Electronic member transmitting an item of identification information during a state change

An electronic member incorporated in a mounted assembly, the electronic member comprising:

• at least one movement sensor, a signal of which is sensitive to movement of the electronic member, or at least one proximity sensor, a signal of which is sensitive to a distance of the at least one proximity sensor from an object outside the electronic member;
• a microprocessor coupled to the at least one movement sensor or to the at least one proximity sensor to create a data signal;
• a storage area connected to the microprocessor for storing at least one part of a data signal representative of the at least one movement sensor or the at least one proximity sensor and at least one identification information element;
• an energy source;
• and
• a radio transmitter connected to the microprocessor,
• wherein the microprocessor defines at least two states of the electronic member based on the at least one part of the data signal,
• wherein the storage area contains at least one predetermined change of state which is defined on a basis of the at least two states of the electronic member, the predetermined change in state indicated by at least one of:
• (1) a change of a rotation speed of the mounted assembly above or below a threshold value for the rotation speed, wherein the threshold value for the rotation speed does not indicate a change in state of the electronic member if only a single crossing of the threshold value is observed;
• (2) a change in a periodic radial acceleration above a critical acceleration, the periodic radial acceleration corresponding to a rotation velocity of the mounted assembly, wherein the data signal has an acceleration part, and an amplitude of the acceleration part is a function of the rotation velocity;
• (3) a change in distance corresponding to the electronic member crossing a critical length threshold for a critical length, the critical length being between the electronic member and the object;
• and
• (4) a change in velocity of the mounted assembly above a critical velocity, the change in velocity represented by an amplitude of an accelerometer first being below a curve corresponding to the critical velocity and then upwardly crossing the curve corresponding to the critical velocity,
• wherein the microprocessor, after detecting the at least one predetermined change of state of the electronic member, causes the radio transmitter to transmit the at least one identification information element via a radiofrequency signal transmitted during a time interval ΔT beginning after detecting the at least one predetermined change of state of the electronic member, and stops transmission of the radiofrequency signal at an end of the time interval ΔT, the time interval ΔT of the transmission of the radiofrequency signal ending after between 20 seconds and 10 minutes, and
• wherein the radiofrequency signal has a transmission frequency of between 2400 and 2482 MHz.