knewter/kvm-board2An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
Kehvm is an open-source printed circuit board by knewter, from the knewter/kvm-board repository on GitHub. It is a 4-layer board of 120 × 92 mm with 70 parts on 64 nets.
It is built around the TC358743XBG, USB2514B/M2 and AMS1117-1.2, with the AMS1117-1.8, AMS1117-2.5 and AMS1117-3.3 among its other parts. It belongs with the ESP32 boards of this library.
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
Target HDMI ──► TC358743 ──► Milk-V Duo S (KVMD) ──► Browser
Target USB ◄── USB Hub ◄── ESP32-S3 (HID) ◄── Duo S (UART)
Target ATX ◄── Optocouplers ◄── Duo S GPIOThe ESP32-S3 handles USB HID emulation, the Duo S runs the KVM daemon (web server, video streaming, HID dispatch), and a custom carrier PCB ties everything together.
No hardware needed — simulate the full KVM pipeline against a QEMU virtual machine:
# Install dependencies
pip install aiohttp asyncvnc pillow
# Run full simulation (boots Alpine Linux in QEMU)
mise run kvmd:vm
# Open http://localhost:8080 in your browserDesigned in KiCad 10 as a 6-layer carrier PCB (120x92mm):
| Component | Part | Purpose |
|---|---|---|
| Main SBC | Milk-V Duo S (SG2000) | KVMD daemon, video capture, networking |
| HID Controller | ESP32-S3 | USB keyboard/mouse emulation |
| HDMI Capture | TC358743XBG | HDMI 1.4 → MIPI CSI-2 bridge |
| USB Hub | USB2514B | Combines HID + mass storage into single cable |
| ATX Control | 4x PC817 | Optocoupler-isolated power/reset control |
Estimated BOM cost: ~$62/unit (qty 5), ~$40-45 (qty 50+)
# Open KiCad project
mise run kicad hardware/kvm-carrier.kicad_prosoftware/kvmd/) — Python asyncio daemon with aiohttp web serverfirmware/esp32-hid/) — ESP-IDF + TinyUSB USB HID composite devicesoftware/sim/protocol.py) — Shared UART protocol (Python + C)cd software/sim && python -m pytest -v # Protocol tests
cd software/kvmd && python -m pytest -v # KVMD testsTBD
| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100n | C_0402_1005Metric | hdmi.C16, hdmi.C17, hdmi.C18, hdmi.C19, hdmi.C20, hdmi.C21, hdmi.C22, hdmi.C24, pwr.C4, pwr.C7, pwr.C10, pwr.C13, usb.C23, usb.C25, usb.C31, usb.C32 +1 |
| 8 | 10u | C_0805_2012Metric | pwr.C2, pwr.C3, pwr.C5, pwr.C6, pwr.C8, pwr.C9, pwr.C11, pwr.C12 |
| 4 | 10k | R_0402_1005Metric | atx.R12, atx.R13, hdmi.R6, usb.R9 |
| 4 | PC817 | SOP-4_4.4x2.6mm_P1.27mm | atx.U7, atx.U8, atx.U9, atx.U10 |
| 2 | 10n | C_0402_1005Metric | usb.C41, usb.C42 |
| 2 | 10p | C_0402_1005Metric | hdmi.C26, hdmi.C27 |
| 2 | 20p | C_0402_1005Metric | usb.C38, usb.C39 |
| 2 | 330 | R_0402_1005Metric | atx.R10, atx.R11 |
| 2 | 4.7k | R_0402_1005Metric | hdmi.R4, hdmi.R5 |
| 2 | 5.1k | R_0402_1005Metric | pwr.R1, pwr.R2 |
| 2 | 600R | L_0603_1608Metric | hdmi.FB1, hdmi.FB2 |
| 1 | 12k | R_0402_1005Metric | usb.R8 |
| 1 | 1k | R_0402_1005Metric | pwr.R3 |
| 1 | 24MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | usb.X2 |
| 1 | 27MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | hdmi.X1 |
| 1 | 2k | R_0402_1005Metric | hdmi.R7 |
| 1 | 47u | C_1206_3216Metric | pwr.C1 |
| 1 | AMS1117-1.2 | SOT-223-3_TabPin2 | pwr.U3 |
| 1 | AMS1117-1.8 | SOT-223-3_TabPin2 | pwr.U2 |
| 1 | AMS1117-2.5 | SOT-223-3_TabPin2 | pwr.U4 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | pwr.U1 |
| 1 | ATX_FP | PinHeader_2x05_P2.54mm_Vertical | atx.J5 |
| 1 | CSI_FPC_15 | Hirose_FH12-15S-0.5SH_1x15-1MP_P0.50mm_Horizontal | conn.J10 |
| 1 | ESP32-S3-Header1 | PinHeader_2x20_P2.54mm_Vertical | esp32.J3 |
| 1 | ESP32-S3-Header2 | PinHeader_2x20_P2.54mm_Vertical | esp32.J4 |
| 1 | HDMI_A | HDMI_A_Amphenol_10029449-x01xLF_Horizontal | conn.J6 |
| 1 | MilkV-DuoS-Header1 | PinHeader_2x13_P2.54mm_Vertical | duos.J1 |
| 1 | MilkV-DuoS-Header2 | PinHeader_2x13_P2.54mm_Vertical | duos.J2 |
| 1 | PWR | LED_0805_2012Metric | pwr.D1 |
| 1 | RJ45 | RJ45_Amphenol_RJHSE538X | conn.J9 |
| 1 | TC358743XBG | csBGA-64_5x5mm_Layout8x8_P0.5mm | hdmi.U5 |
| 1 | USB2514B | QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm | usb.U6 |
| 1 | USB_A | USB_A_Molex_67643_Horizontal | conn.J7 |
| 1 | USB_C | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | conn.J8 |
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
knewter/kvm-board
An open-source KVM-over-IP device built with a Milk-V Duo S (RISC-V) and ESP32-S3. Remotely control any computer's keyboard, video, and mouse over your network — at the hardware level, independent of the target's OS.
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MetalMusings/MyOwnEtherCATDevice
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It measures 120 × 92 mm and has 4 copper layers, 1.6 mm thick.
70 parts, built around the TC358743XBG, USB2514B/M2, AMS1117-1.2 and AMS1117-1.8. 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.
From the knewter/kvm-board repository on GitHub, at the commit this page was made from: the board is hardware/kehvm.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask knewter before reusing the design.