2 layers19.5 × 31.5 mm SGP41 OLEDsm, the printed circuit board in 3D

SGP41 OLEDsm

Air Temperature Humidity NOx VOC Pressure sensor PCB

Size: 19.5 × 31.5 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 24
Nets: 22
Pads: 80
Tracks, vias: 200, 16
Pours: 1
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 24 Nov 2024
Updated: 19 Dec 2024

Overview

SGP41 OLEDsm is an open-source printed circuit board by RonHeg, from the RonHeg/SGP41_OLED_SuperMini repository on GitHub, published under the MIT licence. It is a 2-layer board of 19.5 × 31.5 mm with 24 parts on 22 nets, routed with 200 tracks and 16 vias.

It is built around the ICP-10111, SGP41-D-R4 and SHT40-AD1B-R2, with the UM6K34NTCN among its other parts. Its parts include 9 resistors, 7 capacitors, 4 ICs, 3 connectors and 1 transistor. It belongs with the sensors and measurement boards of this library.

Main components

README

README.md

The Evs-2 SGP41 OLED SuperMini is a small PCB from RJ Hegler Technologies, LLC containing Temperature, Humidity, Pressure, VOC and NOx sensors designed to connect to the ESP32C3 SuperMini microcontroller. The PCB is also configurable to easily attach to a XIAO microcontroller or, with jumper wires, you could attach it to other processors.

The sensors are: Sensirion AG SHT-40-AD1B Temperature and Humidity. Sensirion AG SGP41-D-R4 NOx and VOC. TDK ICP-10111 Barometric pressure and temperature. The PCB uses its hosts 3.3v supply (~11mA with the pre-loaded software) and communicates via I2C.

EVs-2_SGP41_VOC.ino sends data thru the serial port at a baud rate of 115,200 and also displays 4 lines on a OLED display (if you are using a different display, please verify pinout, some OLED displays have Vcc and GND reversed). The OLED display reads:

text

SGP41 VOC Sensor
78.23F, RH 48.00%
NOx = 1, VOC = 94
28.97inHg

(Numbers in the data are an example, your readings should be the actual for your conditions)

Example of data sent through the serial port is:

SHT40

T: 26.32 RH: 28.41

Tticks: 26704 RHticks: 18016

SGP41

compensationRh: 18016 compensationT: 26704

raw VOC Index: 28689 raw NOx Index: 0

VOC Index: 0 NOx Index: 0

ICP-10111

Temperature: 27.38C

99919.05Pa 29.51inHg

Altitude: 132.09m

Parts

Qty	Value	Footprint	References
5	1uF	Capacitor_SMD:C_0603_1608Metric	C2, C3, C4, C5, C7
4	0	Resistor_SMD:R_0603_1608Metric	R6, R7, R8, R9
4	10k	Resistor_SMD:R_0603_1608Metric	R2, R3, R4, R5
2	0.1uF	Capacitor_SMD:C_0603_1608Metric	C1, C6
2	Conn_01x08	Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical	J1, J2
1	4.7	Resistor_SMD:R_0603_1608Metric	R1
1	AP7313-18SAG-7	Package_TO_SOT_SMD:SOT-23	U2
1	ICP-10111	ICP_10111:PSON65P250X200X100-8N	U5
1	OLED Display	Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical	J3
1	SGP41-D-R4	RJHTEC:XCDR_SGP40-D-R4[1]	U3
1	SHT40-AD1B	Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad	U1
1	UM6K34N	Package_TO_SOT_SMD:SOT-363_SC-70-6	Q1

Questions

How big is the SGP41 OLEDsm PCB?

It measures 19.5 × 31.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SGP41 OLEDsm use?

24 parts, built around the ICP-10111, SGP41-D-R4, SHT40-AD1B-R2 and UM6K34NTCN. 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 SGP41 OLEDsm KiCad files?

From the RonHeg/SGP41_OLED_SuperMini repository on GitHub, at the commit this page was made from: the board is SGP41_OLEDsm.kicad_pcb and its schematic SGP41_OLEDsm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the SGP41 OLEDsm design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Sensors and measurement

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/ronheg-sgp41-oled-supermini" title="SGP41 OLEDsm in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/ronheg-sgp41-oled-supermini.jpg" alt="SGP41 OLEDsm" width="1200" height="900">

A picture that opens the board, for a README

[![SGP41 OLEDsm](https://pcbkit.io/embed/boards/ronheg-sgp41-oled-supermini.jpg?size=s)](https://pcbkit.io/boards/ronheg-sgp41-oled-supermini)

Source

Repository: RonHeg/SGP41_OLED_SuperMini
Board file: SGP41_OLEDsm.kicad_pcb
Commit: f8b2a8c
Licence: MIT

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