HardLabs

Modulus

advaitconty·Modulus·PCB/Modulus Keyboard/Modulus.kicad_pcb

Modulus PCB layout, top view — open source RP2040/RP2350 board by advaitconty

About the Modulus PCB

Modulus is an open source RP2040/RP2350 PCB design by advaitconty, published on GitHub. It is a 2-layer board measuring 295.6 × 183 mm, with 230 components from 37 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C97521 and C26537. By type, the board carries 59 diodes, 29 switches, 25 capacitors, 24 fuses, 15 resistors and 7 connectors.

It belongs with the keyboards designs in this gallery.

From the project

A keyboard, designed to be completely modular via USB Type-C ports

A keyboard, built with the idea of expansion in the future, through SPI.

Things I will do later in the future (with other Hack Club events, or with my own money): - Numpad over SPI - Macropad over SPI

Just use it like a keyboard! However, any SPI accessories should be connected while the keyboard is powered down. This is mainly a limitation of SPI, as it is not hot-plug compatible. The USB ports are USB 2.0 only, so it's better to be used for stuff like USB sound cards and mice. I don't actually know how much lag will the ports create, because they're bottom mounted, in direct contact with…

Modulus, from the project README
From the project README

Main components on the Modulus

C2040C97521C26537

Modulus bill of materials (BOM)

230 components, 37 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C2040
RP2040
U1
1
C97521
W25Q128JVS
U3
1
C26537
NCP1117-3.3_SOT223
U4
1
C41430893
Keyswitch
Q1
2
C9002
12MHz
Y1, Y2
2
C368521
XLR3
J1, J5
1
C165948
USB_C_Receptacle_USB2.0_16P
J2
2
C6307429
USB_A
J3, J4
1
OLED_128X32
OLED_128x32
J6
1
C41430893
Keyswitch
P1
15
Keyswitch
0)1, 1!1, 2@1, 3#1, 4$1, 5%1, 6^1, 7&1 +7
13
Diode
0)D1, 1!D1, 2@D1, 3#D1, 4$D1, 5%D1, 6^D1, 7&D1 +5
24
C41430893
Keyswitch
Backspace1, Backspace2, Command1, Command2, Control1, Del1, Del2, Down1 +16
5
C81598
Diode
BackspaceD1, BackspaceD2, DelD1, DelD2, EscD1
12
C41430893
Keyswitch
F1, F2, F3, F4, F5, F6, F7, F8 +4
12
Diode
F1D1, F2D1, F3D1, F4D1, F5D1, F6D1, F7D1, F8D1 +4
1
GL850G
GL850G1
1
Keyswitch
S45
23
C41430893
Keyswitch
S46, S47, S48, S49, S50, S51, S52, S53 +15
3
Keyswitch
S58, S59, S60
Show 17 more
QtyPartRefs
1
Keyswitch
S72
1
C2888566
Push_Button
SW1
6
Keyswitch
Space1, Space2, Space3, Space4, Tab1, \|1
1
C41430893
Keyswitch
T1
58
C81598
Diode
D31, D32, D33, D34, D35, D36, D37, D38 +50
1
C2290
LED
D91
2
C1848
1uF
C1, C10
11
C24497
0.1uF
C2, C3, C4, C5, C6, C7, C8, C9 +3
2
C13585
10uF
C13, C14
4
C107115
33pF
C15, C16, C20, C21
6
C1848
100nF
C22, C23, C24, C25, C26, C27
1
C17798
680
R1
2
C17594
27
R3, R4
3
C4410
1K
R5, R6, R14
5
C17902
10K
R7, R12, R15, R16, R17
3
C27834
5.1K
R8, R9, R13
1
C25922
88.7K
R11

Modulus design files

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

Modulus: common questions

What microcontroller does the Modulus use?

The Modulus is built around the C2040, from the RP2040/RP2350 family.

How big is the Modulus PCB?

The Modulus measures 295.6 × 183 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Modulus?

230 components, from 37 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 Modulus design files?

From the advaitconty/Modulus 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 Modulus design in my own project?

The repository has no license, so all rights stay with advaitconty. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Modulus 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.

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