With this node you can read the CO2 values of your MH-Z19 CO2 sensor. You can also use this node to configure your sensor.
On Raspberry PI there is the serial console default on your serial port. Disable it to use it with your MH-Z19 CO2 sensor as described in the official docs https://www.raspberrypi.org/documentation/configuration/uart.md
Connect 5V (PIN 2 or 4) to Vin of CO2 sensor.
Connect GND (eg. PIN 5) to GND of CO2 sensor.
Connect TXD (PIN 8) to Rx of CO2 sensor.
Connect RXD (PIN 10) to Tx of CO2 sensor.
Set msg.payload to getCO2 to get current CO2 values or to ABCoff to disable error prone automatic calibration every 24 hours. More in the node’s help tab.
GPLv3