# Graphite: Custom Graphing calculator

## What is this?

This is a custom-made graphing calculator built off of the [Rasberry Pi Picos](https://www.raspberrypi.com/products/raspberry-pi-pico/).
There are a couple of reasons I chose this board: 
1. they're cheap, and easy to get a hold of.
2. if a new one (with the same form factor and compatible pinout) comes out, you can swap it out, giving you a more powerful cpu, more storage, etc.

## But _Why_ did you make this?

I made this because this is my first ever PCB and thing like this. _Also_, I really wanted to fix some things that I found wrong with the TI-84s and such.

## Bill of Materials:

PCB components: 
| Name | Buy Website | Price | Notes |
| --- | --- | --- | --- |
| 2.2" TFT LCD | https://www.adafruit.com/product/1480 | $24.95 | Just have to use a generic 10 pin thingy 🤷 |
| Rasberry Pi Pico | https://www.adafruit.com/product/4864 | $6.00 |  |
| Buttons | https://www.mouser.com/ProductDetail/Omron-Electronics/B3F-1000?qs=lK7M36XCk6JQHckSc1xIsg%3D%3D | $0.25 | (that's for one, gets cheaper the more you buy yay) |
| male headers | https://www.adafruit.com/product/392 | $4.95 |  |
| 10 pin female headers | https://www.sparkfun.com/header-10-pin-female-pth-0-1.html | $0.80 |  |
| 20 pin female headers | https://www.adafruit.com/product/4155 | $2.50 |  |
|  | Total | $39.45 |  |

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![](https://hc-cdn.hel1.your-objectstorage.com/s/v3/0f966fbdf2ac45c8ce0e0cea5558c57428af2e90_screenshot_from_2025-06-27_13-22-37.png)
![](https://hc-cdn.hel1.your-objectstorage.com/s/v3/531142545bdc04ec532ca752394d438c9cbeed67_screenshot_from_2025-06-27_13-22-11.png)
![](https://github.com/thelegendofmario/graphite/blob/main/.github/pcb.png)
> project images