Calculator

hdkghc·calculator·hardware/kicad/calculator.kicad_pcb

About the Calculator PCB

Calculator is an open source RP2040/RP2350 PCB design by hdkghc, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 81.3 × 131.4 mm, with 61 components from 18 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the Arduino_Nano_v2.x and TFT. By type, the board carries 37 switches, 14 resistors, 3 ICs, 3 capacitors, 2 transistors and 2 connectors.

From the project

A computer algebra system project written in C++, built for the i.MX RT1011 crossover MCU.

A scientific/graphical calculator firmware for Raspberry Pi Pico, with CAS (Computer Algebra System) and graphical display support.

Status: Under active development. Core CAS and display subsystem are partially implemented; basic arithmetic, expression parsing, and simplification are functional. Integration and matrix operations are in progress.

- CAS core: expression parsing, simplification, differentiation, integration (partial), rational arithmetic, symbolic manipulation. - Display: 1.8" ST7735 TFT (160×128) with custom font rendering (ClassWiz-style fonts included). - Input: 6×6 matrix…

Calculator, from the project README — From the project README

Main components on the Calculator

Pico Arduino_Nano_v2.x TFT

Calculator bill of materials (BOM)

61 components, 18 distinct parts.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
1	Arduino_Nano_v2.x	Arduino_Nano	U2
1	TFT	MSP1803_TFT_12pin	U3
1	BC547	TO-92_Inline_Wide	Q1
1	S8550	TO-92_Inline_Wide	Q2
1	Jack-DC	BarrelJack_Kycon_KLDX-0202-xC_Horizontal	J1
1	AudioJack3_SwitchTR	Jack_3.5mm_CUI_SJ1-3525N_Horizontal	J2
36	SW_Push	SW_PUSH_6mm	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +28
1	SW_DIP_x04	SW_DIP_SPSTx04_Slide_6.7x11.72mm_W7.62mm_P2.54mm_LowProfile	SW37
1	100nF	C_Disc_D6.0mm_W2.5mm_P5.00mm	C1
1	25V 100uF	CP_Radial_D8.0mm_P3.50mm	C2
1	100nF	C_Disc_D7.0mm_W2.5mm_P5.00mm	C3
2	330R	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2
5	4k7	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R4, R5, R6, R14
4	100k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R7, R8, R12, R13
1	1M	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R9
1	470k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R10
1	10k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R11

Calculator design files

The KiCad project lives in the hdkghc/calculator repository on GitHub; these links point at the commit this page was built from.

Layouthardware/kicad/calculator.kicad_pcb
Schematichardware/kicad/calculator.kicad_sch

Calculator: common questions

What microcontroller does the Calculator use?

The Calculator is built around the Pico, from the RP2040/RP2350 family.

How big is the Calculator PCB?

The Calculator measures 81.3 × 131.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Calculator?

61 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Calculator design files?

From the hdkghc/calculator repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Calculator design in my own project?

Yes, under the terms of its GPL-3.0 license, which hdkghc chose for the repository.

Can I test firmware for the Calculator without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.