CO2 Soil Respiration Chamber

CO2 soil chambers

Comparing sensors and chambers

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More about CO2 sensors:

Nondispersive infrared sensor

MH-Z16, available with an I2C board:

• https://sandboxelectronics.com/?product=mh-z16-ndir-co2-sensor-with-i2cuart-5v3-3v-interface-for-arduinoraspeberry-pi

MH-Z19:

This page is about the MH-Z19 CO2 sensor and some experiments done with it:

• https://revspace.nl/MHZ19

Using the MH-Z19 CO2 sensor PWM readout, simple arduino code:

• https://electronics.stackexchange.com/questions/262473/mh-z19-co2-sensor-giving-diferent-values-using-uart-and-pwm

• https://www.mikrocontroller.net/topic/386920

More on ABC, Automatic Baseline Correction

• https://www.co2meter.com/blogs/news/9290675-automatic-background-calibration-abc-in-senseair-co2-sensors-explained

Immerhin kann man den Sensor per Hd-Pin (7s gegen GND) auf 400ppm (Außenluft) eichen.

• https://github.com/letscontrolit/ESPEasy/issues/466

CCS811

CCS BME combo

https://learn.sparkfun.com/tutorials/ccs811bme280-qwiic-environmental-combo-breakout-hookup-guide#resources--going-further

This one I ordered 2.... but check I2C adress. and connect "WAK" to GND

• #define CCS811_ADDR 0x5A //Alternate I2C Address
• myBME280.settings.I2CAddress = 0x76;

https://www.tindie.com/products/onehorse/air-quality-sensors/