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DIY-Kit CO₂-Guard
48,85EUR* 35,70EUR*
inkl. MwSt.
zzgl. Versandkosten
Item is in stock.  

Kit to replicate the CO2-Guard. The complete assembly instruction can be found at www.co2-guard.de/ (english: https://www.elektormagazine.de/labs/co2-guard). Ideal for school, kindergarten, workplace or office for fighting against COVID-19.

The CO₂-Guard is a DIY project for indoor air monitoring and assessment of air quality based on the carbon dioxide concentration (IAR: Indoor air quality). The device uses an NDIR sensor and displays the air quality via LEDs in several stages. In addition, an alarm sounds if the load is unacceptably high. It is possible to transfer the measured values ​​(CO2 value and temperature) to an IoT server via WLAN and evaluate them graphically there.


  • 1 x Wemos Lolin D1 Mini ESP8266 (compatible) with NodeMCU incl. Pin headers
  • 1 x Winsen MH-Z19C CO2 sensor (0-5000 ppm)
  • 1 x FC-07 / YL-44 active sound module
  • 1 x Miniature fan 5 V
  • 1 x Built-in button, incl. 5V blue lighting
  • 1 x LED, 20 mA, 5 mm, red, incl. resistor 3-5 V, pre-wired
  • 1 x LED, 20 mA, 5 mm, yellow, incl. resistor 3-5 V, pre-wired
  • 1 x LED, 20 mA, 5 mm, green, incl. resistor 3-5 V, pre-wired
  • 3 x LED holder 5 mm
  • 1 x Housing with ventilation slots
  • 1 x Perforated board approx. 70 mm x 90 mm
  • approx. 100 cm insulated strand
  • Colored sticker to design the front panel

Not supplied and to be obtained separately by you (or mostly already available):

  • 1 x USB power supply, 5 V, at least 250 mA or power bank
  • 1 x USB cable: connector type A to connector type B-Micro.

Note: Symbol pictures. Completely assembled device is not part of the delivery

DIY-Kit CO₂-Guard
DIY-Kit CO₂-Guard
DIY-Kit CO₂-Guard
Select picture to enlarge, please.
DIY-Kit CO₂-Guard
For more information, please visit this products webpage.
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*All prices are inclusive VAT (only within the EU) plus shipping costs. For shipments to third countries of the EU, the net price is shown on the invoice and there may be customs duties and taxes apply in the destination country, which are to be paid by the buyer on-site.