How can I control Phase angle of Triac using 8051 ?

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baileychic

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How can I control Phase angle of Triac using 8051 ?

I have successfully controlled Triac Phase angle using PIC microcontrollers but how to control phase angle of triac using 8051 series microcontrollers ?

My mains voltage is 220V 50 Hz AC.

Find the attached circuit. The ZCD is a square wave and I can detect only falling edge with 8051. So, I can only control only half cycle of AC.

Edit:

Sorry, the circuit was wrong. Here is the new circuit. Previous circuit removed.
 

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The principle is the same whatever MCU you use. Why do you say you can only detect falling edges with an 8051, they are perfectly capable of polling a logic input to find either edge.

Brian.
 

Thanks for the reply. I was able to get the code work fine.
 

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