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Heh, I don't have any earth in this appartment. If I touch my PC chassis 
when it's on, and I don't have shoes on, wow do I get a shock...

Justin.

Mauricio Giovagnini wrote:

> Alan, this is an electric problem not a PIC problem.
> In my point of you ... if don't reference grounds... anything could 
> happen...
> You will have awfull noise
> You can have ANY voltage on the pin because the grounds are not 
> joined... you could even have negative voltages.
> I think its a bad idea to do that, you could even have hundreds of 
> volts...
> Its like connecting to PCs without a good grounding... the voltage 
> between both chassis can be 90Vcc!!  And im talking about the chassis 
> that should be '0' ... hhehehe  (i repeat without grounding)
>
> May be you could do some electronic circuit with an optocoupler, they 
> are good to 'isolate' DC circuits...
> The current will be proportional to the voltage...
>
> alan smith wrote:
>
>> I have a design where I have a 48V input that I
>> monitor with the PIC, but the ground for this is
>> isolated from the rest of the circuit.  The 48V goes
>> thru a resistor divider to be in the range of the PIC
>> (100:1) and I just need to know if its within a range,
>> not looking for accuracy.  So, since the source is
>> isolated from the ground that the other resistor is
>> tied to, will I see any problems, or better to tie the
>> divider across the 48V and the isolated ground?
>>
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>
>
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