client.print("<h4><a href='/?D=1'>DESTRA</a></h4>");
client.print("<h4><a href='/?E=1'>ENTRAMBE</a></h4>");
client.print("<h4><a href='/?S=1'>SINISTRA</a></h4>");
client.print("<input type=\"button\" style=\"width:120px; height:80px\" value=\"Aggiorna\" onclick =\" location.href='/'\">");
// chiudo il div
client.println("</div>");