13-01-2012, 12:39 PM
IMPLEMENTATION OF AN ENERGY EFFICIENT WIRELESS SMART SENSOR
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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.