2 layers83.3 × 65.3 mm
SimonShield
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46 parts14kMIT
2 layers80 × 100 mm
Calc project
rod520/calc-projectPCB design of an rpi pico based calculator
- Size
- 80 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 46
- Pads
- 203
- Tracks, vias
- 242, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Jun 2026
- Updated
- 8 Aug 2026
Overview
Calc project is an open-source printed circuit board by rod520, from the rod520/calc-project repository on GitHub, published under the Unlicense licence. It is a 2-layer board of 80 × 100 mm with 46 parts on 46 nets, routed with 242 tracks and 0 vias.
Its parts include 36 switches and 3 connectors.
README
README.mdPico Calc electronics design
the electronics portion of an rpi Pico based calculator
BOM:
design:
The pcb consists of two separated sections, the button matrix and the display connection, connected to an rpi with headers through 2 through hole pin connectors. Buttons are 6mm through hole, display is an MSP3217 (no touch screen), connector is 1x20 2.54mm. IMPORTANT: the male header pins should be pointed down for access to bootsel, and the pico's usb port should be pointed outside, to the right if viewed from above.
software:
see zig-calc for software, and also button overlay.
WHY?
I wanted to make a clone of the numworks calculator, but I realized that wasnt feasible and cheap, so I eventually landed on making a pi-hat like extension for an rpi pico. The pico clone Pimoroni LiPo Pico can connect to an optional Lithium Ion Battery, so this calculator will (eventually) have nearly every feature of the numworks, albeit with a vertical display, thicker case, and cheap clicky buttons.
materials:
- 36 6mm through hole tactile buttons
- 2 1x20 female/socket connectors, 2.54 mm, I'm planning on using Adafruit's short socket headers
- 2 matching 1x20 male/pin connectors, 2.54 mm, I'm planning on using Adafruit's short pin headers, or you can stick with the pico's default
- MSP3217 or MSP3218, both work, but you will not be able to use the MSP3218's touchscreen
- soldering materials
- an rpi pico, with headers facing down, (OPTIONAL) pimoroni lipo pico in case you want to use a rechargeable battery
- (OPTIONAL) a JST-PH battery for the pimoroni lipo pico
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 36 | SW_Push_45deg | Library:SW_PUSH_6mm_centered | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +20 |
| 5 | MountingHole | MountingHole:MountingHole_2.1mm | H1, H2, H3, H4, H5 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | Conn_01x14 | Library:castel_toScreen | J3 |
| 1 | PinSocket_1x20_Left | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical | J2 |
| 1 | PinSocket_1x20_Right | Connector_PinSocket_2.54mm:PinSocket_1x20_P2.54mm_Vertical | J1 |
Questions
How big is the Calc project PCB?
It measures 80 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Calc project use?
46 parts. 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 Calc project KiCad files?
From the rod520/calc-project repository on GitHub, at the commit this page was made from: the board is calc-project.kicad_pcb and its schematic calc-project.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Calc project design in my own project?
Its repository publishes it under the Unlicense licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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