BullIso

ScatteredDrifter·BullIso·pcb/pcb.kicad_pcb

About the BullIso PCB

BullIso is an open source RP2040/RP2350 PCB design by ScatteredDrifter, published on GitHub under the MIT license. It is a 2-layer board measuring 257.2 × 89.2 mm, with 117 components from 29 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the W25Q128JVS and C347376. By type, the board carries 65 switches, 23 diodes, 15 capacitors, 5 connectors, 5 resistors and 3 ICs.

It belongs with the keyboards designs in this gallery.

From the project

replacement Board for the Bully, Featuring ISO-Enter

A replacement Board for the Bully, incorporating an ISO-Enter. You can find the original bully here

Measurements for the pcb were taken from the available plate-files.

On the verge to build this keyboard your own? For building one yourself you require the following: - this pcb - a unified daughterboard ( the old version with Jst-connectors) - the correct case - tadpole mounds ( just like for the original pcb)

BullIso, from the project README — From the project README

Main components on the BullIso

W25Q128JVS RP2040 C347376

BullIso bill of materials (BOM)

117 components, 29 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	W25Q128JVS	SOIC-8_5.23x5.23mm_P1.27mm	U2
1	RP2040	RP2040-QFN-56	U3
1	C347376 XC6206P Smaller footprint, less mA ~.5	SOT-23	U4
1	C9002 12MHZ Crystal	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y0
1	BREAKOUT	PinSocket_1x05_P2.54mm_Vertical	J1
1	CONN_01X03_MALE Conn_01x03_Male	PinSocket_1x03_P2.54mm_Vertical	J2
1	CONN_01X04_FEMALE Conn_01x04_Female	JST-SR-4	J3
1	3x Breakout \| additional pins	PinHeader_1x03_P2.54mm_Vertical	J4
1	Breakout 1.1v	PinHeader_1x02_P2.54mm_Vertical	J5
1	MX_stab	STAB_MX_P_2u	S1
2	MX_stab	STAB_MX_P_3u	S3, S7
1	MX_stab	STAB_MX_P_2.25u	S4
1	MX_stab	STAB_MX_6u	S5
1	MX_stab	STAB_MX_6.25u	S6
1	MX_stab	STAB_MX_P_2.75u	S8
51	MX_SW_solder	SW_MX_1u	SW2, SW3, SW4, SW5, SW5_1, SW6, SW7, SW8 +43
1	2.25	SW_MX_1u	SW17
2	3	SW_MX_1u	SW21, SW29
1	2.75	SW_MX_1u	SW25
1	6u	SW_MX_1u	SW34

Show 9 more

Qty	Part	Footprint	Refs
2	C2886894 RESET	SW_SPST_TL3342	SW9998, SW9999
23	BAV70	SOT-23	D1, D2, D3, D4, D5, D6, D7, D8 +15
3	10U 10u	C_0805_2012Metric	C1, C4, C17
2	22PF 22pf	C_0805_2012Metric	C2, C3
8	100N 100n	C_0805_2012Metric	C5, C6, C7, C9, C11, C12, C13, C14
2	1u	C_0805_2012Metric	C8, C10
2	1k	R_0805_2012Metric	R1, R5
2	27	R_0805_2012Metric	R3, R4
1	10K 10k	R_0805_2012Metric	R8

BullIso design files

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

BullIso: common questions

What microcontroller does the BullIso use?

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

How big is the BullIso PCB?

The BullIso measures 257.2 × 89.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BullIso?

117 components, from 29 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 BullIso design files?

From the ScatteredDrifter/BullIso 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 BullIso design in my own project?

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

Can I test firmware for the BullIso 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.