Exoplanet reference: http://planetquest.jpl.nasa.gov/
Link for images: http://www.flickr.com/photos/contrechoc/sets/72157634279086536/
Interactivity: ATTINY13a, LDR, resistor
Materials: tent fabric, (side 1: camouflage, side 2 silver green), organza
Techniques: Soldering, programming, sewing, embroidering
Dimensions: folded 13×16 x 2cm, extended 16 x 20 x 7
You take this Exobag along on your journey to an exoplanet. After travelling for a few decades at lightspeed you enjoy a picknick at a lake of liquid ammonia. When a dark cloud of sulphuric acid drifts in front of the two suns there will be a small Exobag LED blinking to comfort you. You go home quickly to find all civilization on earth as you knew it destroyed in a catastrophy far in the future. Now you really need the Exobag to give you a feeling of home. After the battery runs out you recycle the electronics and the materials.
The challenge was to have interactivity at minimum material cost. The smd Attiny13a was found at 60 eurocents, total costs 2 euro’s. Energy supply: 3V coin cell battery provided inside the bag in its own pouch, right side.
The battery is the switch, inside the bag you must insert the battery in the left battery pouch. (The textile battery holder is not always connecting well, either push a bit, or insert conductive material at one or both sides of the battery.)
The effect starts with 5 fast blinks, only if ambient light level is low, it starts blinking randomly, a bit like these candlelights.
Recycling: the electronic components can be removed without a problem. The only e-textile thing left is a tiny amount of conductive thread in the battery pouch.
programming the attiny13a and the inside battery pouches (shown with bevel…)
(After I have made 24 exobags, i know how i should have made it :-), (improving sewing patterns and better electronics) which may be leading to a version 0.2 )
Testing:(all 24….only 5 are still resisting a bit…. see the sketch movie in the dark for the effect)