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Messages - kc4zvw

Pages: [1] 2
1
General Maths / Math Puzzles (by the week)
« on: September 24, 2016, 11:45:51 AM »
About Project Euler  What is Project Euler? Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.


   https://projecteuler.net/about

2
Microcontrollers, Electronics, and More / Re: EagleCAD anyone?
« on: December 09, 2013, 04:25:49 PM »
Have you continued your studies and made any progress with Eagle CAD?

regards,

David


3
Parts Exchange / Re: In search of a utility trailer
« on: November 03, 2013, 08:08:03 PM »
At Harbor Freight store:

950-lb capacity foldable 4ft by 8 ft utility trailer with 8-inch wheels and tires (42709)

comes in a box and you build it

comes with birth certificate from China that the DMV uses for registration.   8)

regards,

David

4
Parts Exchange / Re: Looking to borrow JTAG programmer or AVR Dragon
« on: November 03, 2013, 08:01:53 PM »
Bill S. just found his JTAG ICE MkII. I think that'll work. :)

If you cannot get it to work I own a AVR Dragon!

regards,

David

5
General Science / Amateur Radio CubeSat
« on: October 06, 2012, 08:03:23 AM »
Break out your UHF receivers and some tracking software:   ;)

NASA Release Amateur Radio CubeSat Deployment Pictures

  http://www.uk.amsat.org/?p=10804

This is something to try and receive with the cheap $20 USB dongle wide-band receivers that are found on Ebay.

73,

David

6
General Discussion / AMSAT 2012 Space Symposium
« on: October 06, 2012, 12:11:55 AM »

7
Automotive / Re: mobile use of a small footprint computer
« on: September 22, 2012, 09:37:41 PM »
Don't know why you wouldn't want to use a cheap inverter. I use something like this.
 
http://www.homedepot.com/h_d1/N-25ecodZ5yc1v/R-202042608/h_d2/ProductDisplay?catalogId=10053&langId=-1&keyword=power+inverter&storeId=10051#.UFz6ouXkaSo
 
It works great and only costs $25.
 
P47

Thanks Mr. P47 for your serious answer and I might have to go that route.  Just always have to remember to shut it off if I don't drive the bus at least once a week.

I don't have a cup-holder though so different mounting will be required!  and if I did then where would I set down the Big Gulp?   ;D

regards,

David
--

8
Automotive / Re: mobile use of a small footprint computer
« on: September 22, 2012, 10:50:13 AM »
I'm confused, what are you trying to accomplish? What small computer? What target voltage?

The overall idea is to install a used Linux thin-client (Neowave C50) computer in a RV (actually a bus) that is not
wired for 115v AC.  Four of these units were purchased from SkyCraft a while back and I am in possession of one.

I want to see if it can be made to be a meda center or high capacity MP3 player that is permantly installed.  I do already own an inverter (800 watts) that should be enough power for a small TV set but had no plans to mount it close to the drivers seat.   Thought it would be a pain to have to leave the drivers position every time I started the vehicle or switched from radio to MP3 player listening.  At this time the location selected for mounting the thin-client computer was under the driver seat pedestal.

If this unit isn't going to work as planned because without mods it requires 115v AC I might hit Ebay and find something like a Wyse V90 or earlier thin-client computer with large SSD if one shows up for under $25.

Of coarse a Raspberry Pi in a armored case might fit the bill but still want the power supply to be powered off with
ignition key so that the main battery doesn't go dead while RV is not being driven.

regards,

David

9
Automotive / mobile use of a small footprint computer
« on: September 21, 2012, 05:55:22 PM »
All,

Wanting to power a small computer in a vehicle?  Need better idea than a wall wart plugged in to an inverter.

  12v battery --> 115v inverter --> power adapter --> computer (needed at least 12v)

Also a third-party power cube that plugs in the cigerette lighter socket is about $75-$100 dollars to power an under $20 computer.    :(

regards,

David

10
RC Stuff / Re: Local Hobby Shops
« on: September 20, 2012, 03:28:24 PM »
We'd started something like that on the wiki, but it didn't go very far:  wiki link

Almost remeber this page ... I made the two entries ...    :-\

regards,

David

11
RC Stuff / Re: Local Hobby Shops
« on: September 20, 2012, 10:16:14 AM »
skycraft i think needs to be mentioned. they are not rc or hobby but i have skycraft parts, screws, lights, switches, wire, tools, ect on all my rc cars, trucks and projects. they are the best.

This list would/should be expanded beyond just hobby (toys, radio control cars, rocket, and model trains) vendors.

How about a list of resources that would be of interest to the hardware and/or electronics hacker?

The older Yahoo!groups forums had an app that included the ability to build a database to include links to a Google map.  I had plotted the locations of vendors in the central Florida area that sold items of interest to users of surplus computer and electronic parts.

Various FamiLAB projects have used scrap/surplus wood, plastic and metals also obtained from local vendors.

regards,

David

12
The Stellaris LM4F120 LaunchPad Evaluation Board is a low-cost evaluation platform for ARM? Cortex?-M4F-based microcontrollers from Texas Instruments. The design of the Stellaris LaunchPad highlights the LM4F120H5QR microcontroller with a USB 2.0 device interface and hibernation module.

The EK-LM4F120XL also features programmable user buttons and an RGB LED for custom applications. The stackable headers of the Stellaris LM4F120 LaunchPad BoosterPack XL Interface make it easy and simple to expand the functionality of the Stellaris LaunchPad when interfacing to other peripherals with on compatible BoosterPacks.

   https://estore.ti.com/Stellaris-LaunchPad.aspx

13
Parts Exchange / a single wooden pallet
« on: September 14, 2012, 12:16:30 AM »
I need just one of these for a project:

  http://www.premier-pallets.com/

as long as it isn't too mangled and real cheap.


regards,

David
--

14
Group Projects / Re: Lasersaur. Lets get this bad boy built.
« on: August 14, 2012, 10:49:51 AM »

The controller board I have is from the LAOS folks.  http://www.laoslaser.org/ It is currently unpopulated, and I haven't gotten around to ordering parts for it yet. (I've been crazy busy lately)


This part of the project is interesting to me.   ::)

What version of the p.c. board?

regards,

David

15
Microcontrollers, Electronics, and More / Meeting Leonardo
« on: July 25, 2012, 10:32:46 AM »
All,

Anyone have one?

http://www.mouser.com/ProductDetail/Arduino/A000057/?qs=pqHpkKcI5TRVGxXMLAJHXV9HgQ%2fn2OKKjXKJ%2f9GfUPu%2fVYwFLzo5xA%3d%3d

  Mouser Part #:  782-A000057
  Manufacturer Part #:  A000057
  Manufacturer:  Arduino
  Description:  Development Boards & Kits - AVR ARDUINO LEONARDO
  Price: $21.95 (units of one)

even cheaper!  :o

regards,

David

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