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Hey guys,
Lately I have been running a few projects that are using a car=20
battery as an energy source.
I need to introduce some picmicro controlling power to these projects.

I am looking for a way to operate the picmicro on 12V battery=20
environment.
In some cases I need only logic level (go, no-go) and in some cases I=20
need to have a full dynamic range conversion (0-12V into 0-5V or vise=20
versa=85)( no idea how to achieve this goal).
I am wondering what is the best way to go about these requirements.
Any ideas and help will be much appreciated.

Thanks in advance,=20
Liquias.

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7805 to regulate 12v to 5v to power PIC.
Big capacitor to take out spikes.
0-12v to 0-5v -- voltage divider.
Tougher to go the other way.

At 03:47 PM 9/26/2008, you wrote:
>Hey guys,
>Lately I have been running a few projects that are using a car
>battery as an energy source.
>I need to introduce some picmicro controlling power to these projects.
>
>I am looking for a way to operate the picmicro on 12V battery
>environment.
>In some cases I need only logic level (go, no-go) and in some cases I
>need to have a full dynamic range conversion (0-12V into 0-5V or vise
>versa…)( no idea how to achieve this goal).
>I am wondering what is the best way to go about these requirements.
>Any ideas and help will be much appreciated.
>
>Thanks in advance,
>Liquias.
>------------------------------------
>
>to unsubscribe, go to http://www.yahoogroups.com and follow the
>instructionsYahoo! Groups Links
>



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Thank you !

I thought of using the 78L05, and the voltage divider (which means I
need to have one voltage regulator for each pin I want to connect), but
I was thinking more along the lines of having some solution for a whole
port at once. soem solution for haveing multiple inputs/outputs able to
communicate at once...

again thanks for trying to help -
Liquias.

------------------------------------

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Not sure what you mean here, Liquias. Regulators like the 78L05 are usually just for the Vdd supply. I don't see how they apply to signals.

dB

----- Original Message -----
From: liquias
To: p...@yahoogroups.com
Sent: Sunday, September 28, 2008 6:52 AM
Subject: [piclist] Re: Voltage conversions
Thank you !

I thought of using the 78L05, and the voltage divider (which means I
need to have one voltage regulator for each pin I want to connect), but
I was thinking more along the lines of having some solution for a whole
port at once. soem solution for haveing multiple inputs/outputs able to
communicate at once...

again thanks for trying to help -
Liquias.

------------------------------------------------------------------------------
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Most IC houses like Maxim and Analog Devices have various forms of level
translators for precisely these cases.

Jan Didden
j...@gmail.com
+31 6 4188 3684

_____

From: p...@yahoogroups.com [mailto:p...@yahoogroups.com] On Behalf Of
liquias
Sent: Sunday, September 28, 2008 7:52 AM
To: p...@yahoogroups.com
Subject: [piclist] Re: Voltage conversions

Thank you !

I thought of using the 78L05, and the voltage divider (which means I
need to have one voltage regulator for each pin I want to connect), but
I was thinking more along the lines of having some solution for a whole
port at once. soem solution for haveing multiple inputs/outputs able to
communicate at once...

again thanks for trying to help -
Liquias.



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What are you trying to do, here ? Switch something with the pins of
the MCU ?
Can you be more specific ?
The 78L05 regulates from a higher power min. 3 volts more than on the
output expected.
But if you want to switch use a transistor or better a FET for every
pin you have something connected to.

Csaba
On Sep 28, 2008, at 7:52 AM, liquias wrote:

> Thank you !
>
> I thought of using the 78L05, and the voltage divider (which means I
> need to have one voltage regulator for each pin I want to connect),
> but
> I was thinking more along the lines of having some solution for a
> whole
> port at once. soem solution for haveing multiple inputs/outputs able
> to
> communicate at once...
>
> again thanks for trying to help -
> Liquias.
>


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