co2.ino

#include "M5StickCPlus.h"
#include "SCD30.h"

void setup() {
  M5.begin();

  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.fillScreen(BLACK);

  M5.Lcd.setCursor(0,0);
  M5.Lcd.setTextSize(2);
  M5.Lcd.println("START");

  Wire.begin();
  Serial.begin(9600);

  scd30.initialize();
}

void loop() {
  float result[3] = {0};

  if (scd30.isAvailable()) {
    scd30.getCarbonDioxideConcentration(result);

    M5.Lcd.fillScreen(BLACK);
    M5.Lcd.setCursor(0,0);
    M5.Lcd.println("CO2:");
    M5.Lcd.print(result[0]);
    M5.Lcd.println(" ppm");
    M5.Lcd.println("---");
 
    M5.Lcd.println("Temp:");
    M5.Lcd.print(result[1]);
    M5.Lcd.println(" C");
    M5.Lcd.println("---");
 
    M5.Lcd.println("Humidity:");
    M5.Lcd.print(result[2]);
    M5.Lcd.println(" %");
    M5.Lcd.println("---");

    Serial.println(String(result[0])+','+String(result[1])+','+String(result[2]));
  }
  delay(30000);
}

pi.js

const SerialPort = require('serialport')
const Ambient = require('ambient-lib')

const port = new SerialPort('/dev/ttyUSB0', {
  baudRate: 9600
})

let tmp = ''

const am = new Ambient(ch, key)

port.on('data', (data) => {
  tmp += data.toString()
  if (/\r\n/.test(tmp)) {
    const [co2, temp, hum] = tmp.split(',')
    am.send({d1: co2, d2: temp, d3: hum.replace(/\r\n/, '')}, (res) => console.log(res.status))
    console.log(co2, temp, hum)
    tmp = ''
  }
  console.log('rcv:', data.toString(), tmp)
})