ir.js

var Gpio = require('onoff').Gpio
var signal = new Gpio(23, 'in', 'both')
var _ = require('lodash')

var captureTimeOut
var startTime
var data = []

signal.watch((err, val) => {

  if(!captureTimeOut) {
    startTime = microsecond()
    captureTimeOut = setTimeout(capture, 1000)
  }

  var now = microsecond()
  var pulse = now - startTime
  startTime = now
  data.push([val, pulse])
})

function microsecond(){
  return Math.round(process.hrtime()[1] / 1000)
}

function capture(){
  var onlyOnes = _.filter(data, x => x[0]==1)
  var bin = _.map(onlyOnes, x => x[1] > 1000 ? '1':'0').join('')
  var hex = parseInt(bin, 2).toString(16).toUpperCase()

  console.log('-------------')
  console.log('binary', bin)
  console.log('hex', hex)

  // reset logic
  data = []
  captureTimeOut = false
}