Understanding Smart Sensors - Nomads.usp

324 Understanding Smart SensorsA/DrefB.G.refvoltage−+−+−+−+Resistorcontrol88HC05B.G.refcurrent−+−+x4temperaturesensorOSCWatchdog10-bitA/D8-bitD/A88888888RAM128 byteBOOTROMEPROM2K byteSPIFigure 14.6 Block diagram of monolithic MCU-pressure combination.smoke/chemical detector. Rather than sound an audible alarm, the sensorwould send a wireless signal to a remote receiver/interpreting device in the vehicle.The signal would be received by an RF backbone with an appropriate protocolto recognize the particular sensor from other RF signals that could betransmitted in the vehicle.The (wireless) sensory capability could be expanded to other defensemechanisms to detect and react to other harmful or undesirable occurrences inthe vehicle. For example, the driver or a passenger could wear a sensing systemthat transmits the driver’s physical state. People with potentially debilitatingconditions, such as heart condition, epilepsy, or diabetes, would be prime targetsfor such sensing systems, adding to the total number of RF sensing nodesin the vehicle.14.4.8 Personal ID Smart SensorSecurity is driving several approaches for automated personal identification[19]. The digital access of information and the ability to make transactions over