2 layers90 × 50 mm
2 layers70 × 70 mm
Co2monitor
co2monnz/co2monitor-pcbCO2 Monitor PCB
- Size
- 70 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 53
- Pads
- 198
- Tracks, vias
- 266, 59
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 May 2023
- Updated
- 13 Jun 2023
Overview
Co2monitor is an open-source printed circuit board by co2monnz, from the co2monnz/co2monitor-pcb repository on GitHub. It is a 2-layer board of 70 × 70 mm with 40 parts on 53 nets, routed with 266 tracks and 59 vias.
It is built around the 74AHCT1G125SE, ESP32-S3-WROOM-1-N8 and BME680, with the SHT30-DIS, AP2112K-3.3 and WS2812B among its other parts. Its parts include 10 capacitors, 6 resistors, 6 ICs, 5 diodes and 5 connectors. It belongs with the sensors and measurement boards and the ESP32 boards of this library.
Main components
7
74AHCT1G125SE
SOT-353-40℃~+125℃ 1 1 4.5V~5.5V 4.7ns@5V,50pF 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSDiodes IncorporatedBuffers, Drivers, Receivers, Transceivers
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
BME680
LGA-8-40℃~+85℃ 0.12hpa 0.6hpa 1.3pa/K 1.71V~3.6V 150nA 30Kpa~1.1bar I2C、SPI Temperature Sensor LGA-8 Pressure Sensors ROHSBosch SensortecPressure Sensors
SHT30-DIS
DFN-8DFN-8 Temperature and Humidity Sensor ROHSSensirionUncategorised
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
MBR0520
SOD-123-55℃~+150℃ 20V 450mV@500mA 5.5A 500mA Independent SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
README
README.mdco2mon.nz Ventilation Monitor
Inspired by https://github.com/oseiler2/CO2Monitor
Description
This is a prototype CO2 based ventilation monitor intended for fixed (wall-mounted) use in standard residential, office and retail type spaces. It uses the well regards Sensirion SCD40 CO2 sensor as well as a Bosch BME680 for VOC and barometric pressure measurement and a Sensirion SHT30 for temperature and humidity.
WiFi connectivity is provided by the main ESP32-S3 processor allowing measurements to be reported back to the https://co2mon.nz/ web service if desired.
An accompanying 3D printable case design can be found in the https://github.com/co2monnz/cad repository.
License, Copyright and Reuse
© 2023 MKMBA Ltd.
The design files (e.g. schematics, pcb layout and associated data) in this repository are available under the terms of the CC-BY-NC license detailed in the accompanying LICENSE file.
There doesn't seem to be any perfect way of licensing hadware designs that I've found yet, so if the CC-BY-NC terms are not suitable for you please get in touch and I'll generally be fairly wiling to consider other options including for commercial re-use, etc.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nF | Capacitor_SMD:C_0805_2012Metric | C3, C5, C7, C8, C9, C10 |
| 4 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4 |
| 3 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D3, D4, D5 |
| 2 | 10μF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 4k7 | Resistor_SMD:R_0805_2012Metric | R5, R6 |
| 2 | 5k1 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 1μF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 22μF | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 5V | Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_Vertical | J4 |
| 1 | 74AHCT1G125 | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | BME680 | Package_LGA:Bosch_LGA-8_3x3mm_P0.8mm_ClockwisePinNumbering | U3 |
| 1 | BOOT | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW2 |
| 1 | ESP32-S3-WROOM-1 | Espressif:ESP32-S3-WROOM-1 | U2 |
| 1 | I2C | Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical | J3 |
| 1 | JTAG | Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical | J5 |
| 1 | MBR0520 | Diode_SMD:D_SOD-123 | D1 |
| 1 | PWR | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | RESET | Local:SW_Push_1P1T_NO_CK_KMR2 | SW1 |
| 1 | SCD40 | scd:SCD40-D-R1 | U4 |
| 1 | SHT30-DIS | Local:SHT30_DFN-8-1EP_2.5x2.5mm_P0.5mm_EP1.1x1.7mm | U6 |
| 1 | SSD1306 | SSD1306-2:OLED_128x64_0.96_small | OLED1 |
| 1 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | UART | Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_Vertical | J2 |
| 1 | USB_C_Receptacle_USB2.0 | Local:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J1 |
Questions
How big is the Co2monitor PCB?
It measures 70 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Co2monitor use?
40 parts, built around the 74AHCT1G125SE, ESP32-S3-WROOM-1-N8, BME680 and SHT30-DIS. 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 Co2monitor KiCad files?
From the co2monnz/co2monitor-pcb repository on GitHub, at the commit this page was made from: the board is co2monitor.kicad_pcb and its schematic co2monitor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Co2monitor design in my own project?
Its repository states no licence, so its author keeps all rights: ask co2monnz before reusing the design.
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