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47 lines
926 B
Markdown
47 lines
926 B
Markdown
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---
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title: "Heated Trackball"
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date: 2014-12-22T14:34:34+02:00
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draft: false
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---
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## Parts needed
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* Heating wire (0,2mm 43,95 Ohm/m Kanthal D)
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* some regular wire
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* glue
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* soldering equipment
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Since the USB port should ghive us 500mAh and the trackball shouldn't
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consume more than 150mAh, the wire might consume 350mAh. Knowing the
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voltage of 5V and the desired power consumption, it is easy to
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calculate the needed resistor:
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![image][1]
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The heating wire has a resistance of 43,95 Ohm per meter, the wire
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needs to be 33cm long in order to consume 350mAh:
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Icalculation of the wire length /pics/length.png
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## Assembly
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Glueing the wire to the inner side of the housing:
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![image][2]
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After reassembling the mouse buttons:
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![image][3]
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The finished trackball:
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![image][4]
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![image][5]
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[1]: /img/resistance.png
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[2]: /img/trackball1.jpg
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[3]: /img/trackball3.jpg
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[4]: /img/trackball2.jpg
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[5]: /img/trackball4.jpg
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