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Portable personal data processing device

  • US 7,035,736 B2
  • Filed: 04/06/2004
  • Issued: 04/25/2006
  • Est. Priority Date: 04/17/2003
  • Status: Active Grant
First Claim
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1. A portable personal data processing device comprising:

  • a control unit for controlling the device;

    a user interface coupled to the control unit for giving commands to the device and obtaining feedback on operation of the device;

    a temperature sensor coupled to the control unit for measuring ambient temperature;

    a humidity sensor coupled to the control unit for measuring ambient humidity; and

    dependence information, which defines temperature values of dew points corresponding to humidity values stored in the device, the control unit being configured to monitor the change rate of the measured temperature, to determine, on the basis of the change rate, the moment at which the temperature reaches a temperature value of a dew point corresponding to the measured humidity on the basis of the dependence information, and to provide a prediction of fog appearance in relation to the moment employing the user interface, the control unit being configured to show the time left until the predicted fog appearance in the user interface.

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