hi people,
let say I have a device D0 I want to
monitor the clock and data signals.
The device is powered by a 5v/10Ma
current source I have no access to
(except to power D0 of course)
To monitor the signals, I plan to use
a pic microcontroller. Let call it
D1. I will have to power it with
another current source.
Let say the D0 signal frequencies are
far below the one the pic can handle,
so no problem for that point.
My question: since the ground is not
the same in the 2 cases (cannot power
D0 and D1 from the same source), how
can I measure a D0 voltage from D1?
Am I misleading?
The question may be basic, but I dont
have any clue... was thinking about
something like a relay, but it would
not be possible due to relatively high
freqs...
Thanks for answering,
Regards,