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TxD and RxD are connected to cross between RPi and mh-z18
sudo python3 -m mh_z19
MH>-Z19 not woring:
On the RPi-3, the bluetooth device gets the UART and the serial port presented is a less capable (buggy) interface that doesn't work for the MH-Z CO2 sensors.
See this discussion: https://www.raspberrypi.org/forums/viewtopic.php?t=142112
I usually just use the disable-bt overlay. Or I use a USB serial adaptor.