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Author Topic: Glow in the Calc  (Read 11767 times)

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Offline mapar007

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Re: Glow in the Calc
« Reply #15 on: November 29, 2009, 07:01:48 am »
Heh, I was thinking of that radium calc too xD (but it's too long ago for me to have experienced)
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Offline DJ Omnimaga

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Re: Glow in the Calc
« Reply #16 on: November 29, 2009, 04:59:09 pm »
I think I actually saw this around 2002, when checking some old ticalc news, at first I was like lol wtf? XD

Also welcome back Mapar007, noticed you haven't been around in a while
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Offline mapar007

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Re: Glow in the Calc
« Reply #17 on: December 02, 2009, 12:43:30 am »
Indeed, exams going... I still won't be very active in the coming two weeks.
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Offline DJ Omnimaga

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Re: Glow in the Calc
« Reply #18 on: December 02, 2009, 01:49:03 am »
I wish you good luck in them
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Offline JoeyBelgier

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Re: Glow in the Calc
« Reply #19 on: December 02, 2009, 06:56:17 am »
me neither x.x exams suck =[
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Offline GunGodTheGreat

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Re: Glow in the Calc
« Reply #20 on: March 03, 2010, 08:29:18 pm »
hmmm the leds sound like a cool idea, once my nspire gets old i might have to try that, or maby even soon lol. The power problem, just get a couple of those advanced lithium energizer batterys. They really do last 10X longer they arnt kidding.
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Offline DJ Omnimaga

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Re: Glow in the Calc
« Reply #21 on: March 03, 2010, 09:54:19 pm »
are they pretty expensive, though? Just E2 energizers were like $12 for 4 AAAs over where I live
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Offline GunGodTheGreat

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Re: Glow in the Calc
« Reply #22 on: March 03, 2010, 10:06:09 pm »
ya but they are worth the price :)
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Offline DJ Omnimaga

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Re: Glow in the Calc
« Reply #23 on: March 03, 2010, 10:50:20 pm »
True, altough I felt sad when I used my TI-83+ to program in 2002 and would go through an entire set every two months :(. I finally went for the cheap dollar store batteries in pack of 12 that lasts two weeks. They lasted four times shorter, but at $1.49 for 12 it was worth the price. The only issue: the expiration dates on these generally were pretty close and sometimes one battery didn't work at all in the package. I do not recommend these if you don't use your calc often and I especially do not recommend them for Nspire usage. They are more effective for people who program
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Offline jsj795

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Re: Glow in the Calc
« Reply #24 on: March 04, 2010, 09:46:08 am »
I have total of 8 rechargeable batteries, 4 for 84 and the other 4 for 89.
And yes, I got my TI89T last saturday! :D
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Offline JoeyBelgier

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Re: Glow in the Calc
« Reply #25 on: March 04, 2010, 10:49:50 am »
((old topic revival :D ))
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Offline Zera

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Re: Glow in the Calc
« Reply #26 on: March 04, 2010, 01:01:01 pm »
Unfortunately, luminescent materials aren't that strong. They wouldn't produce a suitable amount of light to view a screen image in the dark. (especially considering the material would be located behind the screen, reducing the amount of light it might capture)

Your best bet is to use the same kind of principle found in watch backlights:

"In an Indiglo watch, a very thin panel uses high voltage to energize phosphor atoms that produce light. The panel itself is extremely simple. As described in the Timex patent, you take a thin glass or plastic layer, coat it with a clear conductor, coat that with a very thin layer of phosphor, coat the phosphor with a thin plastic and then add another electrode. Essentially, what you have is two conductors (a capacitor) with phosphor in between. When you apply 100 to 200 volts AC (alternating current) to the conductors, the phosphor energizes and begins emitting photons."

Remember that any patented device must provide instructions for how the device is assembled, so the general public can reproduce the device for themselves. You can find detailed instructions for this sort of thing online.

Having four AAA batteris to power it, this kind of lighting would probably work well without diverting much power from the calculator itself. In fact, you could shunt it over to the back-up battery, and probably operate off it for a good two hours.
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Offline Silver Shadow

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Re: Glow in the Calc
« Reply #27 on: March 04, 2010, 04:26:13 pm »
Yeah, use the backup battery to get those 200V. XD
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Offline ztrumpet

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Re: Glow in the Calc
« Reply #28 on: March 04, 2010, 05:16:30 pm »
That's a nice idea Zera!  I doubt if I try it, but it is definitely something to ponder. :)
« Last Edit: March 04, 2010, 05:16:45 pm by ztrumpet »
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Offline DJ Omnimaga

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Re: Glow in the Calc
« Reply #29 on: March 04, 2010, 09:16:32 pm »
just make sure if you mod your calc that you have a spare one in case you do something wrong :P

I myself would be scared to do anything like that with mine because I was never into messing around with electronics
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