featured

My First Raspberry Pi Project

My First Raspberry Pi Project

View of the whole setup

View of the whole setup

Almost every year, I try to select a fun project to do while off for Christmas. This year the project I selected was based on Raspberry Pi.  Specifically I decided to build a device that would, when motion is detected, find the range to the motion using an ultrasonic rangefinder, take a picture using the camera module, and finally email me the results.

After just a few hours of work, I had separate proofs of concept working for each sensor written in Python.  A short time after, I started combining all the proofs of concept into a consolidated script which I got working.  Right now I am perfecting the classes for interfacing with the range finder and the motion detector and I am currently using picamera 0.8 for interfacing with the camera module.  I’ve included a link to the git repository I’m using for source control below.

Equipment:

  • Raspberry Pi Model B
  • Raspberry Pi 5MP Camera Board Module
  • HC-SR501 Human Sensor Module Pyroelectric Infrared
  • SainSmart HC-SR04 Ranging Detector Mod Distance Sensor
  • 5 180 ohm resistors
  • Breadboard and miscellaneous connectors

Source Code: https://github.com/chaddotson/PiPy

 

Posted by Chad Dotson in Featured, Hobbies, Neat Stuff, Raspberry Pi, 0 comments
The Early Days of Flight

The Early Days of Flight

This post started from a comment I made on facebook about the “Volocopter” story on CNN.  At the time my comment was “Why does this look like something from the early days of flight?”  That it turns out is a very good question and an even better follow-up, “Aren’t we in the early days of [motorized, human] flight?”About 50,000 years ago, humans reached what is called behavioral modernity[1], “the point at which Homo sapiens began to demonstrate an ability to use complex symbolic thought and express cultural creativity”[2].  I think that is the reference point I will use for this post.  Am I leaving something out?  You bet, a heck of a lot in fact.  Another reference point I considered using was the control of fire by homo-erectus 400,000 years ago[3].  I ultimately decided on using the data of behavioral modernity because even after tens of thousands of years separating, those humans are us both anatomically and behaviorally.  We’ll use this timeline of “modern humanity” throughout this post.

So back to the topic of the post:  “Aren’t we in the early days of [motorized, human] flight?”  I believe the answer is a very resounding “yes.”  If we think about history of boat/shipbuilding, I believe can get a feeling for how new it is.

Let us compare two examples of what humans have created at the endpoint’s of “modern humanity.”  At between 9,523 and 10,053 years old the Pesse Canoe is thought to be the world’s oldest boat[3].  The Pesse Canoe is a simple, dugout canoe discovered in the Netherlands.  Fast-forward approximately 10,000 years to the USS Gerald R. Ford (CVN-78) slated to launch in 2015[4] which will be the most advanced ship built by human-kind at the time of its launch.  We, all to often find ourselves bounded by the technological achievements since the beginning of the space race, but that’s 10,000 years of well-earned technological achievements.  I’m sure that somewhere here there is a Moore’s Law of human ability (I say ability because I don’t feel intelligence nor ingenuity to be the right word).  That ability is based on what knowledge we have gained up to that point in time.

First Flight on December 17, 1903

First Flight on December 17, 1903

So now that we’ve talked human technological advances in boat/ship building, let us think about what brought us here, human flight.  Rudimentary usage of the science (understood or not) behind flight have been understood for anywhere between 2,000 and 2,500 years[6] but it wasn’t until Leonardo da Vinci’s drawings in the late 1400’s that humanity really started showing an understanding of the concepts behind flight.  For the most part, Leonardo’s best flight related discoveries were because he studied and tried to copy nature.  While successful attempts in winged human flight have been made as far back as the first millennium AD, it was 1903 when the Wright Brothers (credited) finally achieved winged, motorized flight.  In the 110 years since we have constructed advanced aircraft such as the Airbus A380.

