When I first became interested in digital audio workstations (DAW) and computer-based music, I wanted to mix and sample and loop and sequence and make drum patterns and effects and this and that and the other thing. I was all over the place and wasn’t accomplishing much of anything until I decided to [...]]]>

Conectiv

When I first became interested in digital audio workstations (DAW) and computer-based music, I wanted to mix and sample and loop and sequence and make drum patterns and effects and this and that and the other thing.  I was all over the place and wasn’t accomplishing much of anything until I decided to focus and start with the basics:  beat-matching and mixing with a turntable.

While a computer certainly isn’t required to achieve these simple goals, a computer-based setup makes getting started easy and more affordable.  My technical expertise lies more in the digital domain than the analog one, so the ability to hack, re-program, and re-wire a digital system  was also very appealing.

I did some research and decided to use Torq software as the basis for my bedroom DJ setup.  It lets me beat-match on my turntable using time-coded vinyl through M-Audio’s Conectiv device (which also provides 2 audio input channels and 2 output channels) and mix using an X-Session Pro USB-MIDI control surface, which provides a tactile way to control Torq’s internal mixer and transport controls.  The Conectiv package also includes a licensed copy of Torq 2.0, making for a nice little setup for very little investment.  Finally, Torq will re-wire into Ableton Live if I want move beyond playing music and start to make my own.

X-Session Pro

This setup has worked well (mostly – still some bugs in the Torq software but no show-stoppers) as I “practice and n_joy” the many fine videos produced by the DJ Tutor.  These videos are vastly superior to any other DJ How-To video I’ve ever seen.  Most YouTube DJs are more interested in showing-off their egos than explaining what they are doing.  Each DJ Tutor video uses a well-framed shot that highlights the controls and actions, and ellaskins uses humour and sound teaching techniques to produce videos that are informative, entertaining, and always end with the catchphrase, “Practice and N Joy”.

Good advice for anything, really.

The turnout at this event was a fraction of the previous evening’s, even though the sights were more interesting, in my opinion. For this leg of the torch relay, the flame was carried 80 feet up and down a spur tree at the Squamish Logger’s Sports grounds.

The turnout at this event was a fraction of the previous evening’s, even though the sights were more interesting, in my opinion.  For this leg of the torch relay, the flame was carried 80 feet up and down a spur tree at the Squamish Logger’s Sports grounds.

The first picture was taken during Squamish Days 2006, but thought it might show just how tall these spar trees are.

I wanted to call this post, “Pole Smokers” but though the reference might be perceived as derogatory toward those who participated, so then I called it, “Flaming Poles” but that might have mislead the eastern European gay community (who all follow this site quite closely, I’m sure)

]]> http://andrew-stephanie.ca/torch-treeclimb/feed 1 http://andrew-stephanie.ca/olympic-torch-community-celebration-squamish http://andrew-stephanie.ca/olympic-torch-community-celebration-squamish#comments Fri, 05 Feb 2010 19:23:18 +0000 abythell http://andrew-stephanie.ca/?p=828

A third of Squamish was at Brennan Park to see the Olympic Torch.     Inspirational words were shared with the crowd by important officials.   Original phrases such as:

• “We’re all here because of you, Squamish!”
• “Go Canada Go!”
• “Are you ready to make some noise?”
• “These are *your* games!”
• “You can accomplish anything you set your mind to!”
• “This is the best crowd yet!”

and my favourite:

• “Thank you, mayor MacGregor.” (The mayor’s name is Greg Gardner. If only he had said, “Mayor McCheese“)

The generic Coca Cola stage show was about the weirdest bit of corporate propaganda I have ever witnessed, but the crowd’s red-white-and-red enthusiasm was for Canada, not Coke.  The torch was brought in, the cauldron was lit, and important officials patted each other on the back for a while.  There were some great performances by the Squamish Community,  including G. Jogi Daduwalia and the Squamish Bhangra Crew, and the West Coast Lumberjack Show.

The evening ended with some really good fireworks, but for some reason I was thirsty for a cola-like beverage, so we called a friend on my Samsung phone,  hopped in a Chevrolet, gassed up at the Petro Canada with my RBC VISA, then headed off to McDonalds.

OK, we didn’t do any of that stuff.  We went to the Shady Tree and had beer and chicken wings.

