Takes a LabNation export, and finds transitions. The file can be loaded in D3, for visualization

compress.rb

#!/usr/bin/env ruby -w
require 'csv'

file = ARGV[0]
out = file.split('.').join('-compressed.')

unless file
  puts "Usage: compress [filename]"
  exit(-1)
end

CSV.open(out, 'w') do |csv|
  index = 0
  sample_period = 0
  last = 0
  high = 12
  low = 0
  threshold = (high - low) / 2

  CSV.foreach(file, headers: true) do |line|
    val = line['ChannelA_Acq00000'].to_f > threshold ? high : low

    if index == 0
      sample_period =  line['SamplePeriodInSeconds']
      csv << [ 0, val ]
      last = val
    elsif val != last
      ts = sample_period * index

      csv << [ ts, last ]
      csv << [ ts, val ]

      last = val
    end
    index += 1
  end
end