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Capacitive soil sensor panel

SolderedElectronics·Capacitive-soil-sensor-hardware-design·CAD/V2.0.0/PANEL/Capacitive soil sensor_panel.kicad_pcb

Capacitive soil sensor panel PCB layout, top view — open source board by SolderedElectronics
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About the Capacitive soil sensor panel PCB

Capacitive soil sensor panel is an open source PCB design by SolderedElectronics, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 6 × 109 mm, with 25 components from 17 distinct parts.

Other key parts include the TLC555 and SGM358YMS/TR. By type, the board carries 11 resistors, 6 capacitors, 2 ICs, 1 relay and 1 diode.

It belongs with the sensors designs in this gallery.

From the project

Hardware design, BOM, gerbers and 3D files for Capacitive-soil-sensor designed by Soldered Electronics.

How many times have you watered your plants and feared you overdid it? With the capacitive soil sensor, those worries are a thing of the past!

Most cheap soil sensors work on the resistance principle, where there are two prongs and the sensor measures the conductivity between them. They work fine at first, but eventually begin to oxidize due to the exposed metal. Even if they are gold plated! Due to oxidation, the resistance goes up and up, so you have to constantly recalibrate your code. Also, resistance measurements do not always work in loose soil.

Capacitive soil sensor panel, from the project README
From the project README

Main components on the Capacitive soil sensor panel

TLC555SGM358YMS/TR

Capacitive soil sensor panel bill of materials (BOM)

25 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TLC555
U1
1
SGM358YMS/TR
U2
2
HOLE_3.2mm
H1, H2
1
HEADER_MALE_3X1
K1
2
PAD_2x1.5
PAD1, PAD2
1
BAT20J
D1
1
1u
C1
1
10n
C2
3
100n
C3, C7, C8
1
470p
C4
1
1M
R1
3
10k
R2, R5, R9
1
330R
R3
1
1K6
R4
2
47k
R6, R11
2
100k
R7, R10
1
tc33x-2-103e
R8

Capacitive soil sensor panel design files

The KiCad project lives in the SolderedElectronics/Capacitive-soil-sensor-hardware-design repository on GitHub; these links point at the commit this page was built from.

Capacitive soil sensor panel: common questions

How big is the Capacitive soil sensor panel PCB?

The Capacitive soil sensor panel measures 6 × 109 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Capacitive soil sensor panel?

25 components, from 17 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 Capacitive soil sensor panel design files?

From the SolderedElectronics/Capacitive-soil-sensor-hardware-design repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Capacitive soil sensor panel design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which SolderedElectronics chose for the repository.

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