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USB Keypad

CDFER·Business-Cards·USB_Keypad/PCB/USB Keypad.kicad_pcb

USB Keypad PCB layout, top view — open source STM32 board by CDFER
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About the USB Keypad PCB

USB Keypad is an open source STM32 PCB design by CDFER, published on GitHub under the Custom license license. It is a 2-layer board measuring 93 × 27 mm, with 77 components from 32 distinct parts.

Its main chip is the MCU 72MHz STM32F103C8T6, from the STM32 family. Other key parts include the 8MHz 20pF ±10ppm. By type, the board carries 28 capacitors, 26 resistors, 9 switches, 7 LEDs, 2 ICs and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

Showcasing a collection of functional PCB business cards, each demonstrating a unique embedded electronics project.

The USB MicroPad is an 8-button macro pad for various applications, from productivity shortcuts to copy and paste macros. It's implemented as a USB HID keyboard and HID media consumer controller, ensuring compatibility with major operating systems without additional drivers.

8 programmable buttons USB-C connector 3.3V LDO regulator with low dropout voltage STM32F103C8T6 microcontroller with 72MHz CPU * Compatible with most operating systems as a USB HID device

USB Keypad, from the project README
From the project README

Main components on the USB Keypad

MCU 72MHz STM32F103C8T68MHz 20pF ±10ppm

USB Keypad bill of materials (BOM)

77 components, 32 distinct parts.

QtyPartRefs
1
MCU 72MHz STM32F103C8T6
U1
1
8MHz 20pF ±10ppm
U2
1
USB_C_Receptacle
J2
1
SRV05
ESD1
1
1.5A Resettable Fuse
F1
1
LDO 3.3V 200mA XC6206P332MR
LDO1
9
Button SPST 50mA 12V
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +1
4
0603,Red
LED1, LED2, LED6, LED7
3
0603,Yellow
LED3, LED4, LED5
1
0805,800mA
FB1
2
0402CG200J500NT
0402,20pF,50V,C0G
C1, C6
4
CL05B104KO5NNNC
100nF
C2, C4, C11, C16
1
CL21B105KBFNNNE
0805,1uF,50V,X7R
C3
9
CL05A105KA5NQNC
0402,1uF,25V,X5R
C5, C30, C31, C34, C35, C36, C37, C38 +1
1
CL05C331JB5NNNC
0402,330pF,50V,C0G
C7
2
CL05A475MP5NRNC
0402,4.7uF,10V,X5R
C8, C18
4
CL05C331JB5NNNC
330pF
C9, C10, C15, C17
2
CL10B474KA8NNNC
0603,470nF,25V,X7R
C12, C14
1
CL10C331JB8NNNC
0603,330pF,50V,C0G
C13
1
CL05B103KB5NNNC
10nF
C32
Show 12 more
QtyPartRefs
1
CL21B105KBFNNNE
1uF
C33
1
0402WGF1004TCE
0402,1M
R1
2
0402WGF220JTCE
0402,22
R2, R3
1
0402WGF4701TCE
0402,4.7k
R4
9
0402WGF1002TCE
0402,10k
R5, R6, R19, R20, R21, R24, R26, R27 +1
1
0402WGF1500TCE
0402,150
R7
2
0402WGF1003TCE
0402,100k
R8, R9
2
0402WGF1001TCE
0402,1k
R10, R11
2
0402WGF6800TCE
0402,680
R12, R17
2
0402WGF5101TCE
0402,5.1k
R13, R14
3
0402WGF1201TCE
0402,1.2k
R15, R16, R22
1
0402WGF3300TCE
0402,330
R18

USB Keypad design files

The KiCad project lives in the CDFER/Business-Cards repository on GitHub; these links point at the commit this page was built from.

USB Keypad: common questions

What microcontroller does the USB Keypad use?

The USB Keypad is built around the MCU 72MHz STM32F103C8T6, from the STM32 family.

How big is the USB Keypad PCB?

The USB Keypad measures 93 × 27 mm, has 2 copper layers and is 0.99 mm thick.

How many components are on the USB Keypad?

77 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the USB Keypad design files?

From the CDFER/Business-Cards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the USB Keypad design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the USB Keypad without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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