The method to measure body's inertial mass is proposed by measuring period of vibration with the integrated hall switch sensor, when spring oscillator is in situation of simple harmonic vibration.

Phase lock oscillator, address coding and intermission mode are taken to stabilize the system and to promise the targets working period longer than 10 day.

The effects of stochastic excitation on the period-doubling bifurcation and chaotic motions of the softening Duffing oscillator, are discussed in detail.