Записи с темой: tutorial (список заголовков)

Wearables Workshop Development and Conduction: my seminar at the LMU

During the last week of February I was teaching a seminar on wearable technology and education for the third time in a row. This course was a collaboration with Dr. Karin Guminski and Michael Dietrich from SPIELkultur, and Simone Damm was assisting us this year.
All pictures on this page are courtesy of the seminar participants or Anna Blumenkranz

We had an intense week, during which the students had to come up with a workshop idea and produce it: acquire all necessary materials and tools, make an instruction, and after assessing the workload for their target group pre-produce different parts and steps. The next week after the course we went into a school and conducted these workshops with the 5th and 7th grade kids during two afternoons.

One of the challenges this year was having the double amount of students on the course: 24 instead of 12... And another trouble was that I had a flu and completely lost my voice on the second day. Which is not the most convenient thing for a teacher. On the last day of the course, my co-teachers had to act as my voice and read or say out loud what I was meaning to tell everyone in the classroom. Human amplifiers :)

On the technical side, this year I've introduces the students to ATTiny85, as I wanted them work with sound. ATTinys are little micro-controllers, which only cost 1,50€ in the eHaJo-shop! A great price for a computer. Similar to an arduino, you can address different pins through code, and attach sensors and actuators to them. Here is what we were doing during the first one and a half days:

STEP1: I've used Arduino Uno to programme the ATTinys (thanks to Hannah Perner-Wilson for a fantastic tutorial). I've used the following code for the Super Mario tune, and this one for the Star Wars tune, and adjusted both slightly.

STEP2: I've made the following swatch to demonstrate the circuit. I intentionally left it as basic as possible, as I didn't want to influence the students' future designs in any way. The circuit uses a 3V battery as a power source, the ATTiny chip soldered onto a piece of stripboard to control everything, a piezo for the buzzing audio output and a standard LED for the light, and two popper switches to open the circuit.

I was very pleased with some of the students' ideas and designs, which extended my circuit and incorporated it in various designs, making them attractive for 10-12-year-olds! There were sock puppets, Minion smartphone pockets with stretch sensors, school book covers with owls, bags with printed tape recorders to switch on and Super Mario mushrooms

@темы: LMU, Teaching, Workshop, etextiles, physical computing, soft circuit, tutorial, wearables


Solar Hood

Initially I wanted to build a flexible solar phone charger, to roll it out and attach to the top of your backpack and charge your phone on the go with green energy. But then I considered the costs and the challenges, and went for a playful option.

So here is a brief tutorial on how to make your own solar hood, or whatever you want to attach it to.

Collect your Materials.
You will need:

- solar motor
- solar cell 
- 3V coin battery
- battery holder
- conductive fabric
- conductive thread
- velcro
- fusible interfacing (in German: Vliseline. A double-sided sticky material for ironing two pieces of fabrics onto each other)
- something light like feather or small leaves
- felt

STEP 1: Plan your circuit. Position your motor, battery, solar cell and velcro switches, and draw the connection, so that you're able to switch the energy source.
STEP 2: Make your motor wearable.
Depending on your motor shorten the wires, remove the isolation and form a loop. Solder this wire loop to a metall popper. Repeat for the second piece of wire.

I used a different motor for my circuit, with wires thick and stable enough to be sewn directly into the fabrics. So I used plastic poppers as an addition, as on the very first picture. Play around with yours!
 Make a felt holder for your motor. If your felt is thin or your motor rather tall, put two layers of felt together. Cut out a form which covers your motor and add two symmetrical "legs" on the bottom.
Secure the two layers with pins and cut it out. Then sew the two layers together.

Wrap the felt holder around your motor and secure it with a pin. Take the motor out and sew the holder together. Take conductive thread and sew metal poppers onto the "legs" of your holder.

Attach a feather or anything light with hot glue to the very top of your motor. This way you'll see the movement of your motor immediately. Be careful not to put too much glue, otherwise it will be too heavy for your motor, and it won't rotate.

STEP 3: Make your solar cell wearable. 
Strip the isolation off a piece of wire and form a loop with pliers. Then cut off this piece. Repeat for another three pieces. Then solder two loops onto the plus and minus contacts in the corners. And glue the other two loops with a hot glue gun onto the opposite corners.

STEP 4: Assemble your circuit. 
Now place all your components on your piece of felt according to your circuit plan, and mark their position with a pen.

Draw your circuit connections on a piece of your fusible interfacing, then put it on a piece of conductive fabric. The paper side of it should be facing you.

Note! The lines on the fusible interfacing paper will be mirrored later, so consider this for your circuit.

 Then iron the fabric.


 Cut out your lines.
 Peel the paper off and put your conductive connectors on the felt. Iron them onto it.

 Establish connections to your components by sewing them onto conductive fabric with conductive thread. Make sure your connections are tight enough. Otherwise there will be an unstable contact.

 STEP 5: Make a velcro-switch.
 Sew the bottom-side of velcro onto the end of your battery connection with conductive thread. Make sure to establish a good connection. Do the same for the solar cell connection. Then sew the third bottom part with normal thread, to make an off-mode for your switch.

Sew the other two metal poppers into your circuit for your motor holder. Thread through one of the poppers with conductive thread and stitch through the upper part of velcro, so that it's moveable and long enough to touch each of the three bottom velcro parts.

Now attach your motor holder.

Here are two examples made during the workshop:

This workshop is inspired by Kobakant's Solar T-Shirt, though in the end I chose to simplify the circuit and make it possible to switch between different power options. Also, I'd like to thank Hannes from eHaJo for helping me with electric troubleshooting!

Creative Commons License
Solar Hood by Anna Blumenkranz is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Based on a work at http://www.kobakant.at/DIY/?p=2763.

@темы: wearables, tutorial, solar, soft circuit, motor, etextiles, Workshop, Teaching, Geekery

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