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Apparatuses and systems for reducing power consumption in remote sensing applications

  • US 5,784,004 A
  • Filed: 06/20/1995
  • Issued: 07/21/1998
  • Est. Priority Date: 12/13/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • a temperature sensor generating a sensed temperature signal;

    a pressure sensor generating a sensed pressure signal;

    a controller coupled to receive the sensed temperature signal from said temperature sensor and the sensed pressure signal from said pressure sensor, storing previous pressure and temperature data, determining change-in-pressure data based on the sensed pressure signal and the previous pressure data, determining change-in-temperature data based on the sensed temperature signal and the previous temperature data, generating extrapolated pressure data based on the previous pressure data, generating extrapolated temperature data based on the previous temperature data, determining the change-in-pressure data based on the sensed pressure signal and the extrapolated pressure data, determining the change-in-temperature data based on the sensed temperature signal and the extrapolated temperature data, generating frame data including at least one of the change-in-pressure data and the change-in-temperature data, generating a transmitter activation signal after the frame data is generated, and generating a control signal to modulate a carrier signal based on the frame data;

    a wake-up delay counter coupled to said controller, generating a count checked by said controller to determine an expiration of a sleep state, said controller controlling said apparatus to enter an operation state if the count is greater than or equal to a predetermined value;

    a wave generator generating the carrier signal;

    a modulator coupled to said wave generator, to modulate the carrier signal based on the frame data;

    a transmitter coupled to said modulator and said controller, said transmitter being activated based on the transmitter activation signal if said apparatus is in the operation state, to amplify the modulated carrier signal; and

    an antenna coupled to said transmitter, to generate an electromagnetic transmission signal based on the amplified, modulated carrier signal from said transmitter.

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