2 layers123.9 × 111.9 mm
Modulus Macropad
advaitconty/Modulus
A keyboard, designed to be completely modular via USB Type-C ports
52 parts
2 layers295.6 × 183 mm
Modulus
advaitconty/ModulusA keyboard, designed to be completely modular via USB Type-C ports
- Size
- 295.6 × 183 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 231
- Nets
- 166
- Pads
- 1,035
- Tracks, vias
- 1,668, 292
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Oct 2025
- Updated
- 28 Mar 2026
Overview
Modulus is an open-source printed circuit board by advaitconty, from the advaitconty/Modulus repository on GitHub. It is a 2-layer board of 295.6 × 183 mm with 231 parts on 166 nets, routed with 1,668 tracks and 292 vias.
It is built around the RP2040, W25Q128JVSIQ and GL850G. Its parts include 25 capacitors, 15 resistors, 6 connectors, 5 switches and 3 ICs. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
3
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
GL850G
SSOP-28SSOP-28-208mil USB Converters ROHSGenesys LogicUSB Converters
README
readme.mdModulus
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 foam, and is air cooled. So it may overheat (tried to add thermal dissiptation vias but effectiveness not tested)
Quirks:
- Case has holes at the bottom for cooling (yes I'm serious)
Images
-
model + board
-
board only
Parts
231| Qty | Value | Footprint | References |
|---|---|---|---|
| 88 | Diode | Diode_SMD:D_SMA | -_D1, =+D1, 0)D1, 1!D1, 2@D1, 3#D1, 4$D1, 5%D1, 6^D1, 7&D1, 8*D1, 9(D1, BackspaceD1, BackspaceD2, D31, D32 +72 |
| 77 | Keyswitch | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_1.00u | -_1, =+1, 0)1, 1!1, 2@1, 3#1, 4$1, 5%1, 6^1, 7&1, 8*1, 9(1, Backspace1, Backspace2, Command1, Command2 +61 |
| 11 | 0.1uF | Capacitor_SMD:C_1206_3216Metric | C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C17 |
| 7 | Keyswitch | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_1.50u | \|1, S72, Space1, Space2, Space3, Space4, Tab1 |
| 6 | 100nF | Capacitor_SMD:C_1206_3216Metric | C22, C23, C24, C25, C26, C27 |
| 5 | 10K | Resistor_SMD:R_1206_3216Metric | R7, R12, R15, R16, R17 |
| 4 | 33pF | Capacitor_SMD:C_0805_2012Metric | C15, C16, C20, C21 |
| 3 | 1K | Resistor_SMD:R_1206_3216Metric | R5, R6, R14 |
| 3 | 5.1K | Resistor_SMD:R_0805_2012Metric | R8, R9, R13 |
| 3 | Keyswitch | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_1.25u | S58, S59, S60 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric | C13, C14 |
| 2 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1, Y2 |
| 2 | 1uF | Capacitor_SMD:C_1206_3216Metric | C1, C10 |
| 2 | 27 | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | USB_A | USB1046-GF-0190-L-B-A_REVB4:GCT_USB1046-GF-0190-L-B-A_REVB4 | J3, J4 |
| 2 | XLR3 | NC3FAAH:NEUTRIK_NC3FAAH | J1, J5 |
| 1 | 680 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 88.7K | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | GL850G | GL850G:28SSOP | GL850G1 |
| 1 | Keyswitch | PCM_Switch_Keyboard_Hotswap_Kailh:SW_Hotswap_Kailh_MX_1.75u | S45 |
| 1 | LED | LED_THT:LED_D5.0mm | D91 |
| 1 | LOGO | Special Footprints:Hack Club | G*** |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | OLED_128x32 | ScottoKeebs_Components:OLED_128x32 | J6 |
| 1 | Push_Button | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | RP2040 | Package_DFN_QFN:QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | ScottoKeebs_Components:USB_C_HRO_TYPE-C-31-M-12 | J2 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U3 |
Questions
How big is the Modulus PCB?
It measures 295.6 × 183 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Modulus use?
231 parts, built around the RP2040, W25Q128JVSIQ and GL850G. 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 Modulus KiCad files?
From the advaitconty/Modulus repository on GitHub, at the commit this page was made from: the board is PCB/Modulus Keyboard/Modulus.kicad_pcb and its schematic PCB/Modulus Keyboard/Modulus.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Modulus design in my own project?
Its repository states no licence, so its author keeps all rights: ask advaitconty before reusing the design.
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