every pic tutorial has a lesson about using pwm to vary the intensity of a=
=20
led, but i couldn't find something that explained how it works in theory.=
=20
Recently someone has posted a message suggesting to use pwm to get an analo=
g=20
voltage. How does that work? Let's say i send a square wave to resistor-led=
,=20
does the intensity of light depend on the duty cycle of the wave? And if=20
yes, is it just for an optical effect, or there is some electrical law=20
behind it? in the latter case, what would be a general method to obtain an=
=20
analog voltage through it? i know they are very stupid questions, sorry for=
=20
that and thank you in advance for any enlightening answer :)
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