In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Russ,
  The PWM command won't work, because a triac stays on until the AC goes to zero. So if the PWM output goes low just after the zero point, the triac will still stay on until the AC reaches zero again.

  Basically the PWM needs to monitor the AC zero crossing.

Bean.

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