CO2 Soil Respiration Chamber

More about CO2 sensors:

MH-Z16:

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

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

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

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

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