Kea CO2 ✨
You can now purchase these sensors through my website: https://www.keastudios.co.nz
A ESP32 based device to visualize co2 levels - Real-time graphs viewable through a web interface - External backup clock - Fail-safe file system to store data - Timezone support - Sync time through an unlocked Wi-Fi network Server (STA + AP Mode) - PCB Supports JTAG debugging (Through Breakout Connector)
Known limitations with current version
- fixed 1min data recording interval
- fixed 2mb max size data file (~60 days at 1min interval)
Getting Started
If you test this code on a device, it would be helpful to add any issues you find to this repository.
Prerequisites
The following libraries are used in Kea CO2:
- espressif32 Arduino Framework
- AsyncTCP-esphome @ 2.0.0 (LGPL (c) Hristo Gochkov @me-no-dev and others)
- ESPAsyncWebServer-esphome @ 3.0.0 (LGPL (c) Hristo Gochkov @me-no-dev and others)
- NeoPixelBus @ 2.7.3 (LGPL-3.0 license (c) Michael C. Miller and others)
- ArduinoJson @ 6.20.1 (The MIT License (c) Benoit BLANCHON)
- Apex Charts (JavaScript) (The MIT License)
Installation
1. Clone the repository.
2. Install the required libraries (platformio does this automatically).
3. Compile and upload the code to the ESP32 device.
Usage
The Kea CO2 device lights up a strip of WS2812B addressable RGB LEDs to display a scale of the ambient CO2 level. CO2 data is from a Sensirion SCD40, and the LEDs are adjusted depending on the ambient light.
The device can download a spreadsheet of CO2, temperature, and humidity data. The data is stored in a fixed 2 MB file, which can store up to 60 days of data at a fixed 1-minute recording interval.
Useful Extensions
- Better C++ Syntax
- Code Spell Checker
- Live Server
- Platformio IDE
- Putty for Standalone Serial Logger
Wiring
| Name | Designator | Footprint | Quantity | Manufacturer Part | Manufacturer |
|---|---|---|---|---|---|
| CR1220 | BT1 | CR1220 | 1 | BS-12-B2AA002 | MYOUNG(美阳) |
| 4.7uF | C1 | C0402 | 1 | CL05A475MP5NRNC | SAMSUNG(三星) |
| 10uF | C2-C18 | C0402 | 7 | CL05A106MQ5NUNC | SAMSUNG(三星) |
| 100nF | C3-58 | C0402 | 31 | CL05B104KO5NNNC | SAMSUNG(三星) |
| 100uF | C7 | CAP-SMD_L3.5-W2.8 | 1 | TAJB107K006RNJ | Kyocera AVX |
| 22uF | C10 | C0603 | 1 | CL10A226MQ8NRNC | SAMSUNG(三星) |
| 22pF | C21,C22,C23,C33 | C0402 | 4 | 0402CG220J500NT | FH(风华) |
| 47uF | C25,C27,C60 | C0805 | 3 | CL21A476MQYNNNE | SAMSUNG(三星) |
| 1nF | C31,C61 | C0402 | 2 | 0402B102K500NT | FH(风华) |
| 1N4148 | D2 | SOD-323_L1.8-W1.3-LS2.5-RD | 1 | 1N4148WS | CJ(江苏长电/长晶) |
| ZMM3V3 | D3 | LL-34_L3.5-W1.5-RD | 1 | ZMM3V3-M | ST(先科) |
| ZMM5V6 | D4 | LL-34_L3.5-W1.5-RD | 1 | ZMM5V6-M | ST(先科) |
| Ferrite Bead 800ma | FB1 | FB0805 | 1 | GZ2012D101TF | Sunlord(顺络) |
| XC6220B331MR-G | LDO1 | SOT-25-5_L3.0-W1.8-P0.95-LS3.0-BR | 1 | XC6220B331MR-G | TOREX(特瑞仕) |
| XC6206P332MR | LDO2 | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | 1 | XC6206P332MR | TOREX(特瑞仕) |
| WS2812B | LED1-32 | LED-SMD_XL-3535RGBC-WS2812B | 22 | XL-3535RGBC-WS2812B | XINGLIGHT(成兴光) |
| RTC | LED33 | LED0603-RD | 1 | KT-0603R | |
| 3V3_SCD4x | LED36 | LED0603-RD | 1 | 19-217/GHC-YR1S2/3T | EVERLIGHT(亿光) |
| 3V3 | LED103 | LED0603-RD | 1 | 19-217/GHC-YR1S2/3T | EVERLIGHT(亿光) |
| RX | LED104 | LED0603-RD | 1 | 19-213/Y2C-CQ2R2L/3T(CY) | EVERLIGHT(亿光) |
| TX | LED105 | LED0603-RD | 1 | 19-213/Y2C-CQ2R2L/3T(CY) | EVERLIGHT(亿光) |
| IO2 | LED106 | LED0603-RD | 1 | KT-0603R | |
| SN74LV1T34DBVR | LS1 | SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR | 1 | SN74LV1T34DBVR | TI(德州仪器) |
| 100kΩ | R1,R5,R14,R15 | R0402 | 4 | 0402WGF1003TCE | UNI-ROYAL(厚声) |
| 100Ω | R2,R4 | R0402 | 2 | 0402WGF1000TCE | UNI-ROYAL(厚声) |
| 10kΩ | R3,R6,R7,R8,R9,R25 | R0402 | 6 | 0402WGF1002TCE | UNI-ROYAL(厚声) |
| 200kΩ | R10,R16 | R0402 | 2 | 0402WGF2003TCE | UNI-ROYAL(厚声) |
| 200Ω | R11 | R0402 | 1 | 0402WGF2000TCE | UNI-ROYAL(厚声) |
| 1MΩ | R13 | R0402 | 1 | 0402WGF1004TCE | UNI-ROYAL(厚声) |
| 330Ω | R17 | R0402 | 1 | 0402WGF3300TCE | UNI-ROYAL(厚声) |
| 5.1kΩ | R18,R19 | R0402 | 2 | 0402WGF5101TCE | UNI-ROYAL(厚声) |
| 4.7kΩ | R29,R30 | R0402 | 2 | 0402WGF4701TCE | UNI-ROYAL(厚声) |
| RESET DATA | SW1 | KEY-SMD_4P-L4.2-W3.2-P2.20-LS4.6 | 1 | SKRPACE010 | ALPSALPINE(阿尔卑斯阿尔派) |
| LTR303 Lux | U4 | SOT-363_L2.0-W1.3-P0.65-LS2.1-BL | 1 | LTR-303ALS-01 | LITEON(光宝) |
| PCF8563T RTC | U6 | SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL | 1 | PCF8563T/5,518 | NXP(恩智浦) |
| 918-418K2024S40004 | USBC1 | USB-C-SMD_918-418K2023S40013-1 | 1 | 918-418K2024S40004 | 精拓金 |
| 32.768kHz | X1 | FC-135R_L3.2-W1.5 | 1 | Q13FC1350000400 | EPSON(爱普生) |
✌️ Other
Some of the foundational work was done as part of a project with Terrestrial Assemblages with the support of Govett-Brewster Art Gallery / Len Lye Centre
Thanks to everyone at @Espressif Systems for making a really awesome chip and porting it to arduino
Thanks to @LTRTNZ for putting up with my never ending shit and @vincentd123 for helping me
Made with love by Chris Dirks (@cd_fer) in Aotearoa New Zealand