Author Topic: Need a rundown for a quick (but good) pen design  (Read 4804 times)

Offline Hoaxjak

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on: February 06, 2009, 01:27:52 AM
I'm hoping to emulate some of the 20-30$ pens on penteractive and such (using some fancy ergonomic whiteboard pen as the case)

however, what exactly am i going to need? The sticky gives some good information but doesn't really give a concise parts list

here's what i THINK i need
-case
-LED (the vishay whatchamahoozit)
-small gauge wire, red and black (is 10 small enough?)
-1.2v AAA battery (do you use one or two in series? And should i just use a rechargeable for convenience?)
-12 ohm resistor

I'd like to think I'm a somewhat trained electrician. Know my way around a circuit diagram and know how to troubleshoot general electronics problems (volt meter ahoy).

Hopefully someone responds before Saturday, that's when I make my shopping excursion



Offline benpaddlejones

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Reply #1 on: February 06, 2009, 01:55:36 AM
Hoaxjak

http://www.boonjin.com/smoothboard

look at the IR-Pen section will explain all.

benpaddlejones :)


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Offline Hoaxjak

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Reply #2 on: February 06, 2009, 11:01:31 AM
yeah, about that..

what would the setup be if you wanted to have a 1.5v rechargeable battery instead of a disposable? I saw the other video that used a rechargeable battery for the pen, but, it wasn't really clear on what the mechanics are. Specifically, he didn't give a specific diagram for where the battery is in the series, and how the "3.5mm jack" factors in, and another thing, what kind of charger do you use with said 3.5mm jack, and where might you get a 3.5mm?



Offline Hoaxjak

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Reply #3 on: February 06, 2009, 12:51:55 PM
also, is sandpapering the LED really a good idea. Because in the video he suggests doing this in order to expand the LED's active projection area, making it more visible at an angle.

oh and he also uses a 1.5v N type battery, but for the VISHAY 6400, wouldn't a 1.2v rechargeable AAA be better?
« Last Edit: February 06, 2009, 02:27:53 PM by Hoaxjak »



Offline benpaddlejones

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Reply #4 on: February 06, 2009, 08:29:03 PM
Hoaxjak
Infact a AAA lithium is the best battery, exactly on power of the Vishay TSAL6400 and provides the most stable voltage at about 1.4v falling at a long exponetial rate. An alkaline battery starts high and drops at a linear rate and a copper battery starts lower an drops at a slow linear rate unless under high demand then will drop at a very high linear rate. A NiMh starts low and falls at a slightly higher exponential rate but that depends on the condition of the battery.

The reason I use a AAA NiMh is becuase it can be soldered inside the pen eliminating the need for a space consuming battery case. The voltage is not noticeable. The reason why many use the 'N' size, is it & its case can fit inside most pen bodies.

Yes lightly brushing the IR-Led with very fine sandpaper will improve the IR-dispersion. This is still be explored to find the optimum rate of sanding.

The schematic at the wiki explains how it all links together. You can purchase 3.5mm jacks & plugs from any electronics store or www.farnell.com.

benpaddlejones :)



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