As it turns out, there are a lot of significant inventions marking the timeline of human creations.  So much so I believe it is necessary to add “when a technology becomes useful” as a simplifying assumption to my statement.  Under that premise, our current capability in shipbuilding is based on 10,000 years of progressive technological advances and while our current capability in motorized flight is based on the culmination of thousands of years of technological advancement, its only been 110 years since we put it all together.  So, the answer is yes, we are in the early days of motorized, human flight.

Disclaimer: I am a computer scientist not a writer or history scholar.  This post is a collection of what I believe and what I’ve put together from the internet.

References:

  1. “Behavioral modernity.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (8 November 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/Behavioral_modernity
  2. “Human.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (26 November 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/Human
  3. “Control of fire by early humans.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (24 November 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/Control_of_fire_by_early_humans
  4. “Pesse canoe.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (27 February 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/Pesse_canoe
  5. “USS Gerald R. Ford (CVN-78).” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (22 February 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/USS_Gerald_R._Ford_%28CVN-78%29
  6. “History of aviation.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (24 February 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/History_of_aviation
  7. “Early flying machines.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., date last updated (27 February 2013). Web. Date accessed (27 November 2013). http://en.wikipedia.org/wiki/Early_flying_machines

 

 

Posted by Chad Dotson in Misc, Ramblings, Technology, 0 comments
The Final Apollo Mission – December 7, 1972

The Final Apollo Mission – December 7, 1972

Apollo 17 Liftoff - December 7, 1942

Apollo 17 Liftoff – December 7, 1942

On December 7, 1972 (41 years ago today) the final manned mission to the moon blasted off from Kennedy Space Center.  Eugene Cernan was the last person to walk on the moon on December 14, 1972 at roughly 05:40 GMT. It is ultimately hard to believe that its been 41 years and we’ve not had a manned mission to Mars yet.  Even more astounding is the fact is that at this time we are between the Space Shuttle and its replacement, so we have no currently operational mode of launching humans into space.  The Orion capsule is currently under development and approaching ETF-1 (Exploration Flight Test-1), but that is scheduled for late 2014.

I got interested in the total time spent on the surface (just EVA’s for the Apollo missions) of of the Moon, you can find the figures on the table below.  You can tell by the figures when the Apollo missions started using the lunar rover.  I’ve also included drive distance of NASA’s Mars rovers.

Mission Surface EVA Surface Distance Covered
Apollo 11 2:31:40 Negligible
Apollo 12 7:45:18 2.0 km (1.2 mi)
Apollo 14 9:22:31 3.3 km (2.1 mi)
Apollo 15 19:07:53 27.9 km (17.3 mi)
Apollo 16 20:14:14 26.7 km (16.6 mi)
Apollo 17 22:03:57 35.74 km (22.21 mi)
Sojourner 100 m (330 ft)
Spirit 7.73 km (4.8 mi)
Opportunity 38.70 km (24.05 mi) – Ongoing
Curiosity 1 km (0.6 mi)+ – Ongoing

I leave you with this entry in the Sagan Series titled the “Gift of Apollo.”

 

References:

 

 

Posted by Chad Dotson in Misc, Ramblings, Technology, 0 comments
Tullahoma, TN Halloween Pirate Ship Decoration

Tullahoma, TN Halloween Pirate Ship Decoration

Took this picture of an awesome Halloween decoration in Tullahoma, TN this week… Complete with Kraken.

Posted by Chad Dotson in Misc, Photography, 0 comments
And all I ask is a tall ship and a star to steer her by…

And all I ask is a tall ship and a star to steer her by…

This weekend, I had a chance to tour the The Columbus Foundation’s replicas of the Niña and Pinta on one of its last days in port in Chattanooga, TN.

I took several photos, but I made a wallpaper quality version of one.  This is the rigging and top sail of the Pinta at the docks.

"And all I ask for is a tall ship and a star to steer her by..."

“And all I ask for is a tall ship and a star to steer her by…”

I also took this 360 degree panorama of the area including the TN Aquarium.

They are worth seeing.  You can find out more about them on the website below.

The Niña and Pinta – The Columbus Foundation – http://www.thenina.com/

Posted by Chad Dotson in Misc, Neat Stuff, Photography, 0 comments