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How Long Would a Raspberry Pi Last on AA Batteries?

UPDATE !   I have recently redone the testing with a new method that proved succesful.  Please go to the my new posting How to Test a Raspberry Pi Powered by Alkaline AA Batteries   I really love the Raspberry Pi.  It’s a great platform for someone with limited electronics experience, but much PC experience. When I start to wonder about what kind of invention i would like to make with the RPi, I gravitate to autonomy.  That is, designing a device with the Raspberry Pi centrally, and some peripherals that…

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CACTI Tuning – Script to Monitor Cacti Polling Time

Update 2017!  Review my article then see https://github.com/patrickscottbest/hammerOID my new script that generates this graph automatically for you. One of the most critical points when tuning Cacti is to consider the duration of the polling cycle. It’s important to reduce the amount of time the polling cycle takes for a number of reasons Short polling cycle times result in more avialability of the processor on the system to perform other tasks, such as serving graphs and web pages to the clients Consistently short polling times indicate a lean and trim polling…

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A Great Horsepower to Torque Conversion Chart

I was just working on a project tonight – and ran across this great chart.    It’s an old-fashioned draw-a-line 2D calculator. So it’s possible to have 100HP at with 10000lbs of Foot-Pounds torque at 60 RPM.  Then you break your engine.  Enjoy! Thanks to the electric toolbox http://www.elec-toolbox.com/ for the graphic.

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The days are getting shorter – Perl Script to Calculate Sunrise and Sunset

Hi Everyone; I made a great perl script to calculate sunrise and sunset times in Toronto for the whole year with a graphical output. I wrote this in my dead-time during a work order tonight… so I hope you enjoy it as much as I enjoyed making it. Notes: my brother’s birthday, which is right around the corner is day 286.  That’s a g33ky number. Here’s a day-of-the-year number calendar . does not account for Daylight Savings Time changes the output is in decimal form (.1 hours is about 6 minutes)…

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Home Made Inclinometer

[digg=http://digg.com/space/DIY_Astronomy_Tool_Inclinometer_or_Altitude_Measurer] I made a DIY inclinometer for astronomy. This sometimes is called an “altitude measurer” and can be used to spot how high a model rocket goes. Mine’s a little Newtonian, and I love it. I printed out a picture of a protractor, stuck it on a board with tape, and now I can “sight” along the top of the board. That’s right, I can read the angle i am looking at from a string dangling on the side. That string has a weight on the end. I have a…

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