Very Urgent ( control motor speed)

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Hassan Gazal

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Dear all ,

please i need to use 8051 controller to control ac motor speed , i read about it using triac and change firing angle , but i can't build it

so if any one please give me the code in assembly or c and the schematic diagram

thanks
 

use moc3021 to isolate triac and 8051.. use second normal opto isolator to detect zero voltage condition...
moc is must you can not connect triac directly to micro...

in 8051 you can use ext interrupt from opto iso.. when it comes send a predefined pulse to moc and wait for next interrupt..
 

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