The tree was laser cut from 3 separate iron on fabric layers. The first was the conductive fabric, the remaining two were satin and cotton. The Tree Motif file and photos of the tree in-progress are below:

We used a tiny iron to attach the two fabric layers over the conductive layer to avoid melting the epoxy covered surface mounted leds and resistors.

 We used a tiny iron to attach the two fabric layers over the conductive layer to avoid melting the epoxy covered surface mounted leds and resistors.

• Originally we wanted to do the fractal tree (red layer) in leather, we test cut a perfect square of leather at 100power/15speed in the lasercutter. However, our pattern was so delicate that the pieces either burned or did not cut. I think with more time we would find the correct setting to cut these lacy leather kinds of pieces in the lasercutter. Instead we used two silky fabrics to make overlapping layers for the trees these were cut at 50power/50speed

Other lessons learned include using a tiny iron to attach the two fabric layers over the conductive layer to avoid melting the epoxy covered surface mounted leds and resistors.

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The fractal tree was coded in Rhinoscript. The tree was laser cut from 3 separate iron on fabric layers. The first was the conductive fabric, the remaining two were regular fabric a soft brown leather which was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The tree was laser cut from 3 separate iron on fabric layers. The first was the conductive fabric, the remaining two were regular fabric a soft brown leather which was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

Lessons Learned_About Fabric and Size of Pattern

Other lessons learned include using a small iron to attach the two fabric layers over the conductive layer with its surface mounted leds and resistors.

Originally we wanted to do the fractal tree (red layer) in leather, we test cut a perfect square of leather at 100power/15speed in the lasercutter. However, our pattern was so delicate that the pieces either burned or did not cut. I think with more time we would find the correct setting to cut these lacy leather kinds of pieces in the lasercutter. Instead we used two silky fabrics to make overlapping layers for the trees these were cut at 50power/50speed.

Lessons Learned

Originally we wanted to do this in leather, we test cut a perfect square of leather at 100power/15speed in the lasercutter. However, our pattern was so delicate that the pieces either burned or did not cut. I think with more time we would find the correct setting to cut these lacy leather kinds of pieces in the lasercutter.

This is an image of the conductive fabric circut in blue, and the fractal tree in red. Attach:conductivetreeand Δ red.jpg

• In attaching our two switch sensors, we originally intended for the switch to close a circuit to ground, and pull the microcontroller pin low. However, we discovered that the open circuit was also read as "low"...most of the time. The floating end of an open circuit was variable, generally reading low but occasionally collecting a voltage value high enough for the microcontroller to read as "high," despite the pin not being pulled to power. We solved this problem by connecting a 10K resistor between the input pin and ground, then attaching one side of the sensor to an input and one side to power. With this arrangement, the pin is pulled to ground when the switch is open. When the switch is closed, the direct connection to power has less resistance than the connection to ground, and so the pin is pulled high.

• Soldering surface-mount components onto conductive fabric is hard because if the fabric overheats, it burns away. The best technique that we found was to tin the pieces heavily, use lots of flux, and be quick and careful with the soldering iron.

Felecia: design of the conductive paths, design of the tree, lasercutting

Lessons Learned

• We cut the circuit onto the wrong side of the conductive fabric so the circuit was cut but the paper was not. This was a problem when trying to peal off the paper only in select locations so it could be ironed onto the bag. We solved this problem by taping over the other side of the circuit, peeling off the parts that we didn't want to be ironed, and then ironing over the tape. It worked, but definitely wasn't the ideal case.

PICTURE of whole bag

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The tree was laser cut from a soft brown leather which was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

The pressure sensor is a sandwich of conductive fabrics separated by foam and surrounded by felt. This sensor was placed at the bottom of the bag so that it would respond to anything placed in the bag. Photos of the construction and finished sensor are below:

Dawn: initial circuit design, pressure sensor, documentation

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http://web.mit.edu/dawn/www/MAS962/pressure2.jpg http://web.mit.edu/dawn/www/MAS962/pressure3.jpg

http://web.mit.edu/dawn/www/MAS962/laser1.jpg http://web.mit.edu/dawn/www/MAS962/laser2.jpg

http://web.mit.edu/dawn/www/MAS962/pressure1.jpg http://web.mit.edu/dawn/www/MAS962/pressure2.jpg http://web.mit.edu/dawn/www/MAS962/pressure3.jpg

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The fractal idea came from this website which talks about polygon fractals. The tree was laser cut from a soft brown leather. This fabric was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The fractal idea came from here website which talks about polygon fractals. The tree was laser cut from a soft brown leather. This fabric was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

Elly: AVR Programming, lasercutting

http://web.mit.edu/dawn/www/MAS962/AVRcircuit.jpg http://web.mit.edu/dawn/www/MAS962/circuit.jpg

http://web.mit.edu/dawn/www/MAS962/circuit.jpg

http://web.mit.edu/dawn/www/MAS962/circuit.tiff

The pressure sensor is a sandwich of conductive fabrics separated by foam and surrounded by felt. Photos of the construction and finished sensor are below:

PICTURE

PICTURE

There are two sensors on the Fractal Tree Bag, the pressure sensor and the touch sensor.

Pressure Sensor

Touch Sensor

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The tree was laser cut from a soft brown leather. This fabric was chosen for its textural qualities. The Tree Motif file and photos of the tree in-progress are below:

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The tree was laser cut from a soft brown leather. This fabric was chosen for its textural qualities. Photos of the tree in-progress are below:

TREE PICTURE

TREE PICTURE

Attach:bag.txt

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design. The tree was laser cut from a soft brown leather. This fabric was chosen for its textural qualities to

Tiffany: stroke sensor, artistic elements

Current Code: Attach:bag.c Δ

The tree motif was chosen to take advantage of a desire to integrate fractal patterns into the design.

Elly: AVR Programming

Felecia: design of the conductive paths, design of the tree

Dawn: initial circuit design, pressure sensor

Tiffany: stroke sensor, artistic elements

An initial circuit sketch and circuit diagram are shown below:

OTHER LINK

This design was translated into Illustrator and combined with the Tree Motif. The final layout and the finished lasercut pieces are shown below:

PICTURE

PICTURE

Tree Motif Design

The Sensors

The AVR Programming

Tiffany:

Circuit Design

http://web.mit.edu/dawn/www/MAS962/AVRcircuit.jpg

Contributions

Elly:

Felecia:

Dawn:

Tiffany:

Hello World Fabric PCB Assignment: Fractal Tree Bag

Our concept was to make a canvas bag with a fractal tree design that integrates sensor inputs and LED outputs. The two sensors are (1) a pressure sensor at the bottom of the bag and (2) a touch sensor integrated into the "grass" at the bottom of the tree motif. The outputs are three LEDs, one of each green, yellow, and red. For a video of the Fractal Tree Bag in action, please see these links:

LINK LINK

An beginning circuit diagram by Dawn is sketched here:

Our initial concept is to make a canvas bag that integrates sensing (pressure & touch) and LED outputs.

An initial circuit diagram by Dawn is sketched here:

http://web.mit.edu/dawn/www/MAS962/AVRcircuit.jpg

Elly, Felecia, Dawn, Tiffany

emails: ejessop, fad, dawn, tiffy

emails: ejessop, fag, dawn

emails: ejessop, fag, dawn

Elly, Felecia, Dawn

Elly, Felicia, Dawn

Hello World Fabric PCB Assignment

Due March 3, 2010

Elly, Felicia, Dawn