> I am building a light dimmer

Not side-stepping the aim, but is there a noticeable 1-bit
difference in intensity, particularly if the load is something
with inertia, like a filament bulb ?

As with a motor, you might find you have a useless band at
the lower end where there's not enough energy to rotate with
meaningful torque or illuminate, just produce heat. Usefulness
may start at 20% or even 30% duty cycle, so you don't need
the whole ADC range and can reserve the lowest results (eg
a few degrees) for 'off', and the same at the top end for 'on'

Joe


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