Learning proximity detector

摘要

The present invention relates to a self-adaptable proximity detector delivering a binary output signal (23) for the presence or absence of a target (19). The detector (10) includes a processing unit (15) and operates according to a short learning mode (AC) for an adjustment relative to its environment, according to a long learning mode (AL) for an adjustment relative to its environment and to a target (19), and according to a working mode corresponding to normal operation. The detector (10) comprises a variable digital storage resistor (14) driven by the processing unit in the learning mode and connected to the detection stage (12) so that variation of the value (R) of the digital resistor causes a variation of the switching threshold (SC) In the working mode, the processing unit (15) is in a standby state and the digital resistor (14) remains at its set operating value (RF)