HardLabs

Leakwatch

lewipewi·leakwatch·pcb/leak_sensor_v2.kicad_pcb

Leakwatch PCB layout, top view — open source RP2040/RP2350 board by lewipewi

About the Leakwatch PCB

Leakwatch is an open source RP2040/RP2350 PCB design by lewipewi, published on GitHub. It is a 4-layer board measuring 77 × 67 mm, with 90 components from 43 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the DMG3415U-7, 74LVC1G14, TLV3011AIDBVT, CD4051B and OPA2333xxD. By type, the board carries 32 capacitors, 27 resistors, 12 ICs, 7 connectors, 2 crystals and 2 diodes.

It belongs with the sensors and robotics & motion designs in this gallery, and the repository also holds 1 earlier revision of it.

From the project

A multi-channel leak sensor for equipment enclosures. Instead of reporting "wet / dry" like a normal leak probe, it measures how wet each enclosure is, on a separate channel per enclosure, and carries a second circuit that raises an alarm in hardware with no firmware involved.

A multi-channel leak sensor for equipment enclosures. Instead of reporting "wet / dry" like a normal leak probe, it measures how wet each enclosure is, on a separate channel per enclosure, and carries a second circuit that raises an alarm in hardware with no firmware involved.

Designed with the Blue Robotics BlueROV2 in mind — a Navigator flight controller, I²C, and JST-GH connectors. The circuit itself is generic and would suit any multi-enclosure system.

Leakwatch, from the project README
From the project README

Main components on the Leakwatch

DMG3415U-774LVC1G14TLV3011AIDBVTCD4051BOPA2333xxDTMUX1104DGSRAP2112K-3.3RP2040W25Q128JVSIQSHT45MB85RC64PCF8563T

Leakwatch bill of materials (BOM)

90 components, 43 distinct parts.

QtyPartRefs
1
DMG3415U-7
U1
1
74LVC1G14
U2
1
TLV3011AIDBVT
U3
1
CD4051B
U4
1
OPA2333xxD
U5
1
TMUX1104DGSR
U6
1
AP2112K-3.3
U7
1
RP2040
U8
1
W25Q128JVSIQ
U9
1
SHT45
U10
1
MB85RC64
U11
1
PCF8563T
U12
1
12MHz
Y1
1
32.768 kHz
Y2
5
Conn_01x02_Pin
J1, J2, J3, J4, J5
1
Conn_01x03_Pin
J6
1
Conn_01x04_Pin
J7
6
PESD5V0S1BA
CR1, CR2, CR3, CR4, CR5, CR6
1
SW_Omron_B3FS
SW1
2
BAT54W
D1, D2
Show 23 more
QtyPartRefs
1
600R @ 100MHz
FB1
1
4.7nF
C1
16
100nF
C2, C5, C7, C9, C10, C16, C18, C22 +8
6
1uF
C3, C11, C14, C15, C17, C19
1
100nF
C4
2
10uF
C6, C13
1
2.2pF
C8
1
1nF
C12
3
15pF
C20, C21, C31
1
0.1F
C25
2
47k
R1, R7
8
100
R2, R3, R8, R9, R10, R11, R12, R18
1
3.3k
R4
2
1M
R5, R13
1
2.2M
R6
2
1k
R14, R19
1
3M
R15
2
100k
R16, R22
1
3k
R17
3
10k
R20, R21, R29
1
1k
R24
1
10k
R25
2
4.7k
R27, R28

Leakwatch design files

The KiCad project lives in the lewipewi/leakwatch repository on GitHub; these links point at the commit this page was built from.

Leakwatch: common questions

What microcontroller does the Leakwatch use?

The Leakwatch is built around the RP2040, from the RP2040/RP2350 family.

How big is the Leakwatch PCB?

The Leakwatch measures 77 × 67 mm, has 4 copper layers and is 1.6062 mm thick.

How many components are on the Leakwatch?

90 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Leakwatch design files?

From the lewipewi/leakwatch repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Leakwatch design in my own project?

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

Can I test firmware for the Leakwatch without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

Earlier revisions in the repo: leak_sensor_v1

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