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Development => Hardware => Topic started by: DarkestEx on December 17, 2016, 01:13:19 pm

Title: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on 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.

(https://codewalr.us/proxy.php?request=http%3A%2F%2Fuploads.tapatalk-cdn.com%2F20161217%2Fbd0bd5400dcc1f37436d3f52cb134779.jpg&hash=fd26db8603b46a2e5eb2ba45f703fde3)

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:
(https://codewalr.us/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FICM0Rne.jpg&hash=3451b0e9b9349b7ca328a737cf73abe0)
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: Juju on December 17, 2016, 07:51:26 pm
That looks real interesting, can't wait to see it done.
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: 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?
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on 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:
(https://codewalr.us/proxy.php?request=http%3A%2F%2Fdata.bmuessig.eu%2FCalculators%2FTI%2F84-Plus%2FPCB_Traces-v05-small.png&hash=e130dbc25a03c04d72dc317ea36954da)

Just compare it with the Sharp one XD:
(https://codewalr.us/proxy.php?request=http%3A%2F%2Fdata.bmuessig.eu%2FCalculators%2FSharp%2FEL-9650%2FPCB_Sharp_Traces.png&hash=c448199087aa92f6df430c53fdea63d0)
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DJ Omnimaga on December 18, 2016, 01:20:14 am
Nice Bejeweled clones

Just kidding :P
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: 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 :)
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on 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"
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: p2 on December 19, 2016, 10:15:26 am
(https://codewalr.us/walrusirc/smileys/bigfrown.gif)
:'(  :'(  :'(
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:
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: CVSoft on 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.
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on December 19, 2016, 11:52:32 am
Quote from: p2 on December 19, 2016, 10:15:26 am
(https://codewalr.us/walrusirc/smileys/bigfrown.gif)
:'(  :'(  :'(
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"
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: 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
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on 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:
(https://codewalr.us/proxy.php?request=http%3A%2F%2Fuploads.tapatalk-cdn.com%2F20161219%2F4390ae224891a052e878a1f1c5434d9d.jpg&hash=3205cb7aa2b7bc392526dced82ebdba0)

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:
(https://codewalr.us/proxy.php?request=http%3A%2F%2Fuploads.tapatalk-cdn.com%2F20161219%2F3c4d7d4b5b0dbb332da63c8f17a5219f.jpg&hash=055faf2f982031e162369292a9e8cb07)







Edit by p2: removed the "Sent from my BlackBerry DTEK50"
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on 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!

(https://codewalr.us/proxy.php?request=http%3A%2F%2Fdata.bmuessig.eu%2FImages%2FPi84%2FWP_20170714_02_43_37_scaled.jpg&hash=a1e2bb7400864adbb02dfe124c32388b)

(https://codewalr.us/proxy.php?request=http%3A%2F%2Fdata.bmuessig.eu%2FImages%2FPi84%2FWP_20170714_16_37_38_scaled.jpg&hash=947a7ed9eb4607087ab733adc86da5fa)
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: AmazoNKA on July 19, 2017, 08:37:21 pm
Looks nice
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: AmazoNKA on July 19, 2017, 08:44:27 pm
Looks nice
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on July 19, 2017, 09:04:57 pm
Quote from: AmazoNKA on July 19, 2017, 08:37:21 pm
Looks nice

Thank you :)
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: tr1p1ea on July 21, 2017, 01:01:46 am
Looking awesome, I've been messing with a bit of rpi+teensy stuff of late as well.

Will you consider a colour LCD in the future?
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DarkestEx on July 21, 2017, 05:46:58 am
Quote from: tr1p1ea on July 21, 2017, 01:01:46 am
Looking awesome, I've been messing with a bit of rpi+teensy stuff of late as well.

Will you consider a colour LCD in the future?

Nice, good luck with your project!

No, I am not going for a color LCD in the future. The first attempt on this did, but then I decided to go as close to the original as possible on this try.
I have searched high and low for this almost fitting replacement monochrome LCD ;)

Benedikt
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: tr1p1ea on July 21, 2017, 06:23:20 am
Cool, where did you source the LCD from if you dont mind me asking?

What controller does it utilise?
Title: Re: Pi84 - The Raspberry Pi powered TI-84+
Post by: DJ Omnimaga on July 27, 2017, 03:58:58 am
In any case make sure that the calc runs faster than ClassPad 3xx BASIC because I heard that it makes TI-86 BASIC look like it runs fast [emoji14]