Jennifer Wang Class Work

Class 1: January 20 | Conductive Thread LED Circuit

 

Kickboxing-inspired hand wrap—activates LED when completely wrapped around hand and the two pieces of grey conductive fabric touch to form a complete circuit.

Made with nylon strap, velcro, conductive fabric, conductive thread, LED, and battery cell and battery holder.

 

Class 2: January 27 | Soft Switch

^ LED programmed to blink.

^Turning the LED on and off using a plastic push button switch.

Also tested this circuit using the hand-wrap made from Class 1 as a soft switch.

 

Class 4: February 10 | Flex Circuit

Flex circuit that dims or brightens the LED.

Flex sensor as “force sensor” ^

Flex sensor when bent various degrees ^

 

Resistor calculations:

Max resistance of sensor = 12k ohms

12000/2 = 6000

Round up to closest resistor available which is a 6.8k ohm resistor.

Max and min of sensor plugged into map( ) function of Arduino sketch:

Max = 1050

Min = 300

Arduino sketch:

 

Class 5: February 17 | Prototype 1 Progress

Testing knit stretch sensors

Possible knitted glove design ^

Flex sensor on glove

Prototype for flex sensor that better accommodates knuckle area

Questions our prototype addresses

  1. Can we use a flex sensor on top of the pointer finger to indicate a “Yes” movement?
  2. Can we use a flex sensor on the bottom of the wrist to indicate a “No” movement?

New skill I learned while creating prototype 1:

Knitting with conductive yarn—what “tightness” of the knit is most ideal: which is basically a tighter/more closed-in knit rather than a very loose/open knit.

 

March 2 | Prototype 1 Testing at Ability Now

Where did our prototype break?

Our sensors worked, but we learned that our client does not like the feeling of fabric tightly pressing against the back of the hand as it causes pain, and it is also difficult to put on the glove.

2 answers from our prototype test and the corresponding design changes that need to be made:

  1. Instead of a glove which is hard to put on, next we are trying a combination of a headband and a wristband with velcro so it can be wrapped around and not be “stretched” around
  2. New sensors to accommodate a headband and wristband design: Possibly a stroke sensor for the wrist and a squishy button for the headband that can be pushed if the ear is touched

 

Class 7 & 8: March 3rd & 10th | Prototype 2 Progress

Wristband Prototype 1

Wristband Prototype 2 (With conductive fabric switch + fleece)

Making the striped conductive fabric ^

Creating the circuit ^

Attaching the soft switch + circuit to the wristband ^

Questions our prototype addresses

  1. Will a wrap-around style wristband allow for ease and more comfort when putting the piece on?
  2. Will the soft switch be too stiff to activate easily/too sensitive to prevent unintended activation/or just right?

New skill I learned while creating prototype 2:

How to DIY my own striped conductive fabric using hot melt adhesive and how to turn that into a soft switch.

 

March 16 | Prototype 2 Testing at Ability Now

Where did our prototype break?

We learned that the wrist sensor (the zebra stripe “flick” sensor) is a bit on the small side. Fortunately, our client really liked the squishy button sensors and we received feedback that those are easy to use, as well as the fact that the new fleece fabric does not cause any discomfort now.

2 answers from our prototype test and the corresponding design changes that need to be made:

  1. Enlarging the size of the zebra sensor and orienting it for left—right movement, rather than up—down movement.
  2. The squishy buttons work well, now we just need to make sure we get the correct placement on the final prototype. In addition, because we want to have 2 buttons, we will make one of the buttons have a different texture so the client can easily differentiate from them despite not being able to see each button because of the placement on the side of the head.

 

Class 9: March 17 | Prototype 3 Progress

Larger zebra stripe sensor, also now with stuffing inside middle loop to make it more “substantial” and easier to flick^

Closeup of squishy buttons with different textures ^

Velcro added to headband for adjustable placement when testing prototype on client ^

Questions our prototype addresses

  1. What is the optimal placement for the two buttons on the side of the head?
  2. What is the optimal circumference measurement around the head and around the wrist, with our new double layered fleece material?

New skill I learned while creating prototype 3:

How to create squishy buttons (that work like an on/off switch) using just conductive fabric and foam!

 

Prototype 3 Testing at Ability Now

 

Where did our prototype break?

(We went this time to determine the most optimal placement for the buttons on the side of the headband. See above post for the velcro system we set up so it would be easy to move around the buttons during the testing.)

Changes to be made for the final prototype

  1. Adjust the button placement as needed.
  2. Otherwise, everything else worked 🙂

 

At this time we also locked in the final prototype design and layout of components:

Circuit:

Materials list:

  • Black fleece fabric
  • Conductive knit fabric
  • Black mesh fabric
  • Foam
  • Velcro
  • Iron on adhesive
  • Audio FX board
  • Battery
  • Speaker