HardLabs

Big macro pad

obra·big-macro-pad

Big macro pad PCB layout, top view — open source GD32 board by obra

About the Big macro pad PCB

Big macro pad is an open source GD32 PCB design by obra, published on GitHub. It is a 2-layer board measuring 171.6 × 152.4 mm, with 175 components from 19 distinct parts.

Its main chip is the GD32F303CGT6, from the GD32 family. Other key parts include the MIC5504-3.3YM5-TR and SRV05-4HTG. By type, the board carries 73 switches, 72 diodes, 12 resistors, 10 capacitors, 3 ICs and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

A quick and dirty 8x9 macro pad using a GD32F303 MCU

Main components on the Big macro pad

GD32F303CGT6MIC5504-3.3YM5-TRSRV05-4HTG

Big macro pad bill of materials (BOM)

175 components, 19 distinct parts.

QtyPartRefs
1
GD32F303CGT6
GigaDevice
U1
1
MIC5504-3.3YM5-TR
Microchip
U2
1
SRV05-4HTG
Littelfuse
U3
1
NANOSMDC075F-2
PTC RESET FUSE 6V 750MA
Littelfuse Inc.
F1
2
V5.5MLA0603NH
Littelfuse
RV1, RV2
1
TS-1145-C-B
SW_PUSH
E-Switch
SW1
72
SW_Push_45deg
SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10 +64
1
HRO_TYPE-C-31-M-12
USB - C USB 3.1 (USB 3.1 Gen 2, Superspeed+) Receptacle Connector 24 Position Surface Mount, Right Angle
HRO
USB1
72
1N4148
D2, D3, D4, D5, D6, D7, D8, D9 +64
1
BLM31PG391SN1L
FERRITE 390 OHM
Murata
L1
5
CL10A105MP8NNNC
1µF ±20% 10V Ceramic Capacitor X5R 0603 (1608 Metric)
Samsung
C1, C2, C3, C4, C5
2
CL10A105MP8NNNC
1uF
Samsung
C6, C7
2
C1210C475K4RACTU
4.7uF 16V X7R
Kemet
C8, C9
1
GCJ216R72A103KA01D
10nF 100V
Murata
C10
6
RC0603JR-0710KL
10K
Yaego
R2, R3, R4, R5, R6, R7
2
RC0603FR-0722RL
22R
Yaego
R8, R9
1
1.5k
R10
2
RC0603FR-075K1L
5.1K 1%
Yaego
R11, R12
1
ERJ-3EKF4993V
500K
Panasonic
R13

Big macro pad design files

The KiCad project lives in the obra/big-macro-pad repository on GitHub; these links point at the commit this page was built from.

Big macro pad: common questions

What microcontroller does the Big macro pad use?

The Big macro pad is built around the GD32F303CGT6, from the GD32 family.

How big is the Big macro pad PCB?

The Big macro pad measures 171.6 × 152.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Big macro pad?

175 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the Big macro pad design files?

From the obra/big-macro-pad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Big macro pad design in my own project?

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

Can I test firmware for the Big macro pad without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug GD32 firmware against it before you order a PCB.

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