04-05-2012, 12:51 PM
VSIB: A Sensor Bus Architecture for Smart-Sensor Network
seminar report 2.doc (Size: 379.5 KB / Downloads: 25)
. INTRODUCTION
A sensor network is a collection of nodes that collect data
about their environment. In addition to data acquisition
nodes, a sensor network may have actuator or output nodes
that can be used to manipulate the surrounding environment
based on data collected by the sensor nodes. Sensor networks
typically span a small physical area, with nodes dispersed
throughout. A smart sensor network addresses many of the
problems associated with sensor networks. There is an
increasing amount of sensors with signal-processing
capabilities due to the rapidly improving silicon technology.
These are known as smart-sensors. A system consisting of
smart sensors generally includes a direct connection of
different kinds of physical sensors, and sensor interfaces to a
microcontroller, a digital signal processor (DSP) or a
computer with a data communication protocol.
SERIAL PERIPHERAL INTERFACE
Serial peripheral interface (SPI) is a three wire serial bus for 8 -bit data communication application. Two of the three lines transfer data and the third is a serial clock. Similar to I2C bus, devices on the bus are defined as masters and slaves. A master initiates an information transfer and generates the clock.
UART
A Universal Asynchronous Receiver and Transmitter (UART) is used for communication with serial input/output devices. Typically, the UART is connected between a central processor and a serial device. To the processor, the UART appears as an 8-bit parallel port, which can be written to or read from. To the serial devices, the UART presents two data wires, one for input and one for output, which serially communicate 8-bit data. The rate of data communication depends on the peripheral device [5].