How to detect the peak value of sine wave using 8051 microcontroller

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rajendra_415

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hi all,
i am using 8051 in my project
 
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1. Detect the zero crossings

2. measure the period (20 ms), ie. the time between 2 positive going zero crossings

3. divide the period by 4

4. wait that time after a positive going zero crossing

5. measure the sine voltage at that point.
 

ljcox said:
1. Detect the zero crossings

2. measure the period (20 ms), ie. the time between 2 positive going zero crossings

3. divide the period by 4


4. wait that time after a positive going zero crossing

5. measure the sine voltage at that point.
Click to expand...

in circuit u need ADC also ....and interface it to the controller ..Apply the above algorithm as given by ljcox .
from the programming angle it will be easier if you make use of the interrupts external.

---------- Post added at 23:49 ---------- Previous post was at 23:31 ----------
 

ljcox said:
1. Detect the zero crossings

2. measure the period (20 ms), ie. the time between 2 positive going zero crossings

3. divide the period by 4

4. wait that time after a positive going zero crossing

5. measure the sine voltage at that point.
Click to expand...

hi thanks for u r reply
will u please give me the example code for what u said
 

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