Hello,I would like to implement an AC Voltmeter using PIC16F877A but I don`t know where to start by,I tried to look everywhere on the net but the project I found is totally wrong as I implemented the same and I don`t get any good measurement. http://microcontrollerslab.com/ac-voltage-measurement-using-microcontroller/.

Even in Proteus it does n`t give good output.

Please help

 

Did you build the hardware or just simulate it?
Did you try the version with resistors or with a transformer?
What readings did you get, and what did you expect?

 

I build the circuit,http://www.edaboard.com/thread355077.html#post1519067 for DC voltage and current reading I am using the resistors and operation amplifier which amplify the small value I get (especially for current measurement),for AC voltage measurement I used a transformer for not burning my circuit so that I can measure the AC Voltage output from the transformer but I am not succeeding to any of those circuit,for frequency I have been advised to use the T1CKI input of the PIC but its my first time to use its to difficult for me to code for it.
Find my the codes I used below,I found different circuits on the internet but they all not work not giving me the right values.

I refered to the following links but they owner did not provide right codes for the operation:

1.for AC Voltage reading http://microcontrollerslab.com/ac-voltage-measurement-using-microcontroller/
2.DC voltage measurement :https://electrosome.com/voltmeter-ammeter-pic/
3.Frequency :https://mlabsbd.wordpress.com/2014/...ers-with-micro-controller_final-year-project/

Unfortunately the codes I took from those above showed link don`t work anymore.

Please help me to think and find good solution for my project!!

 

Which one do you have built in front of you at the moment?
We'll try to get that one working.

 

I do have all of them but the third one is very wonderful for AC measurement and also the second one for DC Voltage and DC current measurement.

Best Regards,

 

It's wonderful but it doesn't work???

 

yeah,no one working between all of those!!

Please help

 

I am not psychic - I need you to tell me the details of what circuit you are using and what input you applied and what output you got to have any chance of making helpful suggestions. Pick one of the circuits (we can't do three at once) and tell me about it.

 

Hello,find on this link the circuit I am using,https://mlabsbd.wordpress.com/2014/...ers-with-micro-controller_final-year-project/

 

Hello,find on this link the circuit I am using,https://mlabsbd.wordpress.com/2014/...ers-with-micro-controller_final-year-project/

OK, so you're using that same hardware and you copied the software from that project too.
What results did you get?

 

I get different values which are not the same with what I think I have to get,the input of the transformer is 220VAC/50hz I think that on the LCD I have to get that 220VAC or nearby,but I am getting,2V,3V,13V,68V,75V,72V and much more different values so I ask myself which one take and consider it as the output measured voltage and how to get only one value among different obtained so only one or at least two values near 220V be printed on the screen,

I used the same circuit but the PIC I am using is PIC16F877A at 12MHZ and the input is at RA3.

Please help,best Regards,

 

So in that case you need to change the software to match. Please post your revised software.