2 layers
2 layers85 × 40 mm
Ctd base
Sailowtech-draft/Sailowtech-CTD2- Size
- 85 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 41
- Pads
- 70
- Tracks, vias
- 63, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 31 May 2024
- Updated
- 1 Nov 2025
Overview
Ctd base is an open-source printed circuit board by Sailowtech-draft, from the Sailowtech-draft/Sailowtech-CTD repository on GitHub. It is a 2-layer board of 85 × 40 mm with 10 parts on 41 nets, routed with 63 tracks and 0 vias.
Its parts include 8 connectors and 1 resistor.
README
README.mdSailowtech-CTD - Low-Tech CTD Probe
Welcome on the repository of the Sailowtech CTD Project, an affordable and open-source CTD probe tailored for scientific expeditions.
Why does this project exist?
After all, Open Source CTD probes already exist? Indeed, there are some great projects like Open CTD or CTDizzle, but we wanted something more tailored for mid to long term expeditions while allowing a modularity in the embedded sensors. Therefore, we aim to develop a project around a main electronic core and auxiliary cards that can be swapped depending on the research interest. For the moment, we propose a core based on a Raspberry PI Zero 2 W and an auxiliary cards for 2 Atlas Scientific Sensors (Conductivity, Temperature, Dissolved Oxygen, pH...).
Issues
If you encounter any issues, please use the Issue tracker on GitHub. Please note that this project is still in the development phase and currently undergoing testing.
Full documentation
The full documentation is accessible under https://sailowtech.github.io/Sailowtech-CTD/
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | Conn_01x04_Female | Connector_JST:JST_XH_S4B-XH-A-1_1x04_P2.50mm_Horizontal | J2, J3, J4, J5 |
| 2 | Conn_01x02_Male | Connector_JST:JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J1, J8 |
| 1 | 4.7kOhm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | R1 |
| 1 | Conn_01x03_Female | Connector_JST:JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J6 |
| 1 | Connector-ML:RPi_GPIO | Module:Raspberry_Pi_Zero_Socketed_THT_FaceDown_MountingHoles | J7 |
The 9 most common of 10 parts.
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Questions
How big is the Ctd base PCB?
It measures 85 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ctd base use?
10 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 Ctd base KiCad files?
From the Sailowtech-draft/Sailowtech-CTD repository on GitHub, at the commit this page was made from: the board is hardware/ctd-base/ctd-base.kicad_pcb and its schematic hardware/ctd-base-without-resistor-as-ordered/ctd-base.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ctd base design in my own project?
Its repository states no licence, so its author keeps all rights: ask Sailowtech-draft before reusing the design.