You wrote via E-mail:

dear sir,
i am working on project of Microcontroller base solar inverter and
now i have a problem in calculating or measuring battery remaining charge by
using adc and 80c51 microcontroller...if u have a program than plz tell me or
you have any usefull idea than plzz tell me i m waiting.......

I don't know why you E-mailed me, as I don't help people via E-mail.

I do not have any 80C51 microcontroller code available, nor have I ever written any.

 

Dear Sir + 8051 = Indian student stuck on a school project.

 

The 80xx series of uController ICs have been out for decades. The code is universal across all platforms (8031, 8032, 8051, 8052 etc) so there are probably tons of example programs all over the place to be found through simple searching and if you can get to here you can get to Google or any of the other search engines. Sometimes if Google doesn't easily find what you want go to http://www.av.com and try there.

Even this place is often interesting: http://www.dogpile.com/dogpile/ws/r...e/iq=true/zoom=off/_iceUrlFlag=7?_IceUrl=true