2 layers63.8 × 52.7 mm
Projeto SIllion
Henriquepr15/ESP32-Motor-RS232
Projeto de hardware com ESP32, RS232 e controle de motor
59 parts
2 layers85.1 × 99.1 mm
Project f
Nodraak/SpeedOfLight2Reenactment of experiment(s) to measure the speed of light
- Size
- 85.1 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 9
- Pads
- 89
- Tracks, vias
- 93, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Nov 2025
- Updated
- 23 Feb 2026
Overview
Project f is an open-source printed circuit board by Nodraak, from the Nodraak/SpeedOfLight repository on GitHub. It is a 2-layer board of 85.1 × 99.1 mm with 15 parts on 9 nets, routed with 93 tracks and 0 vias.
It is built around the ESP32-WROOM-32 and LM2596S-ADJ. Its parts include 5 connectors and 2 ICs. It belongs with the ESP32 boards of this library.
Main components
2
ESP32-WROOM-32
SMD,18x25.5mm-40℃~+85℃ -98dBm 2.4GHz 2.7V~3.6V 20dBm Bluetooth4.2 ESP32-DOWDQ6 UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
LM2596S-ADJ
TO-263-5-40℃~+125℃@(TA) 1 1.2V~37V 150kHz 3A 40V 80uA Adjustable Buck Buck Built-in No TO-263-5 DC-DC Converters ROHSUMWDC-DC Converters
README
README.mdSpeed of light
Reenactment of experiment(s) to measure the speed of light.
Following a video by AlphaPhenix in 2018, where he redo Fizeau's experiement, I set out to reenact the experiement myself. After some research, it seems to me that Foucault's experiement is easier to perform and will give a more precise value, while using a somehow similar technique.
(Incomplete) history of speed of light measurements from Wikipedia:
| Scientist | Experiment | Year | Value measured (accuracy) |
|---|---|---|---|
| Rømer | Jupiter vs Io timing | 1676 | Earth's orbit's diameter / 22 min |
| Bradley | Aberration of light from a distant star | 1729 | Sun to the Earth distance / 8 min 12 sec |
| Fizeau | Time of flight with a toothed wheel | 1848 | 313 274 304 m/s (4.5%) |
| Foucault | Time of flight with a mirror | 1862 | 298 000 000 m/s (0.6%) |
| Cornu | Refinement of Fizeau's | 1872 | 300 400 000 m/s (0.2%) |
| Michelson | Refinement of Foucault's | 1879 | 299 944 000 m/s (0.05%) |
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | Conn_01x02 | Connector_Wire:SolderWirePad_1x02_P7.62mm_Drill2mm | J1_VCC1, J2_5V1, J3_ESC_POWER1 |
| 2 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4_ESC_CONTROL1, J5_SENSOR1 |
| 1 | ESP32-WROOM-32 | project-f:ESP32_DevkitC | U2 |
| 1 | LM2596S-ADJ | project-f:AZ-LM2596S | U1 |
The 7 most common of 15 parts.
Questions
How big is the Project f PCB?
It measures 85.1 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Project f use?
15 parts, built around the ESP32-WROOM-32 and LM2596S-ADJ. 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 Project f KiCad files?
From the Nodraak/SpeedOfLight repository on GitHub, at the commit this page was made from: the board is Foucault-experiment/electrical/project-f/project-f.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Project f design in my own project?
Its repository states no licence, so its author keeps all rights: ask Nodraak before reusing the design.
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