Author Topic: IR Pressure Pen  (Read 4663 times)

Offline kiwi

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on: July 23, 2008, 04:11:55 AM
Have been playing around with the Wii whiteboard on the Mac and using Curio as a "notebook" - works really well.

Saw a couple of posts relating to a pressure type pen and a number of colleagues suggested it may work better.

Attached is a diagram of the pen I constructed (took about 45 minutes). Tested it by pressing against a piece of perspex plastic sheet and held the camera phone up to it - as the wii remote is at work!

 It Worked!

Hope this may be helpful to anyone exploring the use of the wii whiteboard

][/http://elearning.teacherblog.org.nz/files/2008/07/irpendiagram.jpg]
][/http://elearning.teacherblog.org.nz/files/2008/07/irpressurepen.jpg]
« Last Edit: July 23, 2008, 05:36:09 AM by kiwi »



Offline Vestibule Chaperone

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Reply #1 on: July 24, 2008, 02:03:37 PM
How does the pen itself retract? Is there two metal pieces pressing it back and forth? And if so, whats the use for the spring?



Offline kiwi

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Reply #2 on: July 24, 2008, 03:20:35 PM
As the tip is pushed the two ends of the LED touch the two bits of metal (spade connectors). One is positive and one is negative- thus completing the circuit and lighting up the lLED.
Basically it is a simple switch. The spring provides "resistance (not electrical)" so the tip returns - and switches the LED off.
« Last Edit: July 24, 2008, 04:06:19 PM by kiwi »



Offline Vestibule Chaperone

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Reply #3 on: July 24, 2008, 04:44:20 PM
I've thought about using a spring, but the only thing is, wont the metal on the spring itself complete the circuit? And how are you keeping the LED erect?



Offline kiwi

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Reply #4 on: July 24, 2008, 04:50:53 PM
I used the plastic sheafing from the wire and slipped this over one of the LED pins. The LED holder was drilled out so the LED travels down into the holder. The bent LED pins prevent the spring from "ejecting" the LED all the way out. I then used heat shrink to encase the bottom part of the holder. This is a first attempt - there are a few things I will look at improving.