I know I'm a few years late on this, but
HOLY SHIT BATTLESTAR GALACTICA IS SO GOOD.
Things are still really mathy over here, if you were wondering. Taking three high level statistics courses at once was a really good idea because I get to see three different iterations of the same concepts over and over again. Makes it easier to digest. Number theory is a lot easier than I was expecting. That's about all I have going on right now. How you doin?
HOLY SHIT BATTLESTAR GALACTICA IS SO GOOD.
Things are still really mathy over here, if you were wondering. Taking three high level statistics courses at once was a really good idea because I get to see three different iterations of the same concepts over and over again. Makes it easier to digest. Number theory is a lot easier than I was expecting. That's about all I have going on right now. How you doin?
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You basically have a grid on the bottom side of the keyboard (if you took it apart) like this:
(ignore the red circles, this is just for example, stolen from the web)
The key matrix is a complete circuit. So the circuit itself is always closed, so there is voltage (tiny amounts) constantly running through your keyboard.
When you press a key, you reduce the capacitance of the circuit under that key and the processor in the keyboard detects the change in capacitance and identifies the key and/or keys.
Old school keyboards used to use the close/open a circuit identifier, but they went the way of the Yugo years ago.