| 摘要 |
Method for communication between an electronic module and a sensor having a first branch, including a light source LED and a first switch, and a second branch including a second switch, supplied by a supply line, the module measuring modulations of intensity of current of the line. When the light source is turned on or in the process of turning on/turning off, the sensor causes i) modulation of the intensity of the current in the LED between a high state and a low state, ii) modulation of the intensity of the current in the second branch so that the intensity of the current is always in a higher state, and, in case of detection, iii) dispatches to the electronic module a modulation of the intensity of current in the second branch, when the intensity of current in the LED is in the low state. |
| 主权项 |
1. A method for communication between an electronic module (100) and a detection sensor (200), the electronic module (100) being connected to the detection sensor (200) via a supply line (W10), the electronic module (100) comprising a microcontroller (110) and a voltage source (VBAT) connected to the supply line (W10), the detection sensor (200) comprising a microcontroller (220), a circuit comprising a first branch (B1) connected in parallel with a second branch (B2), each of the first and second branches (B1, B2) being connected to said microcontroller of the detection sensor via a switch (S20, S10), the detection sensor (200) comprising, on the first branch (B1), an actuator (LED10), said first and second branches (B1, B2) being supplied with current flowing on the supply line (W10) connected to the voltage source (VBAT), said electronic module (100) being configured for measuring modulations of intensity of the current flowing on said supply line (W10) between a lower state and a higher state, wherein the detection sensor (200) controls the actuator (LED10) by modulating the intensity of current flowing in said actuator by the steps of:
having the actuator (LED10) be in a first position when the intensity of the current flowing in the actuator (LED10) is in the low state, placing the actuator (LED10) in a second position when the intensity of the current flowing in the actuator (LED10) evolves between the low state and the high state, wherein the actuator (LED10) evolves between the low state and the high state based on a control signal with a constant duty ratio of X %, X being strictly less than 100, wherein, when the actuator (LED10) is in the second position, the intensity of current flowing in the second branch (B2) is defined so as to be complementary to the intensity of current flowing in the first branch (B1) in such a way that the intensity of current flowing in the supply line (W10) is maintained in the higher state, when a predefined event (D) is detected by the detection sensor (200) and i) the actuator (LED10) is in the first position, and ii) the intensity of current flowing on the supply line (W10) is in the lower state, the microcontroller (220) of said detection sensor (200) notifies the microcontroller (110) of the electronic module (100) with an information item according to which the predefined event (D) has been detected, in the form of a predefined modulation of the intensity of current flowing in the supply line (W10) with respect to the lower state, and when the predefined event (D) is detected by the detection sensor (200) and the actuator (LED10) is in the second position, the microcontroller (220) of said detection sensor (200) notifies the microcontroller (110) of the electronic module (100) with an information item according to which the predefined event (D) has been detected, in the form of a predefined modulation of the intensity of current flowing in the supply line (W10) with respect to the higher state, solely when the intensity of current flowing in the actuator (LED10) is in the low state. |
