Might want to take a look at www.sparkfun.com at their inertial measuring devices ready to go. Solid state gyros and solid state accelerometers. Should be able to brew something interesting from them. HTH Vic ___________________________________________________ Vic Fraenckel KC2GUI victorf AT windreader DOT com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist