// Control the movement of a RC servo by numeric keys on MicroBoard
// Press the USER key to exit

#define PIN      19
#define KEY_USER 253

main()
{
   int    d;

   loop {
      d = getkey();                                    // wait to receive a key
      writec(0, d, 100);                               // display it on 7-Segment
      if('0' <= d && d <= '9') servo(PIN, (d-'0')*20); // calculate the angle, 0..180 degrees
      else
      if(d == KEY_USER) break;                         // exit
   }
   writes("end", 200);
   }
}