Joey Thompson's Blog - All Comments

RE: Im Back (I think)

Fred27 — Sat, 18 Jul 2020 18:31:59 GMT

It's odd how this old thread has popped back up to the top. Joey Thompson may have been back, but it seems like he disappeared again years ago.

RE: Im Back (I think)

dubbie — Wed, 15 Jul 2020 17:15:06 GMT

Are you going to give us some interesting examples? (with workings out obviously)

Dubbie

RE: Im Back (I think)

uscdadnyc — Tue, 26 Jul 2016 19:11:03 GMT

Shades of Bruce Springsteen's "Glory Days". Nostalgia abounds.Too bad I gave away my (circa 1970) copy of Kreyszig Adv Engr Math Text. The latest edition is was over $100. For ROI (Return On Investment), I buy the Schaum Outlines Series. What does JT use?

I am not totally Mired in the Past though, I use a Student Edition of MatLab. In Sept 1969 at SU as a Frosh Engineering Student, I took a Computer Methods in Engr. The course used the APL Language Timeshared on an IBM 360. Every time I start Matlab, I flash-back to 1969.

USCDADNYC (NY NY USA)

RE: Im Back (I think)

DAB — Tue, 26 Jul 2016 17:59:09 GMT

Hi Joey,

I had extensive DE exposure back in school, but I have to be honest, I have rarely used it in my career.

But if you enjoy playing with equations, try using DE in Maxwell's Equations.

I have been reviewing those to see if they effect my new atom model.

So far, my approach satisfies all of Maxwell's laws for how charges and magnetic fields interact, so I think I am on the right track.

DAB

RE: Im Back (I think)

kulky64 — Tue, 26 Jul 2016 16:07:48 GMT

I like ODEs too, Laplace transform, stability analysis and all that good stuff.

RE: Pi Cam (Spy Cam) Update

Former Member — Wed, 01 Jun 2016 19:40:29 GMT

Hi there Joey. Been reading your blog. We have similar very similar interests. I too built a MAME machine many years ago - kids love it and still going strong, although the screen popped and I had to replace it with PC screen - not the same.

I fly RC - not jets, but I do have several pinball machines.

I have also been toying with the idea of making a simpler trailer connection - on the back burner for now.

I have a camera project that I want to do, but I lack experience with micros and it will take me way too long to get it right.

If you are interested, please reply and we can discuss it.

Thanks a stack...

RE: Pi Cam (Spy Cam) Update

shabaz — Mon, 04 Apr 2016 17:14:49 GMT

Nice spycam : )

I have exactly the same basket - I use it for storing component tubes/trays!

RE: Quick Project: Pi Security Cam

screamingtiger — Mon, 04 Apr 2016 13:06:07 GMT

I have posted an update to this in my blog.

RE: December has been a hard month, but still accomplished 1 project

DAB — Fri, 18 Dec 2015 19:14:56 GMT

During events like this, you just hope for the best and carry on.

Last year we had to put both of our dogs down about six months apart. It was tough, but you have to carry on.

Take care of your family first, then you can justify time for other activities.

Keep positive.

DAB

RE: Quick Project: Pi Security Cam

screamingtiger — Fri, 18 Dec 2015 15:51:56 GMT

I have completed this project, but not posted details yet for a good reason. I will update my blog and then come back here and update this blog.

I ended up using a USB camera instead of the Pi Cam. Slower and lower resolution of course but cheaper and certainly not so fragil!

It turned out well, and is disguised very well, stay tuned!

RE: Quick Project: Pi Security Cam

screamingtiger — Tue, 01 Dec 2015 14:14:57 GMT

Theres nothing original about this project, pretty easy actually. Ben heck did something similar recently. There are free apps that will make a cell phone do the same types of things.

I just chose to use a raspberry pi since I have on hand and doing it this way gives me the most control over the functionality. The free phone apps I tried leave the videos on the phone so if a lot is going on it could run out of space. My script will delete old videos but also ensure that if space is running out I get notified.

I found with the proper settings a 1 minute video is about 5mb so a 32gb card should provide enough buffer.

Its also cool the motion software will allow real time viewing via a web browser.

Im placing on order to Amazon shortly to get a bunch of gifts, so the parts I need are coming from Raspberry Pi via Amazon.

RE: Quick Project: Pi Security Cam

mcb1 — Mon, 30 Nov 2015 23:32:57 GMT

This will be an interesting build.

There was a similar one done a few years ago "Catch Santa Challenge" http://www.element14.com/community/roadTests/1220

Pi Cam without the IR filter. ....... but it is able to see in the dark even without an IR source.

You might find that it is better, but the sensitivity isn't enhanced, so having an IR light source will help.

You can see a couple of examples in the pdf attached to this blog.

http://www.element14.com/community/community/raspberry-pi/raspberrypi_projects/blog/2014/01/29/catch-santa-challenge

Mark

RE: Quick Project: Pi Security Cam

DAB — Mon, 30 Nov 2015 22:13:25 GMT

Great idea,

I will be following your progress with great interest.

DAB

RE: Pending Projects

DAB — Tue, 06 Oct 2015 21:19:35 GMT

I have never found enough time for all of my interests.

The plane fuselage looks nice and you plan for the pumpkin should freak out some kids.

DAB

RE: How High, How Fast and How Hard? Project to find out.

screamingtiger — Mon, 14 Sep 2015 04:54:18 GMT

I think I my be wrong to directly add the climb or dive rate to the horizontal velocity. I have to think it through though. The dive rate has a horizontal and vertical component. However the horizontal would already be accounted for in the horizontal calculation, since it resulted in a delta X and a Delta Y. The delta Z would be the absolute dive rate so I think I may be correct to directly add it after all.

In worse case I can ignore the Z component and simply use the x/y horizontal components, just knowing that I may be going faster than stated in a dive.

Perhaps on the interface I will show the horizontal speed, vert speed, and the combined.

BTW, calculating velocity is not difficult with a GPS. All you have to do is get the current lat and long, wait some time, and retrieve those values again.

The methods I have seen use arclength to calculate the distance between two GPS points, but honestly for the short distances I would travel in 1 second its not necessary and a simple Pythagoras would be suffice.

The reason arclenth is used is because the earth is curved.

When traveling in a large aircraft for many hours and thousands of miles, tracking location is more difficult. The magnetic declination changes, the earth rotates underneath you, not to mention the Coriolis force has a play in it. If you are traveling fast enough, you may even need to account for time dilation.

All I need is speed, which is the distance tavelled over the time it took to travel that distance.

Yes, planes may use a lot of computer power, but many navigation systems were developed in the 1970s. The Arduino 16MHZ probably rivals most air craft in computing power [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-8e89e1f2-282a-43c9-acc3-50215fb09601/contentimage_5F00_1.png:16:16]