James Tu wrote:
>
> I want to control a 120VAC light.  Can I use a Solid State Relay with PWM
> from a PIC?

NO, if the SSR uses 'zero crossing' activation.

Maybe, if the SSR is directly controlling the output switch (e.g. VFET).
However you MUST synchronize the PWM to the power line.
It's called 'phase control dimming'.

Most 120VAC SSRs use a Triac, so once they're on, they stay on until
the current drops below the 'hold' value (usually zero volts).

What exactly did you mean by control? On/Off is trivial.
Dimming is not that simple. For a one-off I would look for old
theatrical dimming modules that used a 0-10V control
signal.

Robert

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