Grennan.com

A day of speed

Posted on April 28, 2012 by mark

Today is a good day of speed flying at the Oklahoma Speedfest. This has become an annual event of RC contesting. There is also a great display and demonstration of scale planes.

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San Francisco Zoo

Posted on April 14, 2012 by mark

The SF Zoo is a great place. I loved my morning.

But SF has a bit of a homeless problem and they know how to spot a rental car. I had my stuff in the trunk and they broke in just to see what might be there.

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The big build

Posted on April 1, 2012 by mark

I have started building my quad copter. It is a 3D quad copter design. It has GPS, altimeter, three way gyros, sonic ground detector, magnetic compus, camera relay and radio telemetry.

Posted in Electonics | Leave a comment

Spektrum Transmitter Battery Polarity Reversed

Posted on March 23, 2012 by mark

Today I bought a Spektrum upgrade battery from my DX8. The SPMB4000LPTX Transmitter Battery from my local hobby shop. After plugging in the new batter and turning on the radio, the radio bused (normal if you have the throttle up) but then it popped and smoked.

The battery leads reversed reversed. I didn’t think to check the polarity from the original equipment manufacture.

The original batter is on the left and the new (BAD) batter is on the right. You can see the connectors are the same way up but the wires are reversed. The connector is keyed.

I’ve called Horizon Hobby. They are sending me a return for service box. I’ll tell you how the story goes.

BE CARFULL. I’d rather be flying the writing this blog post.

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Let Storm Season Begin

Posted on March 13, 2012 by mark

Seen on my way home today. You would thing this would be mundane for me because I work across from the sever storm lab.

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My PhotoDuino

Posted on March 5, 2012 by mark

I’ve started a new electronics project. Think camera meets Arduino. Photoduino is as an existing project. I’m using a Arduino mega to add a stepper to drive a dolly on a track and take pictures.

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A cameraman of many colors

Posted on February 21, 2012 by mark

I meat many nice people on the bus.

Posted in A photo a day | 1 Comment

Sunset at the lake

Posted on February 16, 2012 by mark

I love you Linda.

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I have proof of UFOs

Posted on February 8, 2012 by mark

Un-maned Failover Operations

I have video of two MySQL servers (one master, on slave) failing over from Master to Slave. The Master becomes the Slave and vise-verse with the slave becoming read-only.

Posted in Uncategorized, What I learned today. | Leave a comment

Vet school

Posted on January 31, 2012 by mark

My daughter texted me with this:

“This is what i do when im tired of studying.”