| 摘要 |
Method of searching for a variation in capacitance of a capacitive sensor, includes a phase of searching for variation in capacitance and, when a capacitance variation has been detected, a phase of verifying the variation in capacitance. The search phase includes a recurrent step of searching for variation in capacitance including steps of measuring the duration of a first measurement sequence and determining, according to the measured duration, whether a first predefined detection criterion for variation in capacitance is verified. The verification phase includes steps of measuring the duration of a second measurement sequence and determining, according to the measured duration, whether a second predefined detection criterion for variation in capacitance is verified. The first measurement sequence has a reference duration less than that of the second measurement sequence, and the verification phase includes, when the second detection criterion is not verified, a step of updating the first detection criterion. |
| 主权项 |
1. A method (10) for searching a capacitance variation of a capacitive sensor, said method comprising a phase (12) of searching for a variation in capacitance and, when a variation in capacitance has been detected, a phase (14) of verifying the variation in capacitance, the search phase (12) comprising a recurrent step (120) of searching for a variation in capacitance comprising steps (122) of measuring the duration of a first predefined sequence of charges/discharges of said capacitive sensor, known as the ‘first measurement sequence’, and (124) of determining, according to the measured duration, whether a first predefined detection criterion for a variation in capacitance is verified, the verification phase (14) comprising steps (140) of measuring the duration of a second predefined sequence of charges/discharges of said capacitive sensor, known as the ‘second measurement sequence’, and (142) of determining, according to the measured duration, whether a second predefined detection criterion for a variation in capacitance is verified, characterized in that the first measurement sequence is, in the absence of variation in capacitance, of a duration, known as the ‘reference duration’, less than the reference duration of the second measurement sequence, and in that the verification phase comprises, when the second detection criterion is not verified, a step (144) of updating the first detection criterion. |
