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Author Topic: "Drop-In" PCB Hardware Mod for the TI-83+SE  (Read 18538 times)

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Offline Sorunome

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #15 on: December 02, 2013, 01:16:56 pm »
This sounds like an awesome project, keep up the great work! O.O
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Offline Geekboy1011

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Re: Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #16 on: December 02, 2013, 01:18:27 pm »
Links to any documentation on that would be wonderful. That seems awesome!
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Offline Streetwalrus

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #17 on: December 02, 2013, 01:20:55 pm »
Well there's a link in the description. It uses the frontlight from the majority of the GBA SP.
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Offline Geekboy1011

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Re: Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #18 on: December 02, 2013, 01:24:48 pm »
I'm on my phone that's why I didn't see it lol
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Offline Geekboy1011

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #19 on: December 02, 2013, 04:46:18 pm »
So this is what i was thinking about LED light bar



Just a small rob embedded on the side of the screen that you pick up(well push on the bottom of in this case) and it shines A light onto the screen. Will look a lot more professional then the screenshot of course ^^

Note the rod is embedded in the screen so its flush I just messed up the drawing.
« Last Edit: December 02, 2013, 04:49:15 pm by Geekboy1011 »
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Offline willrandship

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #20 on: December 03, 2013, 12:05:42 am »
On that SD card, if you avoid implementing a filesystem you could do it a lot more easily. Since you have USBHID anyway, why not just make it completely internal? Then you can just treat it as extra Flash.
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Offline Geekboy1011

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #21 on: December 03, 2013, 12:47:24 am »
because thats In my opinion more work. I Can have the arduino handle all the file system jargon and pass info back via the ti-link protocol or calcnet depending on what the scenario is. that is in my honest opinion easier.
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Offline willrandship

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #22 on: December 03, 2013, 01:45:59 am »
That's probably true thanks to FAT libs for the arduino. Coding a FAT driver would push it over the edge, though.
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Offline Geekboy1011

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Re: Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #23 on: December 03, 2013, 09:30:17 am »
I also have the thought to use cn2 to make more storage accessible via the arduino and SD card by allowing arbitrary file writing.
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Offline ben_g

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #24 on: December 03, 2013, 03:34:43 pm »
It would be awesome if you could handle the sd card as internal flash, and that you can make it possible for applications to run from it (witouth needing a transfer), but I don't know if this is even possible because of the different types of flash.
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Offline Keoni29

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #25 on: December 03, 2013, 03:58:58 pm »
No you cannot execute from an sd card. You'd have to load the data to ram first.
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Offline Geekboy1011

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Re: Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #26 on: December 03, 2013, 04:30:22 pm »
In theory I could write a shell that would copy the data from the SD card to ram and run it.  Will I want to do that.  No.  Will I post enough documentation on how so someone else can.  Yes.  Will I be very happy if someone did yes. Because in all honesty I expect my self to write a self contained calcnet stub on the arduino chip that will allow you to interface with the SD card directly over calcnet. which means all you need to do is pass information to the arduino via a specific pattern/form and it will send the proper information back. I need to talk to KermM about the feasibility of this tho because it would have to abuse Calculator Id's as command codes to help make it as efficient as possible but it should be doable. (this is read I'm afraid of running out of space on the micro controller it self...i wonder if there is a library to load binary blobs off the sd card or something...)
« Last Edit: December 03, 2013, 05:31:26 pm by Geekboy1011 »
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Offline Geekboy1011

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #27 on: January 30, 2014, 04:59:31 pm »
So I have been working on the schematic slowly and surely. But I am kinda at a crucial decision making portion of this project. That is what battery do we want to use. I'm trying to balance size+capacity+price. I pretty much need help finding a good place to source these. I will be looking at digikey and mouser. But for anything other then discretes they have been seemingly pricey to me.

I will report back soon with the space we have on the high end to fit the circuitry and the battery in.

Seems to be 2"x1.5"x1/4" space for the battery or smaller. Hope we can find something that fits. And the height is an estimate there might be a little more or a little less then a 1/4" I am honestly not to sure based on pcb layout and such we can fudge it a little tho


Digikey had nothing that would work nor did mouser. Any suggestions on where else to search?
« Last Edit: January 30, 2014, 05:36:22 pm by Geekboy1011 »
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Offline Keoni29

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Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #28 on: January 31, 2014, 06:12:50 am »
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Offline Geekboy1011

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Re: Re: "Drop-In" PCB Hardware Mod for the TI-83+SE
« Reply #29 on: January 31, 2014, 11:23:56 am »
I am currently looking at using an old phone battery.  I feel it's going to be more reliable then anything I can find on alibaba :p

Cross post from Cemetech
Quote
http://www.ebay.com/itm/OEM-MOTOROLA-SNN5794A-Battery-RAZR-V3-V3a-V3C-V3M-780-mAh-/161119556525

Thinking of using this as the battery for this project. It has a rating of 180mAh and Preliminary maths show that the run time should be suitable for use in this application(upwards of 16 hours screen on time on normal/moderate load) . It brings up a small side project with it though, There are 4 pins on the battery and we think 2 of them are I2C lines. So we are going to probe them to see what we can get back from them!
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