Re: [PIC] Repairing 12F675 Calibration Memory

> As far as I know the PS+ should be able to program the osccal

You'd think it could but AFAICT it can't. In all the threads, help
and Microchip tickets I found no mention is made of PS+. That's
not to say no mention is proof

The PS+ / MPLAB respond quite differently to a 675 with erased
OSCCAL and a "normal" 675. The normal 675 produces both the
Configuration Warning and Calibration Memory Not Programmed
messages, the erased PIC produces neither, no matter what you
instruct the PS+ to do (so far)

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Re[2]: [PIC] pro and contra: reset switch

Yes. I am thinking about a way to make sure that there won't be a 1
for a 0 and vv.. I think about using a cylinder and placing the LDR on
the one side and a lightsource at the other one. Then we need some way
to interrupt the beam effortlessly.

> I went through the same train of thought recently.  Light-sensitive
> pushbuttons are definitely cool.  Ended up using pushbuttons,
> though.  Rationale: If there is any chance of a false positive or
> false negative, the classiness of the no-contact approach isn't so
> classy. --  Timothy J. Weber http://timothyweber.org

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Re[2]: [PIC] pro and contra: reset switch

What is a pt's advantage compared with a LDR in the surrounding of my
pros and cons ?

> Why you don´t use a phototransistor instead of a LDR?

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Re:[PIC] pro and contra: reset switch

> Yes. I am thinking about a way to make sure that there won't be
> a 1 for a 0 and vv

Modulating the light source (PWM module or separate oscillator)
would help, with a band-pass filter on the sensor output. I tried one
of those reflective IR sensors once as a "touch" button, worked OK
but went with something else in the end

Like this (238kB)

http://www.optekinc.com/pdf/OPB740.pdf

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Re: [PIC] pro and contra: reset switch

Thilo Klein wrote:
> Yes. I am thinking about a way to make sure that there won't be a 1
> for a 0 and vv.. I think about using a cylinder and placing the LDR on
> the one side and a lightsource at the other one. Then we need some way
> to interrupt the beam effortlessly.

[and Jinx's suggestion of modulation definitely helps, IME] But it's 
always going to be a question of thresholds.  How much shadow is a 
button press, and how much is a person walking between an outside light 
source and the device?  How fast a change is a button press, and how 
fast is a hand-wave?  Was that a button press, or someone picking the 
unit up?

That's assuming a flat surface with the optical components under it.  If 
you really can allow a black tube with a light source at one end and a 
sensor at the other, and require the user to stick a finger in the 
middle, that's great, but... it may not meet the user's expectations or 
usability criteria, especially compared to a plain old button.

What are the main criteria that attract you to the optical button? 
Cost, lifespan, environmental insulation, cool factor?
-- 
Timothy J. Weber
http://timothyweber.org
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Re: [OT]:: Teamspeak - any Skype type tendencies

Russell McMahon wrote:
> My son, who lives about 400 miles away, has suggested that I install 
> "teamspeak" to allow Internet VoIP communications.
>
>         http://www.goteamspeak.com/
>
> It looks good*, BUT has it got wany of the nasty habits of Skype or is 
> it a good citizen?
>
>
>
>         Russell.
>
> * Actually, it looks utterly fantastic. I'd be most interested in 
> using it in a number of roles if it is free of Skype type hidden 
> nasties.
>
>   
I haven't heard anything too nasty about it. (Actually haven't heard
anything bad about it)
Have you looked at just rolling your own VoIP though?
Heck if you wanted to you could both just use MSN to talk (though I
suspect thats out for other reasons ;->). There are VMware based VoIP
servers out there that you can just drop on a box and have a full PABX
if thats your desire. Or you could use ekiga or some other such, open a
port or 2 and have direct VoIP with no servers at all. If your internet
connections are up to it you can get better than landline quality calling.

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Re: [EE] temperature components advice request

This first project is a bit too tough...... Anyway we
are here to help :)

John

--- Jinx <joecolquitt <at> clear.net.nz> wrote:

>  > Can someone advise me as to how to look up these
> parts?
> 
> Hi Edmund
> 
> Phew. You've picked a challenge to start electronics
> with
> 
> I'd like to give you a reference at Maxim's site but
> they appear to
> be closed
> 
> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3021
> 
> This will at least show you how the DS1820 is
> connected
> 
> http://www.embedtronics.com/demotemp/demotemp.html
> 
> I'd suggest you not bother with the 12C508 unless
> it's programmed.
> It's a one-time programmable device. Get it wrong
> and that's about

Re: [EE] temperature components advice request

Vasile,

   Where do you get stuff at a reasonable price?

Thanks
John

--- Vasile Surducan <piclist9 <at> gmail.com> wrote:

> On 5/31/07, cc <cc <at> belfordhk.com> wrote:
> 
> > I managed to google a temperature sensor/data
> logger and
> > I do have the parts list and I have a Digi-key
> catalog(2005).
> > [Got this list from http://quozl.netrek.org/ts/]
> 
> If you live in the US, then Digikey is an universal
> (and veeeery
> expensive) panacea.
> 
> take a  look here too:
> http://surducan.netfirms.com/module.html
> and documentation:
>
http://www.geocities.com/vsurducan/module/smallsmart_eng_03.pdf
> 
> This could be perfect for playing with a PIC looking
> how frogs are
> spitting when you press the button.

Re: [EE] temperature components advice request

wouter van ooijen wrote::
>> (once I find a decent
>> book - any suggestions?).
> 
> If you are up to it: "the art of electronics"

I'll try to find it.

>>
>> Can someone advise me as to how to look up these parts?
> 
> "look" or "hook"?

Look as in look up in the catalog.  My error.

> 
> Kitsrus has a kit that contains all of the above, with the chip
> programmed. I (and others) sell these kits:
> http://www.voti.nl/shop/p/K-DIY-145.html

Yeah.  Will have to look up the retailers here in HK.

> 
>> (In the case that it hasn't been 
>> pre-programmed, should i find the pre-programmed one or the 
>> 'empty' and program it myself using a programmer?)
> 
> If you just want to build just this one temperature thingy you should
> buy a preprogrammed chip, or preferrrably the kit.

[EE]: PC power supply "Mini-Plug" part number

Hi all,
I have been searching for hours for the part number of  the floppy drive 
power plug and its pcb mating to no avail.
Would anyone happen to know who makes those or who sells them?
Thanks
Gaston Gagnon

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