void drawGraph() {
    String out = "";         //  start with a clean sheet
  int y2;
    char temp[100];
     out += "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"1000\" height=\"800\">\n";
     out += "<g stroke=\"black\">\n";                                                       // create the graphics arena

     out += "<circle cx=\"150\" cy=\"150\" r=\"100\"  fill=\"rgb(160,160,250)\" />\n";  // the blue sun
 
  int y = 5;
     for (int x = 10; x < 990; x+= 10) {

          y2 = analogRead(A0);     //  the Oscope analog  , quite boring actually
 
         sprintf(temp, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke-width=\"3\" />\n", x, 500 - y, x + 10, 500 - y2);
         out += temp;                             // and set up SVG graphic in buffer
         y = y2;
     }

    out += "</g>\n</svg>\n";                 // before presenting the SVG graphic to the world.

    server.send ( 200, "image/svg+xml", out);
}