Author Archives: gregorykimball

Pitch to Color

Here is the color wheel used by my electronic instrument, Abella. When the music box is playing “C”, the pitch display appears yellow. Middle “C” is set at 262 Hz, high “C” at 523, and low “C” at 131 Hz, and each is displayed yellow. The remaining notes occupy a RGB-CMY color space.

DSC02514 Continue reading

Posted in and other things, Electronics, LED | 2 Comments

Shift registers and Voltage display

I’ve been having great fun with the Arduino Uno microcontroller board.  Here I’ve got the Arduino using a shift register to light up a 7-segment display output.

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Cars.com Data Miner

Need to organize data from the web? .NET framework has you covered.

page1 tab   page2 tab Continue reading

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Mustang for Sale

The end of an era!  My 1991 Ford Mustang just sold.

1991mustang listing Continue reading

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Heater Core Bypass

It turned out that there were only two MUST-DO items:  pass a smog check and bypass the heater core.

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So many cars!

Well, this time I decided to do some data mining on Cars.com to help me figure out what is going on with new and used cars in the area.  A little html parsing magic later, I was able to survey all of the new and used cars available in my target class: midsize sedans.

global data Continue reading

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Samurai II

I’ve been working on resurrecting my original Samurai game, except using some respectable 3D graphics, better user input and more realistic physics.  Samurai II is in the works.

samurai2 Continue reading

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Samurai!

The game was a project for me in 2004 using some very poor graphics library in C++ but despite its technical shortcomings… IT WAS AMAZING!!!

samurai1_arena Continue reading

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Introducing Abella

Sound and light!

abella1

http://www.youtube.com/watch?v=ccJRsY-8vOs

Here is some footage from early hardware development of “Abella,” my Arduino-powered electronic instrument. Yes, it is in a shoebox, and yes, the control knobs are popped through the cardboard. Continue reading

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USB car charger, 2A

The more I’ve learned about switch-mode power supplies, the more amazing it seems to me.  So a voltage source across a wide range of values can be converted into another voltage, just by pulsing current though an inductor.  Of course, switch-mode power supplies are even easier to set up with ICs like this one:

IC REG BUCK BOOST, 296-17764-5-ND

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