1. Sensor specification Sensor Network Group

2. Sensor Specification Constraints of tiny sensors –Power: For survival and sensing. –Computation: Application and data aggregation strategies drive the computational requirements –Sensor: Different types of sensors like temperature, pressure, humidity, light, sound, acceleration, magnetic field etc. –Communication: Range and noise in media are the major factor.

3. Sensor Specification Our choice of sensor is SMART Dust. But, SMART Dust is not yet available in the market and not yet in a position to use for our research about Sensor Network. In this presentation, we will discuss about the alternatives available with the requirements mentioned in the last slide. Mostly it is the research done for developing Commercial of- the-shelf (COTS) Dust, which can be described as a test bed for SMART Dust for immediate unavailability of SMART Dust in market.

4. Sensor Specification Power: –Lithium Battery: Conforms to RF chip requirement of 3 v of portable power source (i.e., high energy density) Doesn’t have high current capacity. –Nickel-metal hybrid batteries: Output 260 times more than lithium. Voltage regulator require additional power to run, added noise to the system & add extra component

5. Sensor Specification Computation: –Important features of microprocessor to be choosen Power Memory size Fast re-programmability A/D channel A 3 v operating supply

6. Sensor Specification Atmel AVR AT90LS8535 Microchip PIC16F877 MC68H(R)C 908JL3 Strong Thumb AT91M404 Flash memory (k) 48 x 144 External memory Endurance 1 k 10 kN/A MIPS/mA 1.25 (min)1.66 (prelim)0.1(typical)0.6 A/D channel 8 (10 bit) 12 (8 bit)0 IAP noyes Yes Operating v 2.7-5.5v2.0-5.5v2.7-3.3v2.7-3.6v I/O pins 354023100

7. Sensor Specification Strong thumb is the processor of choice. Strong Arm is a little variation to Strong Thumb, but with all the properties compared, Strong Thumb is considered as a better fit as a processor for our Sensor Network application.

8. Sensor Specification Sensors –Two major groups: Weather monitor Motion detector –Most of them have voltage range of 2.7v-5.5v –Current consumption 600 micro-Amp other than light sensor & humidity sensors (200) –Temperature dependence is negligible for most of them.

9. Sensor Specification Communication: –Types are Acoustic RF Optical –Our choice of communication is RF. Reasons are well described in earlier presentations.

10. Sensor Specification –Available RF communications: Bluetooth RF monolithics

11. Sensor Specification Thank You