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Pi84 - The Raspberry Pi powered TI-84+

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b/Hardware publicado por u/DarkestEx December 17, 2016, 01:13:19 PM
Hello together!

This is my second go on a Raspberry Pi hearted TI-84+. (Note to mods: I really want to make this a new project without any affiliation to the old so I need a new topic).

I have decided for an early hardware version of the 84+ as it's PCB can be cut smaller than on the new versions.
For the keyboard and power management, I am going to use a Teensy 3.2 that will hook up to the 84+'es matrix.



The Raspberry Pi Zero is the perfect solution for the CPU since it is the smallest and the least power-hungry of all Raspberry Pi's.
For the power supply I will be using a slim power bank or an old Samsung Galaxy S3 mini battery (depending on how much space I have left).

To keep the authenticity, I am sticking to a monochrome LCD, however, mine is 128x64px and has the same physical size as the original screen:
Last Edit: December 17, 2016, 02:10:36 PM by DarkestEx
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u/Yuki December 17, 2016, 07:51:26 PM
That looks real interesting, can't wait to see it done.
u/Dream of Omnimaga December 17, 2016, 09:05:18 PM
Nice, is that a backlit LCD? I am curious about if the entire calc keypad will be functional?
u/DarkestEx December 17, 2016, 10:03:11 PM
Quote from: Juju on December 17, 2016, 07:51:26 PM
That looks real interesting, can't wait to see it done.
Thanks, I'll keep you all updated :)

Quote from: DJ Omnimaga on December 17, 2016, 09:05:18 PM
Nice, is that a backlit LCD? I am curious about if the entire calc keypad will be functional?
No, I will be removing the backlight as there is no space for it. But yes, the entire keypad will be functional. It will even get mouse emulation.

So I have now also created a better graphic of the keypad matrix:


Just compare it with the Sharp one XD:

Last Edit: December 17, 2016, 10:32:23 PM by DarkestEx
u/Dream of Omnimaga December 18, 2016, 01:20:14 AM
Nice Bejeweled clones

Just kidding :P
u/p2 December 19, 2016, 09:54:31 AM
*pretending I dont know you killed a functional calc for that project*  :ninja:

it looks really interesting!! :D
Can't wait for an update @DarkestEx :)
u/DarkestEx December 19, 2016, 10:11:21 AM
Quote from: p2 on December 19, 2016, 09:54:31 AM
*pretending I dont know you killed a functional calc for that project*  :ninja:

it looks really interesting!! :D
Can't wait for an update @DarkestEx :)
I scrapped about 4 calcs so far for this reiteration of the project.



Edit by p2: removed the "Sent from my BlackBerry DTEK50"
Last Edit: December 19, 2016, 12:49:16 PM by p2
u/p2 December 19, 2016, 10:15:26 AM

:'(  :'(  :'(
where do you take the money for all those calcs...? xDIt has to be like 300-350€ for them? xD

btw is the 84+SE still produced? Or are you sacrificing the last ones of a dying species...?  :ninja:
u/CVSoft December 19, 2016, 10:47:21 AM
Quote from: p2 on December 19, 2016, 10:15:26 AM
btw is the 84+SE still produced? Or are you sacrificing the last ones of a dying species...?  :ninja:
It's still in production by Kinpo Philippines.
u/DarkestEx December 19, 2016, 11:52:32 AM
Quote from: p2 on December 19, 2016, 10:15:26 AM

:'(  :'(  :'(
where do you take the money for all those calcs...? xDIt has to be like 300-350€ for them? xD

btw is the 84+SE still produced? Or are you sacrificing the last ones of a dying species...?  :ninja:
I have about 6 working 84+ and 2 broken ones.
Some i bought on eBay but most ones from my previous school which is of course getting rid of them as Germany is moving away from graphic calculators.







Edit by p2: removed the "Sent from my BlackBerry DTEK50"
Last Edit: December 19, 2016, 12:49:05 PM by p2
u/p2 December 19, 2016, 12:03:21 PM
how much do you pay for them aaand if they want to get rid of another load, do you think you could contact me? I'd take a few as well O.O
u/DarkestEx December 19, 2016, 12:45:18 PM
Quote from: p2 on December 19, 2016, 12:03:21 PM
how much do you pay for them aaand if they want to get rid of another load, do you think you could contact me? I'd take a few as well O.O
You could buy one cheap if you really wanted ;)

Btw for the second Calc I am using a currently still fully working casio classpad:


So to clear it up, I am building two calcs. One ti84 and one with the classpad. But the classpad one is not for me.


Edit:








Edit by p2: removed the "Sent from my BlackBerry DTEK50"
Last Edit: December 20, 2016, 03:36:30 PM by p2
u/DarkestEx July 14, 2017, 02:49:55 PM
Hola!

I have an update for y'all!

The display is now finally installed and working. ;D
I have also drafted the schematics and ordered the missing parts.

Let's get this one made!




Last Edit: July 14, 2017, 02:52:24 PM by DarkestEx
u/AmazoNKA July 19, 2017, 08:37:21 PM
Looks nice
u/AmazoNKA July 19, 2017, 08:44:27 PM
Looks nice
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