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Author Topic: TI-84+ On An External Power Supply - Hardwired  (Read 10757 times)

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Offline Iambian

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TI-84+ On An External Power Supply - Hardwired
« on: January 20, 2012, 09:48:34 pm »
Since what I'm doing with my calculator will eat too many batteries across what it's doing (it's a secret), I strapped my calculator down to a breadboard and hooked in a spare stripped cellphone charger to supply it with the juice that it needs for the fraction of the price. And so, I leave this with you:



The tape probably wasn't necessary but I wanted it strapped in good. Also, this makes operating the calc a bit more difficult. Whatever works, I guess. The voltage source is probably 5V. Not sure. Most likely. It's a cellphone charger after all. Doesn't really matter to me. Just as long as the calc powers on and doesn't complain to me about low batteries. Which it did when I had a 5V regulator in the circuit (leftover from a previous project). That's what the capacitors were in for, but I guess they might help keep the calc going long enough to reach a place where it can shut down if the power cuts. I haven't tested that one. Should I?

And no, my calc isn't trying to call out for help... yeah. Let's go with that. I was just... um. Too lazy to shoot another photo? Right, right, exactly! That'll be my story. It's believable, right?

EDIT: Quick 15-30 minute project. Most of that time spent was in locating the supplies.
« Last Edit: January 20, 2012, 09:53:19 pm by Iambian »
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Offline Juju

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #1 on: January 20, 2012, 09:50:57 pm »
Well, that's pretty nice what you did there Iambian.
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Offline Xeda112358

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #2 on: January 20, 2012, 10:29:31 pm »
I had a random piece that I found once that had a USB tip on one end and a charging tip on the other (round). I use that often  to keep my calc operating when I need to charge my batteries and still use my calc. All I do is cram a wire inside and wrap another wire on the outside and those go to the two terminals on my calc.
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Offline Builderboy

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #3 on: January 20, 2012, 10:57:35 pm »
What has science done???

On a more serious note, I can't wait to find out what your secret project is ^^ My best guess is something to do with overclocking, as a backlight and wifi would need *more* power, not just a reliable source of the same power.
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Offline TIfanx1999

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #4 on: January 21, 2012, 02:37:51 am »
I saw this earlier on irc, pretty cool stuff. ^^ No idea what mad science you're cooking up, but I can't wait to see! =)
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Offline Spyro543

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #5 on: January 21, 2012, 08:43:19 am »
Look at the calc screen. ^^

EDIT: To make this post worthwhile:
That is a neat thing you did there! I've been looking for a way to power my calc like that.
« Last Edit: January 21, 2012, 08:45:24 am by Spyro543 »
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Offline Xeda112358

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #6 on: January 21, 2012, 09:43:41 am »
XD Yes, the calc screen is quite lovely :)
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Offline Darl181

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #7 on: January 21, 2012, 12:07:19 pm »
Wow, I thought I had a lot of the keys worn off, yet then I look at this one.. 0.o

Sounding pretty good, tho.
« Last Edit: January 21, 2012, 12:07:29 pm by Darl181 »
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Offline Hot_Dog

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #8 on: January 21, 2012, 02:42:16 pm »
Wow, that's impressive
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Offline ralphdspam

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #9 on: January 21, 2012, 02:54:04 pm »
Cool! 
I wonder if you can plug it into USB and draw the 5V from that...
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Offline Xeda112358

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #10 on: January 21, 2012, 04:39:06 pm »
Quote from: ralphdspam on January 21, 2012, 02:54:04 pm
Cool! 
I wonder if you can plug it into USB and draw the 5V from that...
Do you mean like from the USB port on your calc?
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Offline ralphdspam

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #11 on: January 21, 2012, 05:02:01 pm »
Quote from: Xeda112358 on January 21, 2012, 04:39:06 pm
Quote from: ralphdspam on January 21, 2012, 02:54:04 pm
Cool! 
I wonder if you can plug it into USB and draw the 5V from that...
Do you mean like from the USB port on your calc?
Yeah, if you plug it into the computer and draw the five volts from the calc's USB port.
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Offline Xeda112358

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #12 on: January 21, 2012, 05:42:39 pm »
Hmm, that would probably require more hardware modding, but I am sure it is possible to do. Add a gate that switches which power input to use. If there is energy coming from the USB, use USB energy, otherwise, just use batteries. I've been thinking about making it charge my rechargeables, too :D
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Offline Iambian

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #13 on: January 22, 2012, 01:21:10 am »
After hooking my calc up to the cellphone charger, which ought to be outputting 5V, I was thinking about trying to wire up something that would draw power from the 5V line of the USB port if the power was available. Just scrape off a little bit of the green stuff and solder a wire to it, then right on over to a small circuit board that deals with the batteries.

I did the scrape-y thing before with a Super Gameboy cartridge after some of its smaller contacts corroded right off. My granddaddy bought me that thing from a garage sale once, but it didn't work so yeah. Didn't really know how to repair a PCB at the time, so that was the only logical solution I had at the time. Took my dad a helluva lotta convincing to buy me that soldering iron.
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Offline Yeong

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Re: TI-84+ On An External Power Supply - Hardwired
« Reply #14 on: January 22, 2012, 01:58:25 pm »
lol at the calc screen XD
It is awesome indeed. :)
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