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    • The CO2 sensor bible MH-Z19B
    • Sensirion SCD30 dual-channel NDIR CO2 Sensor
    • Winsen Low Power NDIR CO2 Sensor MH-Z1311A
    • Comparison CO2 sensors MH-Z19B vs Senseair S8
    • Sensirion SCD41 and SCD40 CO2 Sensors
    • CO2 Sensors MH-Z19B FALSE
  • CO2 Easy
    • Build the home CO2 monitor with Wifi
    • Uses the Senseair S8 sensor in the CO2 Meter
    • Gallery: Users' CO2 Easy meters
    • 3D printed enclosures for CO2 meter
    • Add an OLED display to the meter
    • Adds temperature, humidity and atmospheric pressure
    • Are home CO₂ meters as reliable, accurate and precise as commercial ones?
    • Full colour touch screen for CO₂ meter Wow!
    • Adds buzzer alarms to the CO2 meter
    • The CO2 meter on a large display
    • CO2 on a giant screen for bars, restaurants, classrooms and the like.
  • CO2 Gadget
    • CO₂ Gadget – Open-source CO₂ sensor for ESP32
    • CO2 Meter TFT Colour Display with TTGO T-Display Sensirion SCD30 - The CO2 Gadget
    • CO2 Gadget Low Power CO2 monitor with Lilygo TTGO T5 ePaper and Sensirion SCD41 Sensor
    • CO2 Gadget Boxes, 3D Printed and without 3D printer
  • English (UK)
  • Español
eMariete
  • Home
  • Radioactivity Madrid
    • Ionising radiation in Madrid
    • Weather station
  • CO2 sensors
    • The CO2 sensor bible MH-Z19B
    • Sensirion SCD30 dual-channel NDIR CO2 Sensor
    • Winsen Low Power NDIR CO2 Sensor MH-Z1311A
    • Comparison CO2 sensors MH-Z19B vs Senseair S8
    • Sensirion SCD41 and SCD40 CO2 Sensors
    • CO2 Sensors MH-Z19B FALSE
  • CO2 Easy
    • Build the home CO2 monitor with Wifi
    • Uses the Senseair S8 sensor in the CO2 Meter
    • Gallery: Users' CO2 Easy meters
    • 3D printed enclosures for CO2 meter
    • Add an OLED display to the meter
    • Adds temperature, humidity and atmospheric pressure
    • Are home CO₂ meters as reliable, accurate and precise as commercial ones?
    • Full colour touch screen for CO₂ meter Wow!
    • Adds buzzer alarms to the CO2 meter
    • The CO2 meter on a large display
    • CO2 on a giant screen for bars, restaurants, classrooms and the like.
  • CO2 Gadget
    • CO₂ Gadget – Open-source CO₂ sensor for ESP32
    • CO2 Meter TFT Colour Display with TTGO T-Display Sensirion SCD30 - The CO2 Gadget
    • CO2 Gadget Low Power CO2 monitor with Lilygo TTGO T5 ePaper and Sensirion SCD41 Sensor
    • CO2 Gadget Boxes, 3D Printed and without 3D printer
  • English (UK)
  • Español

CO2 Gadget

Gadget CO₂ Calibration Guide: FRC, Pressure and Warm-Up

7 July 202622 June 2026 by Mariete

Gadget CO₂ Calibration Guide. Learn how to calibrate your high-quality CO₂ meter: FRC, custom calibration, atmospheric pressure compensation, warm-up and ASC.

Categories CO2 Gadget, CO2 Meter, CO2 sensors Tags CO2 Gadget, Sensors Leave a comment

CO2 Gadget Web Interface Guide: Dark Mode, Charts and Screenshots

9 July 202622 June 2026 by Mariete

All the pages of the CO2 Gadget web interface explained: Home, Charts with CSV/JSON export, FRC Calibration, Low Power, Preferences, Status and OTA.

Categories CO2 Gadget Tags CO2 Gadget, CO2 Gadget – Guides Leave a comment

Gadget’s BLE CO₂ Guide: MyAmbiance, BTHome and Real-Time Data

7 July 202622 June 2026 by Mariete

Gadget’s BLE CO₂ Guide. Connect your high-quality CO₂ monitor to the Sensirion MyAmbiance app: real-time data, downloadable history, Wi-Fi setup via Bluetooth and calibration.

Categories CO2 Gadget, CO2 Meter Tags CO2 Gadget, CO2 Gadget – Guides, ESP32 Leave a comment

Guide to Sensors Compatible with CO2 Gadget: CO2, PM and Environmental Sensors

7 July 202622 June 2026 by Mariete

Guide to sensors compatible with CO2 Gadget. All supported CO₂, PM and environmental sensors: SCD30, SCD40, SCD41, MH-Z19, CM1106, S8, SPS30 and more.

Categories CO2 Gadget, CO2 Meter, CO2 sensors Tags CO2 Gadget, CO2 Gadget – Guides, Sensors Leave a comment

CO2 Gadget MQTT Guide: Home Assistant, Alarms and Remote Commands

7 July 202622 June 2026 by Mariete

CO2 Gadget MQTT Guide. Integrate your high-quality CO₂ sensor with Home Assistant: publish CO₂, temperature, humidity, battery level and PM data; receive remote commands; set up alarms with hysteresis; and enable automatic discovery.

Categories CO2 Gadget, Home automation, CO2 Meter Tags CO2 Gadget, CO2 Gadget – Guides, Home Assistant, MQTT Leave a comment

CO2 Gadget WiFi Guide: Connection, Website and API

7 July 202622 June 2026 by Mariete

CO2 Gadget WiFi Guide. Learn how to connect your high-quality CO₂ monitor to the network: captive portal, MyAmbiance app, web interface, REST API, mDNS, static IP and troubleshooting. CO2 Gadget, the firmware that turns your ESP32 into a professional CO₂ monitor.

Categories CO2 Gadget, CO2 Meter Tags CO2 Gadget, CO2 Gadget – Guides, ESP32 Leave a comment

CO2 Gadget Low Power CO2 monitor with Lilygo TTGO T5 ePaper and Sensirion SCD41 Sensor

17 June, 202430 March, 2024 by Mariete
Control board for electronic projects and Arduino, easy to assemble and with high autonomy.

A low-power CO2 meter with a 90-day autonomy on a single charge? Not bad, not bad at all...

Categories CO2 Gadget, CO2 Meter, CO2 sensors Tags Low consumption, ESP32, Arduino Projects, Sensors 5 Comments

Gallery: Users' CO2 Gadgets

31 January, 2022 by Mariete

Some CO2 Gadgets made by users - submit yours!

Categories CO2 Gadget, CO2 Meter, Projects with Arduino Tags CO2 Gadget, 3D printing, Arduino Projects Leave a comment

CO2 Gadget Boxes, 3D Printed and without 3D printer

1 April, 202411 January, 2022 by Mariete

CO2 Gadget Boxes (with and without 3D printer) that you can print and modify.

Categories CO2 Gadget, CO2 Meter Tags CO2 Gadget, 3D printing Leave a comment

Cellular Polypropylene (PP) Boxes

23 December, 2021 by Mariete

Here's a great idea! Let's see how to easily make boxes for our projects in a homemade way, with cheap and easily available materials.

Categories CO2 Gadget Tags Arduino Projects Leave a comment
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