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Is it possible to actuate muscle wire through Raspberry Pi ? This product expects ~200mA to revert to its original shape. If so, how would the circuit look like ? What resistors should I hookup ?

https://www.sparkfun.com/products/12095

closed as off-topic by Ghanima, lenik, Milliways, Morgan Courbet, Bex Oct 22 '14 at 14:01

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be specific to the Raspberry Pi within the scope defined in the help center." – Ghanima, lenik, Milliways, Morgan Courbet, Bex
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Hello and welcome. I'd recommend to put that question to electronics.stackexchange.com to get better answers how to drive that wire. This is a little bit beyond hooking up some resistors (even if just a little that is). – Ghanima Oct 16 '14 at 19:18
  • Yea, its great that the datasheet has a typical application circuit.... noot. sigh – Piotr Kula Oct 16 '14 at 20:59
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All it requires is a switch of some kind to a voltage. It can be a Mosfet switch, triac, optocoupler (like in diagram) or a relay. Trigger the switch with a PIN.

Remember though, this stuff heats up (not sure how fast)! It has a ohms per meter specification too and a cool down period, depending on thickness. Its best to put a resistor on the negative side too to avoid short circuit by using Ohms law to calcalat e safe voltage drop. 5v to 2v for example.

enter image description here

https://www.youtube.com/watch?v=JKBM9my5eOA

  • thanks man, it looks simple enough. Is it possible to directly hook this wire to RPi without the optocoupler or is it too risky ? – MD Luffy Oct 17 '14 at 21:33
  • No, I dont think the GPIo pin can handle that much current. You must always assume that conencitng something to PIN is not safe, that is why transistors are used for. You can find transistors anywher on any old PCB, search for the number on the transistor and you will get a docuement. for switching simple voltages almost anything can be used. – Piotr Kula Oct 17 '14 at 21:35

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