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Kvm base

thatoddmailbox·kvm-base

Kvm base PCB layout, top view — open source STM32 board by thatoddmailbox
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About the Kvm base PCB

Kvm base is an open source STM32 PCB design by thatoddmailbox, published on GitHub under the Custom license license. It is a 4-layer board measuring 84 × 90.8 mm, with 65 components from 20 distinct parts.

Its main chip is the STM8S003F3P, from the STM32 family. Other key parts include the AMS1117-3.3, FSUSB74, TMDS361B and SL2.1A. By type, the board carries 29 capacitors, 16 connectors, 12 resistors, 6 ICs, 1 crystal and 1 switch.

From the project

The main board for the open-source HDMI KVM switch I built.

The main board for the open-source HDMI KVM switch I built. Contains HDMI and USB switch ICs, allowing you to share two monitors and four USB devices between three different computers.

This is a 1.6mm four layer PCB, designed for JLCPCB's JLC7628 impedance-controlled stackup. It most likely will not work (or will be limited in terms of HDMI performance) on another stackup.

Kvm base, from the project README
From the project README

Main components on the Kvm base

AMS1117-3.3FSUSB74STM8S003F3PTMDS361BSL2.1A

Kvm base bill of materials (BOM)

65 components, 20 distinct parts.

QtyPartRefs
1
AMS1117-3.3
U1
1
FSUSB74
U2
1
STM8S003F3P
U3
2
TMDS361B
U4, U5
1
SL2.1A
U6
1
12MHz
Y1
4
USB_B_Mini
J1, J2, J3, J4
1
Keypad
J5
1
Debug
J6
8
HDMI_A
J7, J8, J9, J10, J11, J12, J13, J14
2
USB_Dual_A
J15, J16
1
Reset
SW1
8
10uF
C1, C2, C24, C25, C26, C27, C28, C29
10
0.1uF
C3, C5, C8, C9, C12, C13, C16, C17 +2
1
0.47uF
C4
8
1uF
C6, C7, C10, C11, C14, C15, C18, C19
2
12pF
C22, C23
6
10k
R1, R3, R5, R6, R7, R8
2
4.02k
R2, R4
4
5.9k
R9, R10, R11, R12

Kvm base design files

The KiCad project lives in the thatoddmailbox/kvm-base repository on GitHub; these links point at the commit this page was built from.

Kvm base: common questions

What microcontroller does the Kvm base use?

The Kvm base is built around the STM8S003F3P, from the STM32 family.

How big is the Kvm base PCB?

The Kvm base measures 84 × 90.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Kvm base?

65 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Kvm base design files?

From the thatoddmailbox/kvm-base repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Kvm base 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 Kvm base 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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