4 layers55 × 72 mm
DB9 Differential Signal Selector
nanographs/Open-Beam-Interface
Just what you need to control the beam and get an image.
18 parts371
4 layers50.5 × 61.2 mm
ZeitMessung
BuildersInc/EthernetLatencyTestplatform1Used to measure the time difference within the Ethernet communication between two uC's
- Size
- 50.5 × 61.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 42
- Pads
- 84
- Tracks, vias
- 122, 120
- Pours
- 64
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 May 2025
- Updated
- 23 Oct 2025
Overview
ZeitMessung is an open-source printed circuit board by BuildersInc, from the BuildersInc/EthernetLatencyTestplatform repository on GitHub, published under the MIT licence. It is a 4-layer board of 50.5 × 61.2 mm with 18 parts on 42 nets, routed with 122 tracks and 120 vias.
Its parts include 6 resistors, 3 capacitors, 3 connectors, 2 ICs and 1 diode.
README
readme.mdEthernet Latency Testplatform
Used to measure the time difference within the Ethernet communication between two uC's
Created for my Bachelor Thesis
External Components
ESP 32 Pinout
| GPIO | Function |
|---|---|
| 00 | RETCLK |
| 12 | Output detection |
| 13 | Input detection |
| 14 | Master & Slave |
| 17 | NC |
| 18 | MDC |
| 19 | TX 0 |
| 21 | TX Enable |
| 22 | TX 1 |
| 23 | MDIO |
| 25 | RX 0 |
| 26 | RX 1 |
| 27 | CRS |
Necessary Modifications
- Remove ClockGen from LAN8720 Board and use ESP32 as source
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 4k7 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R5, R6 |
| 3 | 100 nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | Input | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | M&S Jmp | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | Switch | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | TST GND | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3 |
| 1 | TST Sig In | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | TST Sig Out | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J1 |
| 1 | ~ | Library:ESP32-WROOM | U2 |
| 1 | ~ | Library:LAN8720 DevBoard | U1 |
Questions
How big is the ZeitMessung PCB?
It measures 50.5 × 61.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ZeitMessung use?
18 parts. 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.
Where can I download the ZeitMessung KiCad files?
From the BuildersInc/EthernetLatencyTestplatform repository on GitHub, at the commit this page was made from: the board is Hardware/ZeitMessung.kicad_pcb and its schematic Hardware/ZeitMessung.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ZeitMessung design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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