Capacitors
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Tri-stating
<videoflash>1VacYW69NMA</videoflash>
1:05
when you set a pin to input,
you want that to be a very high resistance, right? What's the input impedance of an amplifier?
PROFESSOR 2: Very high.
1:16 If you set it as an output mode, then you're driving-- what you then be looking at, really? PROFESSOR 2: Very low resistance.
1:32 PROFESSOR 2: OK, so when we're actually setting the pins, in the code,
to be inputs or outputs, we're actually changing the impedance that's the pin.
1:46 Yeah, I was connecting the supply wire to the capacitor,
pulling it off by hand.
Pulling it off by hand is like putting a really high impedance there
between those.