hello.
i know that there is a thread one can use with the arduino which heats up so that it can be used in projects like this one: electroniccrafts.org
i can't find the thread they used in this project, do you know where its possible to buy it? what exactly does "High resistivity" mean, i guess i couldn't use the ones on sparkfun (Search Results for conductive thread - SparkFun Electronics), could I?
I think you mean what WIRE do I need for...
Probably worth changing your subject line to "What wire for heating element?" (Only you can do this... just go back to first article in thread, open it for editing.)
See....
Anyone reading this thread needs to understand that the Arduino cannot drive such a wire directly. It will have to drive a transistor, or some other intermediary.
"What wire for heating element?"
No I disagree, wire is the wrong word thread is the correct word. Basically it is a fabric based conducting element that is needed not a metal based conducting element.
These can be based on polymers or carbon. In order to generate heat efficiently that have to have a higher resistance than the "wires" used to connect them to the battery. That link you posted for conducting thread has quite low resistance and while that would work if you put enough current down it, there would be as much heat generated in the wiring to the point you wanted heating as the bit you did want heating.
Sorry but I don't have a solution, however there was an instructables article recently on conductive flexible "ink" which was a mixture of carbon and "liquid tape". That might serve as a basis for what you want.
i found what i need at an electronics store now. its a resistance wire, the one i bought hast 2.2 ohm resistance per meter.
so to make this wire heat up with an arduino, i need a transistor? i'm really an electronics / arduino beginner, so how do i know which transistor to use?
and how would i set this up? connect a transistor and the wire to a digital arduino pin?
i found what i need at an electronics store now. its a resistance wire, the one i bought hast 2.2 ohm resistance per meter.
That's lower than either of the threads that SparkFun sells! You want high resistance per unit of length, not low. For instance:
Has 82 ohms per foot (or ~269 ohms per meter - nichrome wire, like that used in a toaster, depending on the gauge - can be close to what you have in ohms per meter); I would say -don't- attempt to use what you have (you might just set the clothing on fire!), and instead get the conductive thread from SparkFun and use that, or try to find something with even higher resistance if that doesn't work out.