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1  Topics / E-Textiles and Craft / Re: New to Muscle Wires and Arduino on: July 01, 2012, 11:25:36 pm
Hey guys...thanks for all the help...yes, the diameter is 250 micrometers or 0.01". Was off by a factor of 10 there. Sorry about that. The resistance is 20 ohms/meter or 1/2 ohm per in. The rec current is 1 Amp and I am using about 16" of wire so internal resistance of my wire is about 21 ohms. At 5V from the Arduino, I am only passing through about 240mA so I dont think that is enought to move the wire. So I am going to try this tranistor or relay once I get some time this week. I did setup the wire outside of the Arduino and a 9V battery was plenty (it moved nicely). Which means it was approx double the juice or about 450mA or so. Funny that half wouldnt cause it to move at all? So I guess I am just looking for a nice picture of someone driving a 9V battery to turn on/off from an Arduino. I will try that video that was posted and see if I can substitute the head light for a the wire. Again, I am new to this and yes, I know it is frustrating for the experts smiley but like anything else, I have to start somewhere smiley. Thanks for being patient.
2  Topics / E-Textiles and Craft / Re: New to Muscle Wires and Arduino on: June 29, 2012, 08:27:37 pm
Thank you good sir. Any chance anybody out there has a picture of how this would work? Like I said, I am a novice at this and the purpose isnt so much the circuit as to the mechanical effects of the muscle wire. You can use a normal wire in place of the muscle wire as I know it is not easy to get. With a picture, I can figure out what to buy and then hook it up. I know I cant let the current keep going through the muscle wire or I will break its crystalline structure and it will not follow its hysterisis curve again. So I think I need something to block/switch the current as well (other than unplugging it). I was planning to use a big potentiometer to possibly attenuate the current. Thanks again.
3  Topics / E-Textiles and Craft / New to Muscle Wires and Arduino on: June 29, 2012, 03:21:42 am
I am trying to hook up some muscle wires (flexinol...0.001" in dia...1000mA is the proposed current) to an Arduino Uno. I dont think the 5V is creating enough juice even without a resistor. I may not even be wiring it up right. Does somebody have an example (not a circuit diagram...I am not an electrical engineer smiley ) like a snapshot of a breadboard? Suggestions on how I can get enough current into the muscle wire - maybe using the VIn pin connected a 9V source? Do I need a relay? Again, a picture is worth a thousand words smiley
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