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GrainGuard — In-Silo Grain Condition Probe

jayis1·hardware-design-lab·grainguard/kicad/grainguard.kicad_pcb

GrainGuard — In-Silo Grain Condition Probe PCB layout, top view — open source STM32 board by jayis1

About the GrainGuard — In-Silo Grain Condition Probe PCB

GrainGuard — In-Silo Grain Condition Probe is an open source STM32 PCB design by jayis1, published on GitHub. It is a 4-layer board measuring 26.9 × 45.9 mm, with 21 components from 13 distinct parts.

Its main chip is the STM32WL55JCI6, from the STM32 family. Other key parts include the SCD41, SHT45, DS18B20, OPA2376 and ADL5511. By type, the board carries 17 ICs, 2 antennas and 1 crystal.

It belongs with the sensors and rf & radio designs in this gallery.

From the project

Full-cycle hardware device designs — each device in its own subfolder with architecture, schematics, PCB layout, and software stack

Author: jayis1 Copyright © 2026 jayis1. All rights reserved. License: CERN-OHL-S v2 (hardware), GPL-2.0 (firmware), MIT (app) Version: 1.0.0 Date: 2026-08-12

GrainGuard is a novel, open-hardware, multi-sensor probe sentinel for continuous in-silo stored-grain condition monitoring and early spoilage warning. It is a slender (38 mm diameter, 2.4 m long) sensor probe that is inserted vertically into a grain silo, grain bin, or flat-storage pile, where it simultaneously measures the four physical signatures that precede spoilage — CO₂ concentration, temperature profile (9 zones), relative…

Main components on the GrainGuard — In-Silo Grain Condition Probe

STM32WL55JCI6SCD41SHT45DS18B20OPA2376ADL5511TPS7A02W25R8024LC02

GrainGuard — In-Silo Grain Condition Probe bill of materials (BOM)

21 components, 13 distinct parts.

QtyPartRefs
1
STM32WL55JCI6
U1
1
SCD41
U2
1
SHT45
U3
9
DS18B20
U4, U5, U6, U7, U8, U9, U10, U11 +1
1
OPA2376
U14
1
ADL5511
U15
1
TPS7A02
U16
1
W25R80
U18
1
24LC02
U19
1
32.768kHz
Y1
1
7BB-20-6L0
AE1
1
868MHz_LoRa
ANT1
1
LSH-20
BAT1

GrainGuard — In-Silo Grain Condition Probe design files

The KiCad project lives in the jayis1/hardware-design-lab repository on GitHub; these links point at the commit this page was built from.

GrainGuard — In-Silo Grain Condition Probe: common questions

What microcontroller does the GrainGuard — In-Silo Grain Condition Probe use?

The GrainGuard — In-Silo Grain Condition Probe is built around the STM32WL55JCI6, from the STM32 family.

How big is the GrainGuard — In-Silo Grain Condition Probe PCB?

The GrainGuard — In-Silo Grain Condition Probe measures 26.9 × 45.9 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the GrainGuard — In-Silo Grain Condition Probe?

21 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the GrainGuard — In-Silo Grain Condition Probe design files?

From the jayis1/hardware-design-lab repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the GrainGuard — In-Silo Grain Condition Probe design in my own project?

The repository has no license, so all rights stay with jayis1. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the GrainGuard — In-Silo Grain Condition 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.

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