MH-Z19B

Communication with the MH-Z19B IR CO2 sensor for Node.js

Declare

``let mhz19b = new MHZ19B('/dev/serial0');`
The default UART port is _'/dev/serial0'_

Commands

Promise based
`
let mhz19b = new MHZ19B();
mhz19b.readCO2()
.then(data => {
console.log('CO2 reading', data);
})
.catch(err => {
console.log('error', err);
})
`


Event based
`
let mhz19b = new MHZ19B();
mhz19b.on('CO2', (data) => {
console.log(${data.co2});
});
mhz19b.readCO2();
`

Calibrate sensor baseline - set current level to 400 (do outside)
`
let mhz19b = new MHZ19B();
mhz19b.calibrate();
`

Enable / Disable ABC mode (auto-recalibration to 400 ppm every 24 hours)
`
let mhz19b = new MHZ19B();
mhz19b.abcOn();
mhz19b.abcOff();
``