Bend / flex sensor: ($9.95)
Three different resistance range flex sensor, from 1k- 20k, 20k – 50k, and 50k- 200k. http://www.etsy.com/view_listing.php?listing_id=21477365. http://www.kobakant.at/DIY/?p=1781 provide good description about how to DIY and sold two out.
Fabric/stretch sensor: ($5)
it has stretch sensor, but not with fabric.
For the above two bend/stretch sensor, a lot of website recommend DIY for your own purpose and shape.
http://www.robotstoreuk.com/SENSORS%2BVISION/MerlinStretchSensor/MerStretchSensor.htm tells how to evaluate a stretch sensor.
Electroluminescent “wire” (EL-wire) ($1-1.4/feet)
tons of choices for different color and shape
Alcohol sensor ($4.95)
thanks for sparkfun..I am wondering where to use that? For house safety?
again, wide range and very different specs. Got to be careful when ordering.
Linear actuator ($7)
solenoid can be used as linear actuator.
Fiber optic cable ($2.5- 5.5)
depends on the length.
Tiny potentiometer ($0.08)
this website sometimes busy and can not be loaded. But the potentiometer is really tinny.
Conductive fabric ($1.95/ lin ft.)
http://www.metexcorp.com/shielding_conductive_fabric.htm, you can download technical bulletin. Different material, price varies a lot!! If you want to use one for cloth, good quality is recommended.
Thermochromic paint/dye ($44.99, 25 gram)
Nitinol / shape memory alloy wire ($11.48)
Conductive paint ($9.34/21 ml)
it has different types, such as carbon, platinum..
Neodymium magnets ($ 0.79 for cup magnets) tons choices.
Copper tape / copper foil ($7.49) Copper foil tape can be applied to any surface and soldered
Tilt sensor ($1.00)
This website is tricky, need to re-input search for tilt sensor, but pricing is clear.
Peltier Junction ($14.95)
http://www.electronickits.com/kit/complete/peltier/ck501.htm. heat and cooling device. depends on power.
Total around: $118.51. LaLaLaLa. No shipping fee considered. you may argue with me since I get the lest quantity for some staffs.
Each time, when you’re flushing the toilet, a switch will beactivated. Voila, a message is posting on the Twitter instantly!