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April 2014

- I developed an Excel-based Depth-of-Field calculator for photography applications. The article can be found here.

- I've been having fun adapting old lenses to my Sony NEX camera. Today, I publish my findings on using 200mm telephoto lenses: "The battle of the 200".

March 2014

- New tutorial on how to use small flash units in manual mode.

- Posted my impressions of the Metabones Speed Booster, Canon EF to Sony E-mount (NEX) lens adapter.

- Added a new "Time" photo gallery. A series of composite images on the meaning of time.

February 2014

- Reviewed the entertaining book "A short history of nearly everything".

- Added a new "Color Portraiture" photo gallery.

January 2014

- Reviewed the excellent book "Excel 2007 Power Programming With VBA".

- Created a new photo gallery: Old Sacramento.

- Published a review of the Rokinon 8mm fish-eye lens for Sony NEX cameras.

December 2013

- Published a new article on "Diode temperature sensor calibration using Arduino and SHT15 module"

- Published my review of the surprisingly good book "The Happiness Advantage".

- Re-organized my "Photography Galleries" and added some new ones, including "Point Lobos" and "Coach Junkyard".

November 2013

- My first Arduino project: "Arduino Astronomical Clock for Automatic Light Control"
  UPDATE: This article was featured in:
  hackaday.com
  lifehacker
  freetronics 

- Published a review of the book "Isaac Newton".

October 2013

- In time for Halloween 2013, check-out my new electronic pumpkins project. (Featured now also in hackaday.com).

- Published my review of the excellent book "Supercrunchers".

September 2013

- Published a review of the book "The Story of Mathematics: From Creating the Pyraminds to Exploring Infinity".

- Published a review of the book "All of Statistics: A Concise Course in Statistical Inference".

August 2013

- If you own one of those analog CRT oscilloscopes, you may have trouble taking photos of the screen. The "OscilloCam" comes to the rescue.

- Published a review of the book "The History of Statistics: The Measurement of Uncertainty before 1900".

July 2013

- It's been a "chaotic" summer here at paulorenato.com. Two new articles on Chaos:

 A review of the book Chaos: Making a New Science 

 A new article on Excel based Chaos

June 2013

-Two new and related articles:

 New Life for an old Drill.

 How to measure rpm with an oscilloscope

May 2013

- Reviewed a biography of the great American Physicist Richard Feynman.

- There is no direct way in Excel to implement integration for a continuous function. In this new article, I explain how to approximate the integral for a function using a neat technique know as "Gaussian Quadrature".

Posted a review of the Olympus OM 200mm f/4 lens adapted to a Canon Digital Rebel.

April 2013

- Published a new article analyzing how combining many resistors improves the overall tolerance of the equivalent resistor. A fun little problem that actually required some mathematics:)

- Reviewed the book "The Power of Habit: Why We Do What We Do in Life and Busines".

March 2013

- New article on how to build an ESR meter to find defective capacitors.

  UPDATE: This article was featured in the hackaday.com blog.

- Reviewed the excellent book "Abundance - The Future is Brighter Than You Think".

February 2013

- Published two new and related articles

  - A new article on how to build a A Karaoke mixer and amplifier for the iPhone

    UPDATE: This article was featured in the hackaday.com blog.

  - A transistor amplifier calculator that many electronics hobbyist may find useful

    UPDATE: This article was featured in the Dangerous Prototypes blog.

- Reviewed the book: "RF Circuit Design" by Chris Bowick.

January 2013

- Published a new article on how to build a high-bandwidth "Lo-Z" probe.

- Reviewed the book: "The Mystery of the Aleph".

- Starting the new year with a book review:  "So Good They Can't Ignore You" by Cal Newport.

December 2012

- Tis the season for singing. Today I publish article on how to build a (very) simple mixer for a Karaoke system based on YouTube streaming.

- Added a new review for the book "Makers" by Chris Anderson.

November 2012

- Added a new book review for the excellent book "The Signal and The Noise" by Nate Silver.

