naisip ko for the tilt sensor, bili ka ng rubber/plastic tubing, insert a solid wire sa loob ng tubing, this will be your reference, tapos puncture the tubing at regular intervals para pwede ka maginsert ng wires din dun, make sure na sealed yung pinagtusukan. then form the tubing into a semicircle. seal one end, lagyan mo ng kaunting mercury, then seal the other end again. may tilt sensor ka na.