2 layers340 × 131 mm Model b, the printed circuit board in 3D

Model b

A 75% keyboard based on the RP2040 - with hotswappable switches, OLED display and rotary encoder

Size: 340 × 131 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 240
Nets: 145
Pads: 982
Tracks, vias: 1,734, 180
Pours: 3
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 19 Jun 2024
Updated: 21 Dec 2024

Overview

Model b is an open-source printed circuit board by TrojanPinata, from the TrojanPinata/Model-B repository on GitHub. It is a 2-layer board of 340 × 131 mm with 240 parts on 145 nets, routed with 1,734 tracks and 180 vias.

It is built around the RP2040, 0805L050WR and 1N4002W. Its parts include 84 diodes, 55 switches, 18 capacitors, 15 resistors and 1 IC. It belongs with the lEDs and displays and keyboards and input boards and the RP2040 boards of this library.

Main components

README

README.md

Model-B

A 75% keyboard based on the RP2040 MCU with hotswappable switches, OLED display, and rotary encoder.

The Model-B is the second keyboard I've developed and aims to be the direct successor to the Model-K. I made this with the intention to develop a hotswappable keyboard which uses SMD components in order to reduce soldering overhead and learn microcontroller hardware development. The case is clear acrylic with a delrin switchplate and holds a eleven degree angle, and is reasonably heavy - a much more complete feel compared to the Model-K.

See what_is_this.md for some info regarding why I made this and some of the specifics for getting setup.

Features

75% layout
Hotswappable switches
Primarily SMD PCB
Completely laster cut housing
128x32 OLED display
Chip viewing window

Photography by Kobe Brian!

