Energymeter design

[dudeshan]

hi, I'm doing Prepaid Energymeter project.
1'st step is to design energymeter.
For that Kwatt-hour is to be calculated.
What should be minimum limit of current above which time calculation should be started?
Secondly I'm using 8051 controller. I may use it's variant also.
What will be ideal clock frequency to use?
Can u tell me any basic tutorial on 8051, how to use ADC, multiplication etc..

Shantanu.

 

[vicky_raman2]

prepaid energymeter

This is for one of the posts regarding prepaid energymeter.The idea is pretty good. Well in india majority use electromechanical meter. You need not make a whole new meter and making currently used meter prepaid isnt much of a challenge. Meter constant is usually 750 i.e 750 revolutions/KWh. All we need is to count these revolutions. Now how do you go about counting these revolutions???? Well aluminium disc used has a small hole to avoid "creeping"....there you go...you can employ some circuit say a photodiode circuit(photo transistor is a better alternative)to count no. of revolutions....whenever light falls on photo transistor via this hole, current in circuit changes which can be registered in a MUP with the help of peripherals such as ADC and 8255. Data sheets are the BEST reference for the peripherals.Any further improvements and suggestions ...please DO BOTHER ME....

 

[Hero999]

https://www.electro-tech-online.com/threads/energy-meter-design.27639/?highlight=energy+meter