Thanks to all the reply.
I really appreciated it. I will try it at lab.
Actually, I would like to receive A/D input from solar PV and after that there are 2 things to be done.
First, IF the A/D input is less that 2 volt then stop the motor ELSE the motor activated.
Secondly, at the same time A/D input from the solar pv is sent to the computer for processing and collected the data for every 15 minute. The result will be calculated and show in graph.
It would need some knowledge of the visual basic as database and link between vb and ms excel.

Somebody can guide me thru this?? Thank and please give advice.