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Josh Koffman | 1 Feb 01:10
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Re: [PIC] PICKIT3 or PICKIT2 in need of a home?

On Sat, Jan 31, 2009 at 5:21 PM, solarwind <x.solarwind.x <at> gmail.com> wrote:
>> do debug on simpler ships (ie 18f2550)? Will the 3?
>
> --
> solarwind

Um...is that what you intended to send?

:)

Josh
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Peter | 1 Feb 02:24
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Re: [EE]: Please help finding the Steinhart-Hart coefficients of a NTC

Electron <electron2k4 <at> infinito.it> writes:
> again the coefficients, I was going to thank everybody that replied (and 
>I do..) when this post came!

Please consider maxima seriously, it is much more general and you will likely
need it some more. The url again:

http://maxima.sourceforge.net/

enjoy,
Peter

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Peter | 1 Feb 02:36
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Re: [EE] How would an outlet/plug simulation be done?

Bryan Bishop <kanzure <at> gmail.com> writes:
> in consumer electronics into improper outlets. What are the effects?
> Do things go up in flames? Do the clouds swarm around your location,
> what? And is it predictable by some simulation software rather than me
> having to go do a resistor/xyz-component model to nanoscale accuracy?

In general multi-voltage power bricks will work but ymmv. In particular it is
very likely that the electrical stress standards are different and that a
'foreign' converter will die at or after the next best more serious surge that
will leave 'local' device unaffected. Happened to me.

Most smoke let-out phases occur with cheap devices whose 'certification' was
rubber stamped onto them in some courtyard. This is the case for non-brand name
products (made in .....) and sadly also for some very good innovative products
made 'locally' without real experience with 'foreign' power systems. This often
includes microprocessor based systems built in small series and supplies with
sub-standard wall warts. Yet another reason NOT to ship a wall wart across the
ocean. Besides from the additional shipping weight, that is.

Peter

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Dave Lagzdin | 1 Feb 02:39
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Re: [EE] Charging NiMH batteries

2009/1/30 Bob Axtell <engineer <at> cotse.net>:
> We use NiMH extensively. Our packs are 12V and 18V at 3500mAH. While
> lithium packs DO have power advantages, they have terrible
> restrictions when shipping (your product is then  considered a
> hazardous shipment). Lithiums are also VERY unforgiving when charging.
> Our chargers have NO trouble seeing the "end charge" dip.
>

What would your charge currents be Bob?
Keeping the current high enough to see the dip yet not cook the cells
 is like threading a needle IMHO.
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peter green | 1 Feb 03:06

Re: [PIC] PICKIT3 or PICKIT2 in need of a home?


>
> The problem I see is that it looks like the 3 is twice the price of
> the 2, and I can't quite figure out what the advances are. 
Looking at the schematic it seems the main difference is the 
microcontroller used. The pic programming/debug protocols are quite 
complex and not well suited to drive from standard serial hardware. 
Therefore the lower end programmers have to bit bang them (realice and 
ICD3 use FPGAs afaict but thats an expensive option). The 24f in the 
pickit 3 is going to be able to bit bang them considerablly faster than 
the 18f in the pickit 2. Not really going to make much difference if you 
only use the 8 bit pics but on the high end stuff it will probablly make 
a noticable difference.
> Does the 2
> do debug on simpler ships (ie 18f2550)?
I think it does support debug of that chip but i'm not sure. Generally 
the easiest way to find out what a microchip programmer/debugger 
supports is to look in mplab.

>  Will the 3?
>   
It would greatly surprise me if it didn't
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Funny NYPD | 1 Feb 03:15
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[PIC]The PICkit 2 V2.60 is now released.

Download links:

Install file:
http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit%202%20v2.60.00%20Setup%20A.zip

Install file with .Net:
http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit%202%20v2.60.00%20Setup%20dotNET%20A.zip

Here is some new features and bug fixes on V2.60 and V2.55.02:

"
-----------------------------------------------------------------
3. Release notes V2.60.00
-----------------------------------------------------------------
New Features:
-------------
> Low Voltage Programming mode support
  Low voltage programming mode (LVP) is now supported for all
  PICkit 2 supported devices which feature this option.  Refer
  to the device datasheet and programming specification for
  information on the LVP programming mode.
  LVP programming mode is enabled by the menu
  "Tools > User LVP Program Entry"
  This can only be enabled in Manual Device Select mode.  When
  enabled, the text "LVP" in red will appear above the Device
  select combo-box.
  For devices using the PGM pin in LVP mode, PICkit 2 ICSP
  connector pin 6 AUX must be connected to the device PGM pin.

  NOTE: LVP mode may only be used with devices that *already* have
(Continue reading)

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solarwind | 1 Feb 01:21
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Re: [PIC] PICKIT3 or PICKIT2 in need of a home?

On Sat, Jan 31, 2009 at 7:10 PM, Josh Koffman <joshybear <at> gmail.com> wrote:
> Um...is that what you intended to send?

LOL! Yeah. I found it funny enough :)

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solarwind | 1 Feb 03:40
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[PIC] My First PIC Development Board PCB Design

http://omploader.org/vMTcyaA

Here it is. Created with FreePCB. I did not pirate anything -.-

In the socket will fit a 28 pin DIP holder for my PIC 16F886 or 18F2620

Is it an OK design? Can anyone spot anything wrong? Are the traces too thin?

This will be for homebrew PCB making by the way (using toner transfer
and FeCl etching).

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solarwind | 1 Feb 03:42
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Re: [PIC]The PICkit 2 V2.60 is now released.

Hmm, I don't see the 2.6 release on the microchip pickit2 webpage.
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Peter | 1 Feb 04:11
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Re: [OT] ping

J FLETCHER <jfletcher427 <at> btinternet.com> writes: 
> Fascinating! My first "experience" of what sonar (sorry, I expect it's SONAR)
> sounds like was from  ...

My first impressions of echo from a whacked piece of metal came from being on a
boat anchored in a quiet place and someone working on another boat, hitting
something hard with a hammer. The echos came from a small freighter's side about
50-60 meters off. It was ping-pong alright. I suppose that the higher
frequencies get lost faster because of dispersion, the same as it happens with
light. Afaik the first gear used for submarine 'echolocation' was sound powered
phones and later amplified ones originally built for artillery fire location and
used as such in WW1.

Also afaik most modern marine sonar uses audible frequencies. The lower
frequencies go farther but the higher ones allow better directivity and higher
power with a given size of array at short distance. So it's a compromise. It is
certain that WW2 era sonar and asdic were audible to submarine crews, but I do
not know if what they heard was the pulse proper or cavitation or something else
caused by it.

Some links:

http://en.wikipedia.org/wiki/Sonar
http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
http://www.sonarshack.org/SonarMilestones.lasso (Hydrophone use in WW1)
http://science.jrank.org/pages/6289/SONAR-Historical-development-SONAR.html

(aside: this is good: http://science.jrank.org/)

Wrt uranium bar whacking, apparently the Homer Simpson character's workplace and
(Continue reading)

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Gmane