Ground an electronic circuit

Hi, i am still new to electronic circuit design.

I am building an electronic circuit which will get energy only from a piezoelectric material.

Now in the circuit i have several points which are grounded.

How do i do those in reality in the circuit??



Also can anyone help me to get code for a pic so that i can put in the circuit to display the power outputs from the electronic circuit on an lcd display...

thanks for your help