Parts

240

Qty	Value	Footprint	References
83	D	Diode_SMD:D_SOD-123	D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +67
11	0.1uF	Capacitor_SMD:C_0402_1005Metric	C1, C4, C8, C9, C10, C12, C13, C14, C15, C16, C17
10			, , , , , , , , ,
9	TestPoint	libraries:CustomTestPoint	TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9
5	10k	Resistor_SMD:R_0402_1005Metric	R1, R2, R4, R6, R7
5	LOGO	LOGO	G*, G, G, G, G**
5	MountingHole_2.2mm_M2_ISO7380	MountingHole:MountingHole_2.2mm_M2_ISO7380	, , , ,
2	10uF	Capacitor_SMD:C_0402_1005Metric	C5, C6
2	1k	Resistor_SMD:R_0402_1005Metric	R3, R5
2	2.2uF	Capacitor_SMD:C_0402_1005Metric	C11, C18
2	22pF	Capacitor_SMD:C_0402_1005Metric	C2, C3
2	27	Resistor_SMD:R_0402_1005Metric	R15, R16
2	5.1k	Resistor_SMD:R_0402_1005Metric	R9, R10
1	0805L050WR	Fuse:Fuse_0805_2012Metric	F1
1	1	Resistor_SMD:R_0402_1005Metric	R14
1	100k	Resistor_SMD:R_0402_1005Metric	R11
1	12MHz	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	1N4002W	Diode_SMD:D_SOD-123	D54
1	1uF	Capacitor_SMD:C_0402_1005Metric	C7
1	200	Resistor_SMD:R_0402_1005Metric	R13
1	5.6k	Resistor_SMD:R_0402_1005Metric	R8
1	BOOT_SEL	EVQ-P7A01P:SW_EVQ-P7A01P	S1
1	Conn_01x04	Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical	OLED1
1	FB	Resistor_SMD:R_0402_1005Metric	FB1
1	HRO-TYPE-C-31-M-12	HRO-TYPE-C31-M-12:HRO-TYPE-C-31-M-12	USB1
1	RESET	EVQ-P7A01P:SW_EVQ-P7A01P	S2
1	RP2040	RP2040_minimal:RP2040-QFN-56	U3
1	SW_'	MX_Only:MXOnly-1U-Hotswap	SW53
1	SW_,	MX_Only:MXOnly-1U-Hotswap	SW64
1	SW_-	MX_Only:MXOnly-1U-Hotswap	SW25
1	SW_.	MX_Only:MXOnly-1U-Hotswap	SW65
1	SW_/	MX_Only:MXOnly-1U-Hotswap	SW66
1	SW_0	MX_Only:MXOnly-1U-Hotswap	SW24
1	SW_1	MX_Only:MXOnly-1U-Hotswap	SW15
1	SW_2	MX_Only:MXOnly-1U-Hotswap	SW16
1	SW_3	MX_Only:MXOnly-1U-Hotswap	SW17
1	SW_4	MX_Only:MXOnly-1U-Hotswap	SW18
1	SW_5	MX_Only:MXOnly-1U-Hotswap	SW19
1	SW_6	MX_Only:MXOnly-1U-Hotswap	SW20
1	SW_7	MX_Only:MXOnly-1U-Hotswap	SW21
1	SW_8	MX_Only:MXOnly-1U-Hotswap	SW22
1	SW_9	MX_Only:MXOnly-1U-Hotswap	SW23
1	SW_;	MX_Only:MXOnly-1U-Hotswap	SW52
1	SW_=	MX_Only:MXOnly-1U-Hotswap	SW26
1	SW_A	MX_Only:MXOnly-1U-Hotswap	SW43
1	SW_B	MX_Only:MXOnly-1U-Hotswap	SW61
1	SW_BACKSPACE	MX_Only:MXOnly-2U-Hotswap	SW27
1	SW_C	MX_Only:MXOnly-1U-Hotswap	SW59
1	SW_CAPS	MX_Only:MXOnly-1.75U-Hotswap	SW42
1	SW_D	MX_Only:MXOnly-1U-Hotswap	SW45
1	SW_DEL	MX_Only:MXOnly-1U-Hotswap	SW80
1	SW_DOWN	MX_Only:MXOnly-1U-Hotswap	SW78
1	SW_E	MX_Only:MXOnly-1U-Hotswap	SW31
1	SW_END	MX_Only:MXOnly-1U-Hotswap	SW83
1	SW_ENTER	MX_Only:MXOnly-2.25U-Hotswap	SW55
1	SW_ESC	MX_Only:MXOnly-1U-Hotswap	SW1
1	SW_F	MX_Only:MXOnly-1U-Hotswap	SW46
1	SW_F1	MX_Only:MXOnly-1U-Hotswap	SW2
1	SW_F10	MX_Only:MXOnly-1U-Hotswap	SW11
1	SW_F11	MX_Only:MXOnly-1U-Hotswap	SW12
1	SW_F12	MX_Only:MXOnly-1U-Hotswap	SW13
1	SW_F13	MX_Only:MXOnly-1U-Hotswap	SW54
1	SW_F2	MX_Only:MXOnly-1U-Hotswap	SW3
1	SW_F3	MX_Only:MXOnly-1U-Hotswap	SW4
1	SW_F4	MX_Only:MXOnly-1U-Hotswap	SW5
1	SW_F5	MX_Only:MXOnly-1U-Hotswap	SW6
1	SW_F6	MX_Only:MXOnly-1U-Hotswap	SW7
1	SW_F7	MX_Only:MXOnly-1U-Hotswap	SW8
1	SW_F8	MX_Only:MXOnly-1U-Hotswap	SW9
1	SW_F9	MX_Only:MXOnly-1U-Hotswap	SW10
1	SW_FN	MX_Only:MXOnly-1U-Hotswap	SW75
1	SW_G	MX_Only:MXOnly-1U-Hotswap	SW47
1	SW_H	MX_Only:MXOnly-1U-Hotswap	SW48
1	SW_HOME	MX_Only:MXOnly-1U-Hotswap	SW82
1	SW_I	MX_Only:MXOnly-1U-Hotswap	SW36
1	SW_INSERT	MX_Only:MXOnly-1U-Hotswap	SW81
1	SW_J	MX_Only:MXOnly-1U-Hotswap	SW49
1	SW_K	MX_Only:MXOnly-1U-Hotswap	SW50
1	SW_L	MX_Only:MXOnly-1U-Hotswap	SW51
1	SW_LALT	MX_Only:MXOnly-1.25U-Hotswap	SW72

The 207 most common of 240 parts.

Questions

How big is the Model b PCB?

It measures 340 × 131 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Model b use?

240 parts, built around the RP2040, 0805L050WR and 1N4002W. 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 Model b KiCad files?

From the TrojanPinata/Model-B repository on GitHub, at the commit this page was made from: the board is pcb/model-b/model-b.kicad_pcb and its schematic case/top_plate/top_plate/top_plate.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Model b design in my own project?

Its repository states no licence, so its author keeps all rights: ask TrojanPinata before reusing the design.

Category and platform

LEDs and displays Keyboards and input RP2040

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/trojanpinata-model-b-model-b" title="Model b in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/trojanpinata-model-b-model-b.jpg" alt="Model b" width="1200" height="900">

A picture that opens the board, for a README

[![Model b](https://pcbkit.io/embed/boards/trojanpinata-model-b-model-b.jpg?size=s)](https://pcbkit.io/boards/trojanpinata-model-b-model-b)

Source

Repository: TrojanPinata/Model-B
Board file: pcb/model-b/model-b.kicad_pcb
Commit: abbf492
Homepage: brianchill.us/#/ModelB
Licence: Not stated

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