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Graphing-Calculator-Project

This project is to serve as an alternative calculator to the infamous Texas Instruments Ti-84 Graphing Calculator. It uses a single Atmega2560 to perform calculations and then drive the actual display. There is a multiplexed keypad along with 8 debounced buttons for input. The Arduino Mega uses that information to perform operations and graph functions similar to how a Ti-84 would do it. (Not quite, but similar). There are also status LED's implemented for visual debug and aesthetic.

Project Author(s)

Ilan Rodriguez

Motivation

I needed a calculator earlier in my senior high school year, so I decided to build one from scratch. However, it took significantly longer than expected. Thus, by the time I finished, I didn't actually need it. It's still cool to have nonetheless. Plus, making a calculator at this level exercised my programming and planning skills.

Originally, I built BCD Full-Adders in minecraft with redstone and mods. Once my computer couldn't run all demands of the game at that stage, so I decided to build a computer with real hardware. However, I do not know enough Computer Engineering design to build a computer from discrete logic.

Building this calculator is a closer alternative in that it can be made tangible sooner.

Installation

  1. Compile, and upload to an Arduino Atmega2560.
  2. Plug TFT Display shield on the mega.

Materials

*3.5" IPS TFT LCD Display ILI9486/ILI9488 480x320 36 Pins for Arduino Mega2560 * x 1

ATMEL ATTINY84-20PU 8-BIT 20MHz MCU (2 PACK) x 1

SunFounder Mega 2560 R3 ATmega2560-16AU Board (compatible with Arduino) x 2

Sparkfun Pocket AVR Programmer x 1

3mm and 5mm Assorted Clear LED Light Emitting Diodes 5 Colors Pack of 300

PIXNOR 1/4W Resistor Kit 56 Values x 20pcs =1120pcs (1ohm-10Mohm) Metal Film Resistors Assortment

CO-RODE Tact Button Switch 6x6x5mm Pack of 100

SainSmart IIC/I2C/TWI Serial 2004 20x4 LCD Module Shield For Arduino UNO MEGA R3 x 1

Additional Credits to Library Authors:

Kris Kasprzak for Graphing Library
Bodmer for HX8357B, HX8357C, ILI9481 and ILI9486 Libraries

https://github.com/Bodmer/TFT_HX8357

Sudar Muthu for MemoryFree Library

https://github.com/sudar/MemoryFree

RobTillaart for Arduino Code

https://github.com/RobTillaart

Jeremy Gillick for LED Fader Library

https://github.com/jgillick/arduino-LEDFader

Nick Gammon for BigNumber Library

https://github.com/nickgammon/BigNumber

MCUdude for providing board definitions on non-standard Arduino Chips

https://github.com/MCUdude/MightyCore and https://github.com/MCUdude/MiniCore

SainSmart Manufacturer for providing the library in handling the 20x4 LCD

Images

img_graph

License

baboomerang/Graphing-Calculator-Project
Copyright (C) <2017>  <Ilan Rodriguez>, <et-al>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.