[time-nuts] webcam app to watch for and time stamp changes

Magnus Danielson magnus at rubidium.dyndns.org
Sat Mar 2 19:12:29 EST 2013

On 03/03/2013 01:00 AM, Peter Gottlieb wrote:
> Perhaps you can detect EMI from the device especially if you put it it a
> shielded metal box with pickup antenna. You might be able to get the
> clock right from that.

Well, considering that actively "driving" a LCD segment involves passing 
an AC field over it, in electrostatic drive, you could detect the 
existence of AC or not on a segment, but you would have to "mask out" 
that of other segments. On the other hand, you can expect a multiplexed 
drive. An E-field detector as such would be able to pick up the shifts. 
Wonders if the multiplexing is done by the same clock or a free-running 
clock. If it is the same clock, just picking up the E-field from the 
multiplex suffice to detect the clock ticking.


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