HardLabs

Salinity Probe

Carciax·EEE4022S_Salinity_JCP24-03·PCBs/Probe/Probe.kicad_pcb

Salinity Probe PCB layout, top view — open source STM32 board by Carciax

About the Salinity Probe PCB

Salinity Probe is an open source STM32 PCB design by Carciax, published on GitHub. It is a 4-layer board measuring 50 × 50 mm, with 79 components from 45 distinct parts.

Its main chip is the C1339473, from the STM32 family. Other key parts include the C2861165, C128399, C8963, C7433 and C2758003. By type, the board carries 22 capacitors, 22 resistors, 11 ICs, 11 test points, 8 connectors and 3 transistors.

From the project

This project focused on the design of a salinity sensor for measuring the salinity of the sea water beneath the Antarctica ice caps which had a unique habitat and salinity range due to the ice caps expelling large amount of salt through brine channels into the ocean below. The pr

This project focused on the design of a salinity sensor for measuring the salinity of the sea water beneath the Antarctica ice caps which had a unique habitat and salinity range due to the ice caps expelling large amount of salt through brine channels into the ocean below. The project consisted of two PCB boards, a probe to be inserted through a drilled hole in the ice and a controller to calibrate, request and display measurements. The probe used a complex switching array to measure the average resistance between a pair of either gold or titanium electrodes using a voltage sweep, then it…

Salinity Probe, from the project README
From the project README

Main components on the Salinity Probe

C2861165C1339473C128399C8963C7433C2758003C20415992

Salinity Probe bill of materials (BOM)

79 components, 45 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C2861165
DAC53401
U1
1
C1339473
STM32F401RCTx
U2
4
C128399
4xSwitch
U3, U6, U8, U11
1
C8963
SP3485EN
U4
2
C7433
OP07C
U5, U10
1
C2758003
TempSensor
U7
1
C20415992
DepthSensor
U9
1
C2146
S8050_SMD
Q1
2
C15127
PMOS
Q2, Q3
1
Au+
J1
1
Ti+
J3
1
Au-
J4
1
Ti-1
J6
2
Ti-2
J7, J11
1
Debug
J8
1
RS485
J9
1
SCL
TP5
1
SDA
TP6
1
RS485_UART
TP7
1
RS485_DE
TP8
Show 25 more
QtyPartRefs
1
3V3
TP9
1
UBDAC
TP10
1
DAC
TP11
1
AMP
TP12
1
SIG
TP13
1
CALIB
TP14
1
GND
TP15
1
C2297
GREEN
D1
1
C2286
RED
D2
2
C23630
2.2u
C1, C3
10
C14663
100n
C2, C7, C8, C10, C11, C12, C13, C14 +2
2
C19702
10u
C4, C22
1
C15849
1u
C5
2
C69182
4.7u
C6, C9
5
C15195
10n
C17, C18, C19, C20, C21
2
C25804
10k
R1, R8
2
C23162
4.7k
R2, R3
4
C22950
20
R4, R5, R6, R7
3
C23025
300
R9, R12, R16
3
C4211
3k
R10, R13, R17
3
C22984
30k
R11, R14, R18
1
C22787
120
R15
1
C4410
1k
R19
1
C17902
10k
R20
2
C21190
1k
R21, R22

Salinity Probe design files

The KiCad project lives in the Carciax/EEE4022S_Salinity_JCP24-03 repository on GitHub; these links point at the commit this page was built from.

Salinity Probe: common questions

What microcontroller does the Salinity Probe use?

The Salinity Probe is built around the C1339473, from the STM32 family.

How big is the Salinity Probe PCB?

The Salinity Probe measures 50 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Salinity Probe?

79 components, from 45 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Salinity Probe design files?

From the Carciax/EEE4022S_Salinity_JCP24-03 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Salinity Probe design in my own project?

The repository has no license, so all rights stay with Carciax. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Salinity Probe 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.

More boards in EEE4022S_Salinity_JCP24-03

Similar boards