- New article: How to make a cheap panel voltmeter from a dollar-store pedometer.

UPDATE: This article was featured in the hackaday.com blog

October 2012

- New article: Fume Extractor for the Electronics Workbench.

- Added a new article on how to build an adjustable constant current load. 

UPDATE: This article was featured in the hackaday.com blog.

September 2012

- Added a new book review for the excellent book "Energy for Future Presidents" by Richad A Mueller.

- Published a new article on how to build a LED fader for home lighting applications with two-level settings. It uses a notebook supply to feed a light strip with Cree XM-L power LEDs.

August 2012

- Completed a new article on how to build a battery operated light-box. Useful for product photography, macro shots and photographing small objects in general.
UPDATE: This article was featured in the hackaday.com blog:)

- Added a new article on how to build a flood detector from a dollar-store "panic" alarm.

July 2012

- Added a new article on how to build an AC-powered USB charger for toys or other devices by re-purposing an old cell-phone charger.

- Added a review for the very entertaining book "Moonwalking with Einstein".

June 2012

- I was recently in the market for a new car and also selling an old one. My experience resulted in two related articles now online: "How to Photograph a Car for Sale" and "How to Negotiate a Car Purchase Online".

- Solar energy experiments can be quite fun. In this new article, I show how to build an important component for many solar powered systems: your own solar charge controller.

May 2012

- Added a new book review for the excellent book "Looking at Photographs".

- Posted a review of the Olympus OM 24mm f/2.8 lens coupled with the Sony NEX-5N.

April 2012

- Ever got frustrated when cleaning your camera sensor? Using  a sensor lopue can make the whole process so much easier. In this new article, I show how you can build one yourself.

- Proud to announce that an article I wrote is now published in the May 2012 edition of the Nuts & Volts Magazine. The article is titled: "Sound Activated Laser Parking System". Be sure to get the Magazine!

 laserparking

- Tired of those uncomfortable "neck straps" for your camera? Today I published an article showing how you can build a much better camera strap yourself. Introducing the "Rapidinha Camera Strap".

- New article reporting my experience using an "old" 50mm f/1.4 Olympus OM lens with the Sony NEX-5N.

March 2012

- New article with some thoughts on panoramic composition.

- Added a new article showing how to build a simple sound activated DSLR camera trigger.

January 2012

- Added several new photos to the "Latest Work Gallery".

April 2011

- Added several new photos to the "Latest Work Gallery".

January 2011

- Point Reyes is one of my favorite spots in Northern California. Today I'm posting a new Gallery from Drake's Beach in Point Reyes.

November 2010

- Following a snow hike in Northern Italy near Lecco, I'm posting a new Gallery.

July 2010

- I'm happy to announce that my photography work is on exhibition at the Butch & Nellies Coffee Shop in Midtown Sacramento (corner of 19th and I Street) from July 4th to August 8th. The "official" opening will be on July 10th on the second Saturday art-walk from 6PM to 9PM so please come on down to see the exhibition.

June 2010

- California's Death Valley and Alabama Hills are some of my favorite locations in the state. Following a weekend trip, I'm posting a new gallery.

May 2010

- California is home to some very interesting "State Historic Parks"; some of them unknown to most people. The Indian Grinding Rock SHP is one good example. Please have a look at the new "Indian Grinding Rock State Park" gallery.

March 2010

- Added a new "Jack London State Park" gallery.

- Added several new photos to the "Latest Work Gallery".

February 2010

- Added a new Doors gallery.

- From time to time, I like to open-up gadgets and see what's inside. This weekend, I came across an old slide projector for $8 and had the idea of re-using one of its lenses with my DSLR. My new "Downtown" series of photos was taken with this new Blurromatic (TM) lens "technology"... Check it out. And if you are interested in building one of these, see this new article.

- Portraiture is a style of photography that intrigues me. While I don't consider myself primarily a "fashion photographer", I do like to experiment new things.. it's a new year after all. In that vein, I started a "Portraiture Section" on the website with local model Kayla. Check it out.

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