Wireless sensor having a variable transmission rate

摘要

A wireless sensor for measuring a light intensity is operable to transmit wireless signals using a variable transmission rate that is dependent upon the light intensity in the space. The sensor comprises a photosensitive circuit, a wireless transmitter for transmitting the wireless signals, and a controller coupled to the photosensitive circuit and the wireless transmitter. The photosensitive circuit is operable to generate a light intensity control signal in response to the light intensity. The controller transmits the wireless signals in response to the light intensity control signal using the variable transmission rate that is dependent upon an amount of change of the light intensity. In addition, the variable transmission rate may be further dependent upon a rate of change of the light intensity. The sensor may further comprise a battery for powering the photosensitive circuit, the wireless transmitter, and the controller.

主权项

1. A wireless sensor comprising:
a photosensitive circuit operable to generate a light intensity control signal in response to a light intensity; a wireless transmitter for transmitting wireless signals; and a controller coupled to the photosensitive circuit for periodically sampling the light intensity control signal to generate sampled light intensity values, the controller further coupled to the wireless transmitter for transmitting a wireless signal in response to the light intensity control signal, the wireless signal including a value representative of the light intensity; wherein the controller is configured to analyze the sampled light intensity values to determine an amount of change of the light intensity, the controller configured to transmit the wireless signals using a variable transmission rate that is dependent upon the amount of change of the light intensity.