Camping in Spain, any ideas?

Me and my girlfriend are planning a camping holiday in spain. We are driving from malaga to barcelona over two weeks. We are taking a tent. We plan to slowly make our way to barcelona spending time on a the coast and inland, All the campsites i seem to find online are the big holiday camp style sites. Does anyone know, or know where i can get info on finding smaller\cheaper campsites? im sure there are plenty of little gems out there, any help would be fantastic. Muchas Gracias