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Moisture Sensor

JakobThiessen·OpenThread_Sensors·Hardware/Moisture_Sensor/Moisture Sensor.kicad_pcb

Moisture Sensor PCB layout, top view — open source ESP32 board by JakobThiessen

About the Moisture Sensor PCB

Moisture Sensor is an open source ESP32 PCB design by JakobThiessen, published on GitHub under the MIT license. It is a 2-layer board measuring 135.4 × 28.5 mm, with 25 components from 18 distinct parts.

Its main chip is the ESP32-H2-SUPERMINI, from the ESP32 family. Other key parts include the NE555D. By type, the board carries 11 resistors, 6 capacitors, 2 ICs, 2 transistors, 2 connectors and 2 diodes.

It belongs with the sensors and iot & wireless designs in this gallery.

From the project

Fehler im Schlatplan!!! R7, Q1 und Q2 nicht bestücken. Verbindung von Q1/pin1 zu Q2/Pin2 wie eingezeichnet herstellen und mit GPIO ein und ausschalten.

Fehler im Schlatplan!!! R7, Q1 und Q2 nicht bestücken. Verbindung von Q1/pin1 zu Q2/Pin2 wie eingezeichnet herstellen und mit GPIO ein und ausschalten.

Batteriebetriebener kapazitiver Bodenfeuchtesensor für den Einsatz im Smart Home. Die Kommunikation erfolgt drahtlos über Matter over Thread mittels eines ESP32-H2 Supermini Moduls.

Das Sensordesign misst die Bodenfeuchte kapazitiv über eine interdigitale Elektrodenstruktur auf der PCB-Sonde und nutzt einen NE555 Timer zur Frequenzerzeugung. Die gemessene Frequenz wird vom ESP32-H2 ausgewertet und über das Thread-Netzwerk übermittelt.

Main components on the Moisture Sensor

ESP32-H2-SUPERMININE555D

Moisture Sensor bill of materials (BOM)

25 components, 18 distinct parts.

QtyPartRefs
1
ESP32-H2-SUPERMINI
U1
1
NE555D
U3
1
BSS123
Q1
1
BSS84
Q2
2
Conn_01x02_Pin
J1, J2
1
BAS19
D1
1
LED
D2
2
10nF
C1, C6
3
100nF
C2, C4, C5
1
470pF
C3
1
2M0
R1
1
330
R2
1
1k6
R3
3
10k
R4, R8, R11
2
1M
R5, R7
1
4M7
R6
1
100K
R9
1
0R0
R10

Moisture Sensor design files

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

Moisture Sensor: common questions

What microcontroller does the Moisture Sensor use?

The Moisture Sensor is built around the ESP32-H2-SUPERMINI, from the ESP32 family.

How big is the Moisture Sensor PCB?

The Moisture Sensor measures 135.4 × 28.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Moisture Sensor?

25 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Moisture Sensor design files?

From the JakobThiessen/OpenThread_Sensors repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Moisture Sensor design in my own project?

Yes, under the terms of its MIT license, which JakobThiessen chose for the repository.

Can I test firmware for the Moisture Sensor without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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