2 layers142.7 × 194.5 mm SparkFun STC31 panelized, the printed circuit board in 3D

SparkFun STC31 panelized

A Qwiic breakout for the STC31 CO2 and SHTC3 Temperature and Humidity Sensors.

Size: 142.7 × 194.5 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 2,002
Nets: 16
Pads: 2,491
Tracks, vias: 5,635, 1,435
Pours: 35
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 1 May 2025
Updated: 3 Jun 2026

Overview

SparkFun STC31 panelized is an open-source printed circuit board by sparkfun, from the sparkfun/SparkFun_CO2_Sensor-STC31 repository on GitHub. It is a 2-layer board of 142.7 × 194.5 mm with 2,002 parts on 16 nets, routed with 5,635 tracks and 1,435 vias.

It is built around the SHTC3 and STC31. Its parts include 210 resistors, 105 connectors, 70 capacitors, 70 ICs and 35 diodes. It belongs with the sensors and measurement boards of this library.

Main components

README

Hardware/README.md

SparkFun Design Files

The .sch and .brd files hare are Eagle CAD schematic and PCB design files from SparkFun Electronics. A freeware version of Autodesk Eagle can be found here.

Category and platform

Sensors and measurement

Topics

sparkfun-tutorial environmental qwiic sensor

Project files

Show this board on your page

https://pcbkit.io/boards/sparkfun/SparkFun_CO2_Sensor-STC31

The board's own page, for a message or a post.

Source

Repository: sparkfun/SparkFun_CO2_Sensor-STC31
Board file: Production/SparkFun_STC31_panelized.kicad_pcb
Commit: 8bda1b1
Homepage: docs.sparkfun.com/SparkFun_CO2_Sensor-STC31
Licence: Not stated

Parts

2,002

Qty	Value	Footprint	References
140	Fiducial_0.5mm	SparkFun-Aesthetic:Fiducial_0.5mm_Mask1mm	FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1, FID1 +124
140	Standoff	SparkFun-Hardware:Standoff	ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1, ST1 +124
70	0.1uF	SparkFun-Capacitor:C_0603_1608Metric	C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1 +54
70	2.2k	SparkFun-Resistor:R_0603_1608Metric	R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2, R2 +54
70	G***	kibuzzard-6813D00F	kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F, kibuzzard-6813D00F +54
70	G***	kibuzzard-68489B7D	kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D, kibuzzard-68489B7D +54
70	G***	kibuzzard-68489B76	kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76, kibuzzard-68489B76 +54
70	G***	kibuzzard-682CCD34	kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34, kibuzzard-682CCD34 +54
70	G***	kibuzzard-682CCCFC	kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC, kibuzzard-682CCCFC +54
70	LOGO	SparkFun-Aesthetic:qwiic_5mm	G*, G, G, G, G, G, G, G, G, G, G, G, G, G, G, G* +54
70	LOGO	SparkFun-Aesthetic:SparkFun_Logo_NoFlame_9mm	G*, G, G, G, G, G, G, G, G, G, G, G, G, G, G, G* +54
70	Qwiic_RA	SparkFun-Connector:JST_SMD_1.0mm-4_Black	J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3, J3 +54
35	0x2A	SparkFun-Jumper:Jumper_2_NO	JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3, JP3 +19
35	0x2B	SparkFun-Jumper:Jumper_2_NO	JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4, JP4 +19
35	0x2C	SparkFun-Jumper:Jumper_2_NO	JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5, JP5 +19
35	10k	SparkFun-Resistor:R_0603_1608Metric	R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5, R5 +19
35	1k	SparkFun-Resistor:R_0603_1608Metric	R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4, R4 +19
35	3.3k	SparkFun-Resistor:R_0603_1608Metric	R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1, R1 +19
35	4.7k	SparkFun-Resistor:R_0603_1608Metric	R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9, R9 +19
35	G***	kibuzzard-67BF7D12	kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12, kibuzzard-67BF7D12 +19
35	G***	kibuzzard-67BF7EBF	kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF, kibuzzard-67BF7EBF +19
35	G***	kibuzzard-67D9D97F	kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F, kibuzzard-67D9D97F +19
35	G***	kibuzzard-67BF7F2F	kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F, kibuzzard-67BF7F2F +19
35	G***	kibuzzard-6813D116	kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116, kibuzzard-6813D116 +19
35	G***	kibuzzard-6813D11F	kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F, kibuzzard-6813D11F +19
35	G***	kibuzzard-6813D10D	kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D, kibuzzard-6813D10D +19
35	G***	kibuzzard-6813D1B2	kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2, kibuzzard-6813D1B2 +19
35	G***	kibuzzard-681398D9	kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9, kibuzzard-681398D9 +19
35	G***	kibuzzard-681398E8	kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8, kibuzzard-681398E8 +19
35	G***	kibuzzard-67BF7C99	kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99, kibuzzard-67BF7C99 +19
35	G***	kibuzzard-67BF7F13	kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13, kibuzzard-67BF7F13 +19
35	G***	kibuzzard-67BF7CFE	kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE, kibuzzard-67BF7CFE +19
35	G***	kibuzzard-65A8A8B4	kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4, kibuzzard-65A8A8B4 +19
35	G***	kibuzzard-67D9E7C1	kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1, kibuzzard-67D9E7C1 +19
35	I2C	SparkFun-Connector:1x04	J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4, J4 +19
35	I2C	SparkFun-Jumper:Jumper_3_NC-2_Trace	JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2, JP2 +19
35	LED	SparkFun-Jumper:Jumper_2_NC_Trace	JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1, JP1 +19
35	Red	SparkFun-LED:LED_0603_1608Metric_Red	D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1, D1 +19
35	SHTC3	SparkFun-Sensor:SHTC3	U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4, U4 +19
35	STC31	SparkFun-Sensor:STC31	U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, U3 +19
35	Val**	SparkFun-Aesthetic:OSHW_Logo_2.5mm	Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref, Ref +19
4		Fiducial_1mm_Mask3mm	, , ,
2		Fiducial_1.5mm_Mask3mm	,
1	OSHW_Logo	SparkFun-Aesthetic:Creative_Commons_License	G4

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Questions

How big is the SparkFun STC31 panelized PCB?

It measures 142.7 × 194.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SparkFun STC31 panelized use?

2,002 parts, built around the SHTC3 and STC31. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the SparkFun STC31 panelized KiCad files?

From the sparkfun/SparkFun_CO2_Sensor-STC31 repository on GitHub, at the commit this page was made from: the board is Production/SparkFun_STC31_panelized.kicad_pcb and its schematic Hardware/SparkFun_STC31.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the SparkFun STC31 panelized design in my own project?

Its repository states no licence, so its author keeps all rights: ask sparkfun before reusing the design.