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Moisture sensor

gratinDeTopinambour·Moisture-sensor·Electronics/Moisture_sensorV2/KICAD/moisture_sensor.kicad_pcb

Moisture sensor PCB layout, top view — open source STM32 board by gratinDeTopinambour

About the Moisture sensor PCB

Moisture sensor is an open source STM32 PCB design by gratinDeTopinambour, published on GitHub. It is a 2-layer board measuring 24 × 100 mm, with 22 components from 15 distinct parts.

Its main chip is the STM32U073C8Tx, from the STM32 family. Other key parts include the LCD_3_DIGIT. By type, the board carries 12 capacitors, 3 switches, 2 ICs, 2 connectors, 2 resistors and 1 diode.

It belongs with the displays & leds, sensors and power & battery designs in this gallery.

From the project

A low-power capacitive soil moisture sensor with an LCD display for indoor plant monitoring.

A complete open-source capacitive soil moisture sensor project based on the STM32U073CB microcontroller.

This repository contains all resources for the project: 📐 3D Design: Modular enclosure for 3D printing. 🔌 Electronics (V1 & V2): KiCad files, Gerbers, BOM, PDF schematics, and 3D models. 💻 Firmware: C/C++ source code optimized for STM32 (STM32CubeIDE / STM32CubeMX project). 📖 Documentation: User manual and component datasheets.

Moisture sensor, from the project README
From the project README

Main components on the Moisture sensor

STM32U073C8TxLCD_3_DIGIT

Moisture sensor bill of materials (BOM)

22 components, 15 distinct parts.

QtyPartRefs
1
STM32U073C8Tx
U1
1
LCD_3_DIGIT
U4
1
CR2032_holder_smd
J1
1
ST-link
J3
1
NRST
SW1
1
SwA
SW2
1
SwB
SW3
1
RED_LED
D1
1
10uF
C1
7
100nF
C5, C6, C8, C9, C11, C12, C13
2
1uF
C7, C10
1
Cprobe
C15
1
47nF
C16
1
1k
R2
1
200
R3

Moisture sensor design files

The KiCad project lives in the gratinDeTopinambour/Moisture-sensor 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 STM32U073C8Tx, from the STM32 family.

How big is the Moisture sensor PCB?

The Moisture sensor measures 24 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Moisture sensor?

22 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Moisture sensor design files?

From the gratinDeTopinambour/Moisture-sensor 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?

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

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 STM32 firmware against it before you order a PCB.

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