HardLabs

Spool sentry

rwrife·spool-sentry·hardware/spool-sentry.kicad_pcb

Spool sentry PCB layout, top view — open source ESP32 board by rwrife

About the Spool sentry PCB

Spool sentry is an open source ESP32 PCB design by rwrife, published on GitHub under the MIT license. It is a 2-layer board measuring 66 × 75 mm, with 32 components from 21 distinct parts.

Its main chip is the 113991054, from the ESP32 family. Other key parts include the NAU7802SGI and SHT40-N-NF. By type, the board carries 11 capacitors, 10 resistors, 3 ICs, 3 connectors, 3 diodes and 1 fuse.

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

From the project

USB-powered ESP32-C3 monitor for 3D-printing hobbyists to track dry-box humidity, temperature, and filament spool mass through a private local dashboard without controlling heaters or printers.

This directory now carries the schematic source-of-truth for the Spool Sentry carrier board.

- spool-sentry.kicadpro / spool-sentry.kicadsch: KiCad 9 project + schematic - sym-lib-table, fp-lib-table: local library bindings used by this schematic - lib/spool-sentry.kicadsym: project-local custom symbols (XIAO ESP32-C3 module, NAU7802 ADC) - lib/spool-sentry.pretty/XIAOESP32C3.kicadmod: project-local XIAO module footprint - lib/spool-sentry.dcm`: symbol documentation metadata

Main components on the Spool sentry

113991054NAU7802SGISHT40-N-NF

Spool sentry bill of materials (BOM)

32 components, 21 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
113991054
Seeed XIAO ESP32-C3
Seeed Technology Co., Ltd.
U1
1
NAU7802SGI
SOIC-16_3.9x9.9mm_P1.27mm
Nuvoton Technology Corporation
U2
1
SHT40-N-NF
Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad
Sensirion AG
U3
1
USB4105-GF-A
USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal
Global Connector Technology
J1
1
SM04B-GHS-TB(LF)(SN)
JST_GH_SM04B-GHS-TB_1x04-1MP_P1.25mm_Horizontal
JST
J2
1
TSW-104-07-G-S
PinHeader_1x04_P2.54mm_Vertical
Samtec
J3
1
MF-MSMF050-2
Fuse_1812_4532Metric
Bourns
F1
1
PTS810SJM250SMTRLFS
SW_SPST_PTS810
C&K (Littelfuse)
SW1
1
SMF5.0A
D_SOD-123F
Littelfuse
D1
1
B140-13-F
D_SMA
Diodes Incorporated
D2
1
ASMT-YTC7-0AA02
LED_Avago_PLCC6_3x2.8mm
Broadcom Limited
D3
1
GRM31CR61A475KA01L
C_1206_3216Metric
Murata
C1
5
GRM188R71H104KA93D
C_0603_1608Metric
Murata
C2, C4, C7, C8, C10
1
GRM31CR61A106KA01L
C_1206_3216Metric
Murata
C3
3
GRM188R71C105KA12D
C_0603_1608Metric
Murata
C5, C6, C11
1
GRM1885C1H331JA01D
C_0603_1608Metric
Murata
C9
2
RC0603FR-075K1L
R_0603_1608Metric
Yageo
R1, R2
2
RC0603FR-0747RL
R_0603_1608Metric
Yageo
R3, R4
2
RC0603FR-074K7L
R_0603_1608Metric
Yageo
R5, R6
1
RC0603FR-0710KL
R_0603_1608Metric
Yageo
R7
Show 1 more
QtyPartRefs
3
RC0603FR-07220RL
R_0603_1608Metric
Yageo
R8, R9, R10

Spool sentry design files

The KiCad project lives in the rwrife/spool-sentry repository on GitHub; these links point at the commit this page was built from.

Spool sentry: common questions

What microcontroller does the Spool sentry use?

The Spool sentry is built around the 113991054, from the ESP32 family.

How big is the Spool sentry PCB?

The Spool sentry measures 66 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Spool sentry?

32 components, from 21 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 Spool sentry design files?

From the rwrife/spool-sentry repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Spool sentry design in my own project?

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

Can I test firmware for the Spool sentry 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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