The usual way is a 'see-saw' device, which tips backwards and forwards as the rain fills it, generating a pulse each time. The main problems are mechanical, not electronic really.jerfude said:i think we need around 15 to 20 levels. and this is to be interfaced in
the PC. we already have a circuit for the PC interfacing, so i guess
we need a circuit that gives an output voltage relative to the rain level.
thank you guys for the reply..