====== Week 5: E-Textiles and Wearables I ======

==== Assignment 1: LED Circuit ====

=== Playing with Blink ===

This is my first time using Arduino, so i started testing and playing with a basic example.

The code that appears is this:

{{:fabricademy2017:students:edgardelarubia:blink_code.jpg?nolink&500x186|blink_code.jpg}}

In order to make a modification, I included a second LED and I modified the code:

{{:fabricademy2017:students:edgardelarubia:modificacion_blink.jpg?nolink&500x315|modificacion_blink.jpg}}

And I tested it on a breadboard:

{{:fabricademy2017:students:edgardelarubia:breadboard_blink_ejemplo.jpg?nolink&500x667|breadboard_blink_ejemplo.jpg}}

It´s a just an easy modification, when Led A is on, Led B is off and viceversa.

=== ATtiny Programming ===

**To get the ATtiny software:**

**1. File > preferences > Aditional boards url > add:**

**[[https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json|https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json]]**

**2. Tools > Board > Board Manager**

Then we look for ATtiny and install it.

**{{:fabricademy2017:students:edgardelarubia:busqueda_gestor_tarjetas.jpg?nolink&300x172|busqueda_gestor_tarjetas.jpg}}{{:fabricademy2017:students:edgardelarubia:busqueda_gestor_tarjetas2.jpg?nolink&300x177|busqueda_gestor_tarjetas2.jpg}}**

**3. Then in Tools > Boards have to appear the ATtiny.**

**{{:fabricademy2017:students:edgardelarubia:busqueda_placa_at.jpg?nolink&415x453|busqueda_placa_at.jpg}}**

**Now we have the software to use our arduino as a programmer for our ATtiny. To do that we have to know what are the different pins of the ATtiny, to programm it using ISP.**

**{{  :fabricademy2017:students:edgardelarubia:pins_attiny.jpg?nolink&622x183  |pins_attiny.jpg}}**

In Kobakant there is a fantastic schematic for conecting Attiny to our arduino.

{{  :fabricademy2017:students:edgardelarubia:bradboard_attiny.jpg?nolink&549x474  |bradboard_attiny.jpg}}

**Tip: We need to put a 10mF capacitor between reset and GND to avoid the reset procedure.**

__**Programming the ATtiny45 or ATtiny85:**__

   - Select “ATtiny45 (8 MHz)” from the “Tools > Board” menu
  - Select “Arduino as ISP“ from the “Tools > Programmer” men
  - Open the sketch you want to upload to the ATtiny
  - Upload sketch

I use again the blink code to test how th Attiny works. I changed pin 13 for 0:

{{:fabricademy2017:students:edgardelarubia:blink_at_code.jpg?nolink&544x261|blink_at_code.jpg}}

And using the schematic to see the conection of the led to the AT, I put it in the bread board:

{{:fabricademy2017:students:edgardelarubia:led_at_blink.jpg?nolink&400x281|led_at_blink.jpg}}{{:fabricademy2017:students:edgardelarubia:img_30102017_200756_1.jpg?nolink&500x375|img_30102017_200756_1.jpg}}

All this process was possible with the help of Kobakant and the tutorial to do it, and the tips of High Low Tech. Here I write the sources:

  * **[[http://www.kobakant.at/DIY/?p=3742|http://www.kobakant.at/DIY/?p=3742]]**
  * **[[http://highlowtech.org/?p=1706|http://highlowtech.org/?p=1706]]**
===== Assignment 2: ATtiny Circuit =====

=== Making my textile sensor: ===

Actually this was a fail, because I used wrong materials to make it. My idea was to replicate the Bonded Bend Sensor that Kobakant shows ih their web.

Materials:

  * cotton fabric
  * Eeontex Stretch Fabric
  * Silver stretch conductive fabric
  * Fabric Glue (the key of the fail!)

{{:fabricademy2017:students:edgardelarubia:img_30102017_204800.jpg?nolink&350x467|img_30102017_204800.jpg}}{{  :fabricademy2017:students:edgardelarubia:img_30102017_205125.jpg?nolink&350x467|img_30102017_205125.jpg}}

{{  :fabricademy2017:students:edgardelarubia:img_30102017_205448.jpg?nolink&400x533  |img_30102017_205448.jpg}}

**I don´t know if the fabrics glue just "melts" the fibers to paste them, or it´s simply that it acts as insulation, but when I measured with the multimeter, the sensor had a lot of resistance, and when i strecthed it that only decreases a little bit. I thought the glue could be a good alternative to the heat bond adhesive that appears in Kobakant, but obviously that was a very bad solution.**

**Making my textile sensor (Part II)**

**In this case I made a simple pressure sensor using:**

  * **Velostat**
  * **felt**
  * **aluminium sheet**
  * **adhesive copper sheet**