mhz19

Read CO2 concentration from MH-Z19 on Raspberry Pi.

Installation

$ go get github.com/tmsc4zht/mhz19/cmd/mhz19

Usage

$ mhz19
554

Use as a library

package main

import (
	"fmt"
	"os"

	"github.com/tmsc4zht/mhz19"
)

func main() {
	m := mhz19.New("/dev/serial0")
	v, err := m.ReadCO2()
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(-1)
	}
	fmt.Println(v)
}

---

Differences from the original version

• You can select serial device file to use.
• Close serial port after read value.
• Calc checksum.
• mhz19 prints only numeric value.
• mhz19 returns -1 when error happens.