Butns

jhbruhn·butns·hardware/board/butns.kicad_pcb

About the Butns PCB

Butns is an open source RP2040/RP2350 PCB design by jhbruhn, published on GitHub under the MIT license. It is a 2-layer board measuring 99 × 99 mm, with 260 components from 7 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the 74LVC1G17. By type, the board carries 128 diodes, 65 capacitors, 64 switches, 2 ICs and 1 connector.

It belongs with the displays & leds designs in this gallery.

From the project

a small grid 64 clone

small grid 64 clone heavily based on previous work by hugelton/btns.

Uses a Rasperry Pi Pico Microcontroller, NeoPixel RGB LEDs (SK6812), cheap buttons and a 3d-printed case and button-overlay. Includes hardware and firmware support for an optional tilt-sensor.

It is highly recommended to order the PCB assembled from JLCPCB. That assembly will include everything other than the parts in the BOM.

Butns, from the project README — From the project README

Main components on the Butns

Pico 74LVC1G17

Butns bill of materials (BOM)

260 components, 7 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
1	74LVC1G17	SOT-23-5_HandSoldering	U2
1	CONN_01X08 Conn_01x08	PinHeader_1x08_P2.54mm_Vertical_SMD_Pin1Left	J1
64	SW_Push	SW_Push_1P1T_XKB_TS-1187A	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +56
64	SK6812-EC20	SK6812-EC20	D1, D66, D67, D68, D69, D70, D71, D72 +56
64	1N4148WS	D_SOD-323	D2, D3, D4, D5, D6, D7, D8, D9 +56
65	100NF 100nF	C_0603_1608Metric	C1, C2, C3, C4, C5, C6, C7, C8 +57

Butns design files

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

Layouthardware/board/butns.kicad_pcb
Schematichardware/board/butns.kicad_sch
BOMhardware/board/jlcpcb/production_files/BOM-butns.csv

Butns: common questions

What microcontroller does the Butns use?

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

How big is the Butns PCB?

The Butns measures 99 × 99 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Butns?

260 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Butns design files?

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

Can I use the Butns design in my own project?

Yes, under the terms of its MIT license, which jhbruhn chose for the repository.

Can I test firmware for the Butns 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.