HardLabs

GRAM-SLIM

GRAMCTRL·GRAM-SLIM·GRAM Slim/3.1/GRAM-SLIM.kicad_pcb

GRAM-SLIM PCB layout, top view — open source RP2040/RP2350 board by GRAMCTRL
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About the GRAM-SLIM PCB

GRAM-SLIM is an open source RP2040/RP2350 PCB design by GRAMCTRL, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 288.8 × 160.1 mm, with 60 components from 23 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the XC6206, USBLC6-2SC6 and W25Q128JVS. By type, the board carries 17 capacitors, 11 resistors, 4 ICs, 3 diodes, 2 connectors and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Open source low-profile leverless design with an integrated RP2040.

If you would like to support the developer of this project, consider purchasing parts like buttons, PCBs, USB-C to GCC cables, and official GRAM builds at GRAMCTRL.COM rather than a fab house.

Included Files - Included in this repo is all the files needed to get started with a simple GRAM Slim build: - GRAM Slim Frame .stl files - Fab files for top and bottom panels - Template DXF for customizing top and bottom panels - GRAM 24mm keycap button .stl files

Main components on the GRAM-SLIM

XC6206USBLC6-2SC6RP2040W25Q128JVS

GRAM-SLIM bill of materials (BOM)

60 components, 23 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
XC6206
U1
1
USBLC6-2SC6
U2
1
RP2040
U3
1
W25Q128JVS
U4
1
12MHZ
12MHz
Y1
1
C456013
USB C Connector
J1
1
JTAG_TC2030
J2
21
choc_SW_HS
CH1, CH2, CH3, CH4, CH5, CH6, CH7, CH8 +13
1
C70076
500 mA
F1
2
C8598
Schottky Diode
D1, D2
1
C84256
GREEN
D3
4
1UF
1uF
C1, C2, C4, C10
10
100NF
100nF
C3, C5, C6, C11, C12, C13, C14, C15 +2
2
22PF
22pF
C7, C8
1
10UF
10uF
C9
1
1M
R1
2
5.1K
5.1k
R2, R3
1
470
R4
1
5.6K
5.6k
R5
1
10K
10k
R6
Show 3 more
QtyPartRefs
1
10K
10k
R7
2
27
R8, R9
2
1k
R10, R11

GRAM-SLIM design files

The KiCad project lives in the GRAMCTRL/GRAM-SLIM repository on GitHub; these links point at the commit this page was built from.

GRAM-SLIM: common questions

What microcontroller does the GRAM-SLIM use?

The GRAM-SLIM is built around the RP2040, from the RP2040/RP2350 family.

How big is the GRAM-SLIM PCB?

The GRAM-SLIM measures 288.8 × 160.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the GRAM-SLIM?

60 components, from 23 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 GRAM-SLIM design files?

From the GRAMCTRL/GRAM-SLIM 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 GRAM-SLIM design in my own project?

Yes, under the terms of its GPL-3.0 license, which GRAMCTRL chose for the repository.

Can I test firmware for the GRAM-SLIM 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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