6 layers81.5 × 50 mm
Picard
weiiwang01/picard
PiCard is a miniaturized Raspberry Pi Compute Module carrier board optimized for Linux server use cases.
166 parts8
4 layers13.6 × 19.4 mm
MiniCO2
nup002/miniCO240A miniature USB CO2 sensor
- Size
- 13.6 × 19.4 mm
- Copper layers
- 4
- Thickness
- 1 mm
- Parts
- 25
- Nets
- 36
- Pads
- 172
- Tracks, vias
- 97, 43
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Jul 2024
- Updated
- 1 Apr 2025
Overview
MiniCO2 is an open-source printed circuit board by nup002, from the nup002/miniCO2 repository on GitHub. It is a 4-layer board of 13.6 × 19.4 mm with 25 parts on 36 nets, routed with 97 tracks and 43 vias.
It is built around the ESP32-C6-MINI-1U-H4, SCD40-D-R2 and SIT1552AI-JE-DCC-32.768D, with the ESD9B3.3ST5G, BSMD0402L-075 and ESD9B5.0ST5G among its other parts. Its parts include 8 capacitors, 4 resistors, 4 ICs, 4 diodes and 2 switches. It belongs with the sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
7
ESP32-C6-MINI-1U-H4
SMD,13.2x12.5mm-105.5dBm -40℃~+105℃ 2.4GHz 20.5dBm 382mA 3V~3.6V 73mA ESP32-C6FH4 Integrated Bluetooth function、Integrated Zigbee function、Support USB interface UART、SDIO、SPI、I2C、GPIO、USB SMD,13.2x12.5mm WiFi Modules ROHSEspressif SystemsWiFi Modules
SCD40-D-R2
LGA-20(10.1x10.1)-10℃~+60℃ 10.1mm 10.1mm 15mA 2.4V~5.5V 400ppm~2000ppm 6.5mm Air quality I2C Reset function ±5% LGA-20(10.1x10.1) Gas Sensors ROHSSensirionGas Sensors
SIT1552AI-JE-DCC-32.768D
SMD1508-4P-40℃~+85℃ 1.52uA 1.5V~3.63V 32.768kHz LVCMOS ±5ppm SMD1508-4P Programmable Oscillators ROHSSiTimeProgrammable Oscillators
ESD9B3.3ST5G
SOD-923(0402)ESD And Surge Protection (TVS/ESD)TECH PUBLIC
BSMD0402L-075
0402-40℃~+85℃ 0.65mm 0.6mm 1.15mm 1.5A 100ms 300mΩ 30mΩ 40A 500mW 6V 750mA 0402 Resettable Fuses ROHSBHFUSEResettable FusesESD9B5.0ST5G
SOD-923(0402)-55℃~+125℃ 1 10V 15pF 5V 8.4V 80W@8/20us 80nA 8A@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOD-923(0402) ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
WS2812C-4020
SMD-4P,4x2mm-20℃~+70℃ 0.5mA 1.7mm 2kHz 2mm 3.98mm 4.5V~5.5V 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function G:400mcd~600mcd、R:150mcd~200mcd、B:100mcd~150mcd G:525nm~530nm、R:625nm~630nm、B:470nm~475nm SMD-4P,4x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
README
readme.mdMiniCO2
The MiniCO2 is a miniature USB-powered CO2 sensor that can be used anywhere you need a simple indicator of CO2. Its built-in LEDs light up green, orange, or red, depending on the amount of CO2 in the air. The default levels can be adjusted via software to suit your needs.
The image above is of a prototype. The final version will have a USB-C connector and wireless connectivity.
I want one!
The MiniCO2 is under development and cannot be purchased yet. But you can register your interest by adding your email to the bottom of this form: https://docs.google.com/forms/d/e/1FAIpQLSczLEsP1Wsz9qHPjULFHvHtzbTa30NaE-r1zrS9D4k2iNyR5Q/viewform?usp=sf_link
Once finished, the MiniCO2 will be available for purchase on Tindie.
Repo status
The repository is an active work in progress. Currently, only the KiCAD design files are provided. I intend to add:
- CAD files for a 3D-printable enclosure
- Firmware
- Control application
- Python example snippets on how to receive data
Compatibility
The MiniCO2 will work with any standard USB type C port that can supply power. That means it can be plugged in nearly anywhere: Laptops, displays, chargers, battery banks, etc. It will also have wireless connectivity thanks to an ESP32-C6 module. This provides Wi-Fi, Bluetooth, Bluetooth Low Power, Thread, and Zigbee.
Licenses
The MiniCO2 firmware is licensed under the GNU General Public License v3. The MiniCO2 hardware is licensed under CERN-OHL-S v2. This includes the PCB design files and enclosure design files. As an individual you are free to make your own MiniCO2, or to modify it, as long as these licenses are respected.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 5.1k | Resistor_SMD:R_0201_0603Metric | R1, R4, R6, R7 |
| 3 | 2.2uF | Capacitor_SMD:C_0201_0603Metric | C1, C2, C3 |
| 3 | 22uF | Capacitor_SMD:C_0402_1005Metric | C5, C6, C8 |
| 2 | ESD9B3.3ST5G | Diode_SMD:D_SOD-923 | D2, D3 |
| 2 | SW_Push | miniCO2:LS75C2D-T | SW1, SW2 |
| 1 | 0.47uH | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 100nF | Capacitor_SMD:C_0201_0603Metric | C7 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | BSMD0402L-075 | Capacitor_SMD:C_0402_1005Metric | F1 |
| 1 | ESD9B5.0ST5G | Diode_SMD:D_SOD-923 | D4 |
| 1 | ESP32-C6-MINI-1/U | PCM_Espressif:ESP32-C6-MINI-1 | U1 |
| 1 | LM3281 | Package_BGA:Texas_DSBGA-6_0.95x1.488mm_Layout2x3_P0.4mm | U2 |
| 1 | SCD40-D-R2 | miniCO2:Sensirion_SCD4x-1EP_10.1x10.1mm_P1.25mm_EP4.8x4.8mm | U3 |
| 1 | SIT1552AI-JE-DCC-32.768D | miniCO2:SiT1552CSP_0.84x1.54 | U4 |
| 1 | USB_C_Plug_USB2.0 | miniCO2:U261-121N-4BS2S | P1 |
| 1 | WS2812C-4020 | miniCO2:WS2812C-4020 | D1 |
Questions
How big is the MiniCO2 PCB?
It measures 13.6 × 19.4 mm and has 4 copper layers, 1 mm thick.
What parts does the MiniCO2 use?
25 parts, built around the ESP32-C6-MINI-1U-H4, SCD40-D-R2, SIT1552AI-JE-DCC-32.768D and ESD9B3.3ST5G. 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 MiniCO2 KiCad files?
From the nup002/miniCO2 repository on GitHub, at the commit this page was made from: the board is hardware/pcb/miniCO2/ESP32/miniCO2.kicad_pcb and its schematic hardware/pcb/miniCO2/ESP32/miniCO2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MiniCO2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask nup002 before reusing the design.
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