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https://ru.aliexpress.com/item/MH-Z19B-Infrared-CO2-Sensor-for-CO2-Monitor-MH-Z19B-5000PPM/32774038947.html?spm=2114.13010608.0.0.OHzqKM
http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf
http://www.winsen-sensor.com/d/files/PDF/Infrared%20Gas%20Sensor/NDIR%20CO2%20SENSOR/MH-Z19%20CO2%20Ver1.0.pdf
var mhz19 = require('mhz19.js').connect({ rx: <rx_pin>, tx: <tx_pin>, port: <serial_port>, <<speed: 9600>> });
console.log( mhz19.read() );