browser.js

const {ipcRenderer} = require('electron');
const DecibelMeter = require('decibel-meter');
const conf = require('./conf.json');

const meter = new DecibelMeter('wildMicro');
const level = document.querySelector('h1');
const maxDisplay = document.querySelector('h2');
let max = 0;
let readyToNotify = true;
let realDb;

meter.connectTo('default');
meter.listen();
meter.on('sample', dB => {
	realDb = Math.round(dB) + 100;

	// Notification
	if (realDb > conf.maxDb) {
		console.log(readyToNotify, conf.secondsBetweenNotifications);
		if (readyToNotify) {
			ipcRenderer.send('tooLoud', 'ping');
			readyToNotify = !readyToNotify;
			setTimeout(() => {
				readyToNotify = !readyToNotify;
			}, conf.secondsBetweenNotifications * 1000);
		}
	}

	// Rendering
	level.textContent = `${realDb} dB`;
	if (realDb > max) {
		max = realDb;
		maxDisplay.textContent = `Max : ${max} dB`;
	}
});