at first we we was missed the method that will connect the wires of the solar cells ( the source of the electricity) with the Aluminum sheets of the electrostatic percipitators after detecting the presence of the dusts. But after thinking we found that it is easy to use the circuit of the switch of the lamp in our homes to have the same rule in our project, as when we click on it thr circuit between the solar cells and the aluminium sheets will be closed to conduct electric current and charge the aluminum sheets