2 layers72.8 × 32 mm
2 layers86.4 × 177.8 mm
Graphite
diflouroethane/graphiteThis is a custom-made graphing calculator built off of the Rasberry Pi Picos. There are a couple of reasons I chose this board: 1. they're cheap, and easy to get a hold of. 2.
- Size
- 86.4 × 177.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 102
- Nets
- 183
- Pads
- 350
- Tracks, vias
- 464, 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 May 2025
- Updated
- 30 Jun 2025
Overview
Graphite is an open-source printed circuit board by diflouroethane, from the diflouroethane/graphite repository on GitHub. It is a 2-layer board of 86.4 × 177.8 mm with 102 parts on 183 nets, routed with 464 tracks and 6 vias.
It is built around the B3F-1000. Its parts include 50 diodes, 50 switches and 1 connector. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdGraphite: Custom Graphing calculator
What is this?
This is a custom-made graphing calculator built off of the Rasberry Pi Picos. There are a couple of reasons I chose this board:
- they're cheap, and easy to get a hold of.
- 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 |
project images
Parts
102| Qty | Value | Footprint | References |
|---|---|---|---|
| 50 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +34 |
| 50 | B3F-1000 | B3F_1000:B3F1002 | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +34 |
| 1 | Adafruit TFT | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J1 |
| 1 | RaspberryPi_Pico | Module:RaspberryPi_Pico_Common_THT | A1 |
Questions
How big is the Graphite PCB?
It measures 86.4 × 177.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Graphite use?
102 parts, built around the B3F-1000. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Graphite KiCad files?
From the diflouroethane/graphite repository on GitHub, at the commit this page was made from: the board is hardware/graphite.kicad_pcb and its schematic hardware/graphite.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Graphite design in my own project?
Its repository states no licence, so its author keeps all rights: ask diflouroethane before reusing the design.
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