TF sensor get always the same value



  • Hi folks

    I have a program that reads the TF sensor every second.
    After 1 or 2 weeks, the sensor suddenly only delivers the same constant value (last value read from it).
    I have to restart the whole device and then the sensor does read out correct current values again for 1 or 2 weeks.

    example (values only to visualize with some fault measurement like in real):
    99.7, 99.6, 99.7, 98.9, 98.8, 98.5, 98.3, 98.4, 98.3, 97.9, 97.6, 97.2, 97.3, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7, 96.7

    Does anyone know the problem?

    Best regards
    Thomas



  • New findings:
    The TF-sensor readings "hangs" exactly after 13 days.
    After that always the same value is given out.
    This behavior was occured every 13 days in the last 5 months.
    Very strange.
    What could that be?