jerryberry
Posts: 3
Joined: Sun Sep 09, 2012 9:59 pm

Raspberry Pi as a graphing calculator

Sat Sep 15, 2012 5:21 pm

Hi, I bought the raspberry pi and I would like to maybe use it as a portable graphing calculator (that can do so much more!). I am very new to electronics work and I am on a budget of 40--50 dollars in finding a battery pack that will last a long time and a screen in order to interact with it. I found a ti-84 emulator (http://lpg.ticalc.org/prj_tilem/) and maybe was planning attaching a numberpad as well to it to make it easier to use later on. Any suggestions are helpful, thanks for your time.

tetravalence
Posts: 16
Joined: Thu Jul 19, 2012 5:14 pm

Re: Raspberry Pi as a graphing calculator

Sun Sep 16, 2012 7:43 am

Instead of the TI-84 emulator, you may also want to try out the sympy Python library. That'd require using a keyboard, however.

jerryberry
Posts: 3
Joined: Sun Sep 09, 2012 9:59 pm

Re: Raspberry Pi as a graphing calculator

Sun Sep 16, 2012 11:49 pm

Thats interesting to know, but does anyone have any suggestions as to keep power consumption to a minimum. Will I be able to use a usb numberpad as well?

jerryberry
Posts: 3
Joined: Sun Sep 09, 2012 9:59 pm

Re: Raspberry Pi as a graphing calculator

Sun Sep 16, 2012 11:50 pm

But I want it to have a UI similar to TI-84 calculators, that is why I choose that certian emulator.

inder
Posts: 23
Joined: Wed Aug 22, 2012 7:44 pm

Re: Raspberry Pi as a graphing calculator

Mon Sep 17, 2012 1:10 am

Check out this thread. I'll be curious to see how you progress.
http://www.raspberrypi.org/phpBB3/viewt ... 63&t=17564

noahkiser95
Posts: 4
Joined: Tue Jun 10, 2014 3:24 pm

Re: Raspberry Pi as a graphing calculator

Tue Jun 10, 2014 3:53 pm

I am doing the same thing, and I am using:
this display: http://www.amazon.com/3-5-Inch-TFT-Moni ... B0045IIZKU
- with mods for running on 5 volts: http://skpang.co.uk/blog/archives/541#comment-452
this power pack: http://www.amazon.com/10000mAh-Technolo ... sb+battery
this emulator: http://lpg.ticalc.org/prj_tilem/
- which starts on boot: http://wiki.lxde.org/en/Autostart (just change wicd-client -n with tilem2)
- and changed the native resolution for smaller size and proper ratio: http://www.endlick.com/changing-the-scr ... an-wheezy/ (you want the height to be about 250 to 300, and the width 1.5x the height for the emulator)
and a homemade, 50 button keypad, using a technique like this: http://www.instructables.com/id/Hacking-a-USB-Keyboard/
- where I remapped the TilEm keys to fit my keypad: http://contra-sh.users.sourceforge.net/ ... 1-660007.2

2 extra buttons were added (left alt and F11) on the side so the emulator can be put into fullscreen
I cut a case and buttons out of wood, it is quite bulky, but it works. It is a bit over your budget, but hey, not everything can be cheap.

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