mcoms

source 'https://rubygems.org'
gem 'midilib', '~> 2.0.4'

mcoms

#!ipxe
dhcp
echo Starting Ubuntu 12.04 i386, non-pae installer for ${hostname}
set base-url http://archive.ubuntu.com/ubuntu/dists/precise-updates/main/installer-i386/current/images/netboot/non-pae/ubuntu-installer/i386
kernel ${base-url}/linux
initrd ${base-url}/initrd.gz
boot ||
# If everything failed, give the user some options
echo Boot from ${base-url} failed
prompt --key 0x197e --timeout 2000 Press F12 to investigate || exit

mcoms

# Wemux demonstration container
# =============================
# docker build -t wemux .
# docker run -t -i -d -p 2255:22 wemux
#
# ssh -p 2255 root@<host>
#   root : screencast
# ssh -p 2255 user@<host>
#   user : password
#

mcoms

require 'nokogiri'
require 'open-uri'

doc = Nokogiri::HTML.parse open('http://www.itjobswatch.co.uk/contracts/london/ruby.do')

# Inside London...
cells = doc.css('table.summary>tr').find {|tr| tr.css('>td').text =~ /Average daily rate/ }.css 'td'
daily_rates = { three_months: cells[1].text, last_year: cells[2].text, two_years_ago: cells[3].text }
# => {:three_months=>"£425", :last_year=>"£400", :two_years_ago=>"£375"}

mcoms

require 'nokogiri'
require 'open-uri'
require 'json'

doc = Nokogiri::HTML(open('http://www.mysupermarket.co.uk/asda-compare-prices/Spirits/Havana_Club_Rum_Anejo_7_Year_Old_700ml.html'))
prices = doc.css('#PriceComparison .StoreDiv').map {|c| { name: c.css('.ImgSpan img').first['alt'], cheapest: c['class'].include?('Cheapest'), price: c.css('.Price>span.priceClass, .Price>span.Offer').text.strip } }

# => [{:name=>"ASDA", :cheapest=>true, :price=>"£18.00"},
#  {:name=>"Tesco", :cheapest=>false, :price=>"£23.30"},
#  {:name=>"Ocado", :cheapest=>false, :price=>"£23.30"},

mcoms

Ideas

• Digital radio transmitter or receiver
• GPS/GPRS tracker
• High atmosphere air current tracking using balloons, and a pi/arduino with GPS and recording
• Launch something that goes out of sight, then track/find it using your favourite protocol
• Amateur radio beacon hunting using your own equipment
• SMS remote control
• 555 timer based signal generator
• Piezo based floor piano

mcoms

RTL-SDR tips and tricks

Sample format

The output is IQ (quadrature) sampling. It's interleaved, so first byte is I, second Q and so on. The samples are unsigned bytes, so you subtract 127 from them to get their real ralue (lying between -127 and +127).

rtl_tcp control

Send a command byte followed by a 32-bit big-endian int parameter.

mcoms

def find_path(entry)
  path = []
  until entry.parent.name == 'Root' do
    entry = entry.parent
    path.insert(0, entry.css('>Name').text)
  end
  path
end

def insert_entry(entry)

mcoms

Wishlist

This is a list of random junk which I'm looking for, for various projects. In the spirit of http://uk.freecycle.org/, I like to recycle things where I can. I also have a box of odds and ends, so if you're looking for something electrical or mechanical, let me know as I might have it :)

• Fire extinguisher/air tank
  • Doesn't have to work, but should be airtight
    • Ideally not a CO2 extinguisher
    • To be used as a 100psi air compression chamber
• Arc welder/welding supplies
  • For welding steel, etc.

mcoms

require 'fileutils'
# Set the directory containing your backup files (they can be in sub-directories of this path)
f = Dir.glob './**/*.wbfs'
f.each do |n|
  x = `wwt LIST \"#{n}\"`
  if $?.success?
    # WBFS containers can have multiple games in them. Here, we select just the first one for naming.
    # Nearly always, you will have only backed up a single game per container anyway.
    (id, name) = x.split("\n")[3].split(/\s{2,}/)
    if id && name