IMPLEMENTATION OF AN ENERGY EFFICIENT WIRELESS SMART SENSOR
[attachment=16055]

DESIGN GUIDELINES


.How to design an efficient power supply?
.How to estimate sensor life?
. Which sensor to estimate a physical quantity?
.It exists the “best microcontroller”?


Batteries tested

-Rechargeable 1.2V 2.3Ah NiMH battery NH15 by Energizer (BATR)
-Alkaline 1.5V 2.85Ah Zn/MnO2 E91 by Energizer (BAT1)
- Alkaline 1.5V 2.85Ah Zn/MnO2 MN1500 by Duracell (BAT2)


Discharge mode

-Constant resistive load: constant resistive load (R = 40Ω)

-Pulsating load: 500ms with a constant resistive load (R = 20Ω), 500ms without load (period T = 1 s and duty cycle D = 50%)

-Constant current mode: load requires always the same current (50,25 mA)

Future evolutions:
-Sensors: system on Chip (i.e. microcontroller with transceiver)

-Power supply systems: low power real time clock and low quiescient current, high efficiency LDO, charge pump and step up.