read decibel value from GM1356 Digital Sound Level Meter

gm1356.js

// read decibel value from GM1356 Digital Sound Level Meter
//
// https://github.com/gymnasty/gm1356
// https://github.com/pvachon/gm1356
// https://github.com/dobra-noc/gm1356
// https://github.com/PhilippCo/soundmeter
const HID = require('node-hid');
const device = new HID.HID(0x64bd, 0x74e3);

device.on('data', function (data) {
  const db = (data[0] * 256 + data[1]) / 10;
  console.log(db);
});

device.on('error', function (err) {
  console.error(err);
});

const MEASURE_REQ = [0xb3, 0, 0, 0, 0, 0, 0, 0]; // XXX: need random data?

setInterval(function() {
  device.write(MEASURE_REQ);
}, 1000);