Device for automatically detecting coupling between electronic devices

1. A method for automatically detecting a sensor coupled to an electronic computer, the method comprising:

a first step e 1 ), consisting in switching a transistor in order, on the one hand, to short a first resistor and, on the other hand, to apply, between a first computer pin and a second computer pin, an impedance of the order of a second resistor,

a second step e 2 ), consisting in reading a signal generated by said sensor coupled to the computer,

a third step e 3 ), consisting in comparing the value of the signal generated by the sensor coupled to the computer with a reference value,

in the event that the result of the comparison in the third step e 3 ) is positive, performing:

a fourth step e 4 ), consisting in configuring a hardware interface in voltage-source sensor mode, and in controlling the transistor in open-circuit mode, wherein the first resistor is no longer shorted by the transistor,

a sixth step e 6 ), consisting in a software configuration of the hardware interface which is suitable for allowing the signals delivered by the voltage-source sensor to be read,

a seventh step e 7 ), consisting in monitoring and in detecting information that a starter of a vehicle has been controlled,

an eighth step e 8 ), consisting in checking the presence and the correct operation of the voltage-source sensor coupled between the first computer pin and the second computer pin,

in the event that a frequency variation in the signal delivered by the voltage-source sensor is detected, performing a ninth step e 9 ), which is representative of the correct operation of the voltage-source sensor, consisting in confirming said presence and said correct operation of the voltage-source sensor across the terminals of the computer,

in the event that a frequency variation in the signal delivered by the voltage-source sensor is not detected, performing:

a tenth step e 10 ), which is representative of a potential anomaly of the sensor, consisting in switching the transistor in short-circuit mode, to short the first resistor and to position the hardware interface in a software configuration mode for a current-source sensor, configuring the hardware interface in current-source sensor mode,

an eleventh step e 11 ), consisting in a software configuration of the hardware interface which is suitable for allowing the signals delivered by the current-source sensor to be read,

a twelfth step e 12 ), consisting in checking the presence and the correct operation of the current-source sensor coupled between the first computer pin and the second computer pin,

in the event that a frequency variation in the signal delivered by the current-source is detected, performing a thirteenth step e 13 ), which is representative of the correct operation of the current-source sensor, consisting in confirming said presence and said correct operation of the current-source sensor across the terminals of the computer, and

in the event that a frequency variation in the signal delivered by the current-source is not detected, performing a fourteenth step e 14 ), which is representative of the presence of an anomaly, consisting in confirming an anomaly at the level of the sensor coupled to the computer,

in the event that the result of the comparison in the third step e 3 ) is negative, performing:

a fifth step e 5 ), which is representative of a negative comparison result in step e 3 , consisting in configuring the hardware interface in current-source sensor mode, and in a software configuration of the hardware interface in order to allow the signals delivered by the current-source sensor to be read,

a fifteenth step e 15 ), consisting in repeatedly monitoring and detecting information that the starter of the vehicle has been controlled, and

a sixteenth step e 16 ), consisting in checking the presence and the correct operation of the current-source sensor coupled between the first computer pin and the second computer pin,

in the event that a frequency variation in the signal delivered by the current-source is detected, performing a seventeenth step e 17 ), which is representative of the correct operation of the current-source sensor, consisting in confirming said presence and said correct operation of the current-source sensor across the terminals of the computer,

in the event that a frequency variation in the signal delivered by the current-source is not detected, performing an eighteenth step e 18 ), which is representative of the presence of an anomaly and consists in confirming an anomaly at the level of the current-source sensor coupled to the computer.