~~ODT~~
= WiimoteIRPen

[[http://www.johnnylee.net|Johnny Lee]] [[http://www.ted.com/index.php/talks/view/id/245|showed a way]] to adopt [[http://www.ted.com/index.php/talks/view/id/65|Jeff Han's multitouch display]] idea for a cost of less than 50 $.

== Hardware
* a [[http://en.wikipedia.org/wiki/Wiimote|Wii Remote (Wiimote)]]
* a pen casing big enough to hold a battery, e.g. a [[http://www.franken-gmbh.de/_modules/article_popup.php?id_article=113&cur_id_lang=1|Franken Z 1908 03]]
 {{ http://www.franken-gmbh.de/pic_dyn/products/147_mw398_mh108.jpg }}
 or maybe this [[http://www3.westfalia.de/shops/technica/taschenlampen/led_leuchten/batteriebetrieb/14935-led_stiftleuchte.htm|LED pen lamp]]
* a battery that fits into the pen casing, e.g. [[http://www.conrad.de/goto.php?artikel=650554|this one]]
* a small push button, e.g. [[http://www.conrad.de/goto.php?artikel=700460|T 602]]
* an [[http://www.conrad.de/goto.php?artikel=153641|IR emitter]]

== Software

http://www.uweschmidt.org/comment/303

=== Deprecated

As I run my private computer on [[http://www.gentoo.org|Gentoo Linux]], I followed the instructions at http://gentoo-wiki.com/HOWTO_Configure_a_Wiimote_as_an_Electronic_Whiteboard

Windows users may use the software from http://www.cs.cmu.edu/~johnny/projects/wii/

== Experience

The software worked fine, but sadly I didn't succeed getting the reflection from neither my [[http://www.heise.de/preisvergleich/a152250.html|LCD monitor (Iiyama ProLite H481S-B)]] nor a white wall bright enough to be seen by the wiimote.

===Measures

Circuit: [[http://www.conrad.de/goto.php?artikel=650010|battery]], [[http://www.conrad.de/goto.php?artikel=617946|battery holder]] plus diode.

Trivial circuit: battery and diode:

|^Diode                                                   ^ Battery Voltage  ^ Current  ^ Result                |
| [[http://www.conrad.de/goto.php?artikel=153641|153641]] | 1.35 V           | 54.8 mA  | unreliable reflection |
| [[http://www.conrad.de/goto.php?artikel=153818|153818]] | 1.4 V  | 28.4 mA | no reflection |
| [[http://www.conrad.de/goto.php?artikel=154447|154447]] | 1.35 V | 57.7 mA | no reflection |
| [[http://www.conrad.de/goto.php?artikel=171140|171140]] | 1.34 V | 19. mA  | no reflection |
| [[http://www.conrad.de/goto.php?artikel=182699|182699]] | 1.36 V | 31.2 mA | no / sporadic reflection |
| [[http://www.conrad.de/goto.php?artikel=154447|154447]] + 15 Ω | 1.44 V | 14.8 mA | no / sporadic reflection |
| [[http://www.conrad.de/goto.php?artikel=153858|153858]] | - | - | untested |

The results are similar for a battery soldered into the circuit - so I think this didn't damage the battery.

===More candidates

|^ Diode ^ Voltage ^ Current ^ Angle ^ Brightness |
| [[http://www.conrad.de/goto.php?artikel=154434|154434]] | 1.2 V | 50 mA | 30 | 30 ? mW/sr |
| [[http://www.conrad.de/goto.php?artikel=154447|154447]] | 1.2 V | 50 mA | 30 | 30 mW/sr |
| [[http://www.conrad.de/goto.php?artikel=154460|154460]] | 1.3 V | 50 mA | 30 | 30 mW/sr |
| [[http://www.conrad.de/goto.php?artikel=175322|175322]] | 1.5 V | 50 mA | 20 | 120 mW/sr |
| [[http://www.conrad.de/goto.php?artikel=185809|185809]] | 1.5 V | 100 mA | 17 | 75 mW/sr |

More: [[http://www.pdf.conrad.de/actions/twoJpg.php?pg=1446&cat=7S|Conrad catalogue]]
[[http://www.pdf.conrad.de/pdf/7S/lo/7S_1446.pdf|Conrad catalogue P. 1446]]

== A more slim pen
 * Pushbutton [[http://www.conrad.de/goto.php?artikel=700460|T 602]]
 * IR LED [[http://www.conrad.de/goto.php?artikel=175322|175322 (1.5V, 50mA, 120 mW/sr)]]

The opto-electronics is built right into the tip of the pen (took me 5h). Next comes the power supply.

{{ir-pen_slim_scribble.png}}
{{tag>Wiimote IRPen}}