]]> http://andrew-stephanie.ca/olympic-torch-community-celebration-squamish/feed 0 http://andrew-stephanie.ca/dsc-differential-solar-controller http://andrew-stephanie.ca/dsc-differential-solar-controller#comments Sun, 10 Jan 2010 19:28:11 +0000 abythell http://andrew-stephanie.ca/?p=792 To control my domestic solar hot water system, I built a custom controller was built using the Arduino Duemilanove.   It reads temperature inputs from the tank and roof sensors to drive a relay that turns the circulator pump on and off.  Temperature readings are sent via serial port to a laptop which records and graphs the temperature data.  The graphs and data are sent wirelessly to a web server, that displays the current temperatures and status using a Google Gadget.

I designed, built, and installed the controller for around $100.  Here is a brief description of how to build your own DSC.  This is by no means an exhaustive, step-by-step guide, and you will require knowledge of electrical wiring, soldering, programming, Linux, web servers, and more.

Temperature Sensors

A single strand of Cat5 cable forms a bus for a network of Dallas DS1820+ 1-wire temperature sensors (datasheet).  The Cat5 cable is run from the controller (using RJ-45 connector), past the heat exchanger (for input, output, and tank sensors) and cold water inputs, then up onto the roof and into the temperature sensor well inside the solar collector.  Temperature sensors can be added anywhere along the bus using telephone 3-Wire Butt Splice (blue) connectors.  Be sure to crimp them tightly so that all the wires make solid contact.  Using TIA/EIA-568-B wiring:

• Blue = DQ (pin 2)
• Blue/White = GND (pin 1)
• Orange = +5V (pin 3)

Solder a 6″ lead to each leg of the DS1820.  Use higher-temperature wire for the roof sensor (125 C +).  Wrap leg #2 in 1/8″ heat-shrink, then wrap the entire device (all three legs and part of the semiconductor) in 1/4″ heat-shrink.

The temperature sensor can be mounted to a conductive surface (pipe, side of a tank, etc.) using 3M Picture Hanging Strips, Exterior Mounting Tape, or plain old duct tape.  They can also be inserted into metal knitting needles and sealed with epoxy to make probes.

Controller Hardware

Using the links below, you can order all the parts you need to build your own DSC, assuming you can read a schematic and solder (some surface mount parts).  Don’t forget to add at least 2 (4 is better) Dallas 1-wire temperature sensors (DS-1820) to your parts order.

• schematic for the DSC controller (PDF)
• digikey-partslist (CSV) – includes Digikey Part Numbers required to populate the PCB.  Other Digikey parts may be required – read on for a complete list.
• printed circuit board – order from Batch PCB
• Arduino Duemilanove – purchase online from SparkFun or Adafruit

The PCB is an Arduino shield that mates with the Duemilanove.  You could also build the controller on a prototype board or using a prototype shield from SparkFun or Adafruit.  As you can see from the schematic, the circuit is not that complicated, and most parts can be swapped or omitted, except for R1 (4K7) which is a required value for the 1-Wire bus.

The PCB is my design and can be used for non-commercial purposes, with no warranty.  It’s been tested though and is the same board design I am currently using to run my solar hot water system.  BatchPCB provides low-cost, small run, well made printed circuit boards.  The link above should allow you to place your own order directly without any middlemen (ie. Me).  I’ve used BatchPCB for many projects and have always been happy with the results.

The parts list has Digkey part numbers to all the components I used to populate the PCB.  If you notice Digikey no longer stocks a part, or you’re wondering about compatibility with other part numbers, please let me know.  Digikey has a reasonable shipping and handling fee, considering that you can place an order at noon today and have the parts on your desk by noon tomorrow.

A relay runs a 120V AC Grundfos UP26-99 circulator pump, which will draw at most 2.1A.   Make sure the relay can handle the current needed to run your pump (see datasheet), and if necessary choose another relay with the same footprint.  The relay listed is rated for 12A@250VAC.

Wiring and Enclosure

Because this circuit uses 12VDC and 120V AC, ensure you mount the controller in an appropriate enclosure and take all the usual precautions when dealing with electricity.   Required parts:

• metal or plastic (easier to drill) enclosure – 4x4x6 leaves lots of room for wiring
• LED lenses (need part number)
• AC Hour Meter (optional)
• AC Toggle Switch

The controller can be wired directly, or fitted with an AC plug.  The connection between the pump and the controller can also be made using AC plugs and sockets.

Firmware

Built with the Arduino environment and the Dallas Temperature Control Library.  Download the sketch.

Logging

The system can be monitored using the USB/serial port of the Arduino.  I use a bash script running on a linux laptop that is called from a cron job to read the state and temperatures via tty and insert them into a round robin database to create useful graphs.  The bash script also outputs an XML file, which is used as the data source for the Solar Hot Water Google Gadget.  Get the gadget and view the system status here.

You can also read some details on the installation of the collectors and the building of the heat exchanger, and there are some construction photos here.

Canada Day Fireworks