startseite - wireless sensors for the measurement of dissolved oxygen … · 2008. 9. 22. ·...
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Wireless Sensors forthe measurement of dissolved oxygen in aquaculture plants
Agenda entire System ADUM5241 O2-sensor SX8723 ATtiny2313 Comunication Example Questions End
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AgendaAgenda•• thethe entireentire systemsystem (block (block diagramdiagram))•• modulsmoduls of of thethe systemsystem
–– GalvanicGalvanic seperationseperation–– SensorsignlasSensorsignlas convertionconvertion–– TransmitingTransmiting
•• typicaltypical AplicationAplication–– ExampleExample AquacultureAquaculture plantplant
•• questionsquestions
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The entire system
Agenda entire System ADUM5241 O2-sensor SX8723 ATtiny2313 Comunication Example Questions End
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241
ADUM5241 (Analog Devics)
dual-channel digital isolatorsdc-to-dc converter integratedlow-power consumpation
6 mA (DC-to-DC Converter disabled)max. 140 mA (DC-to-DC Converter enabled)
two independent isolation channelsup to 1Mbps
origin: www.analog.com
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241RS232 RS232
sensorsignalssignal converting
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241RS232 RS232
sensorsignalssignal converting
temperatur sensorO2-sensor includes aNTC for temperaturmeasurement
O2-sensor
Analog voltagefrom 0 mV to 20 mV
O2-sensor
Temperatur sensor
Agenda entire System ADUM5241 O2-sensor SX8723 ATtiny2313 Comunication Example Questions End
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241RS232 RS232
sensorsignalssignal converting
O2-sensor
Temperatur sensor
SX8723
SX8723 (Semtech)
• Up to 16-bit differential data acquisition• Programmable gain (1/12 to 1000)• internal voltage reference• consumpation 850 µA• I²C interface
origin: www.semtech.com
Agenda entire System ADUM5241 O2-sensor SX8723 ATtiny2313 Comunication Example Questions End
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241RS232 RS232
sensorsignalssignal converting
O2-sensor
Temperatur sensor
SX8723ATtiny2313
ATtiny2313 (Atmel)
• consumpation 230 µA• internal Calibrated Oscillator• full Duplex USART• I²C-Intervace
I²C
• only two wires required• SDA (data)• SCL (clock)
• I²C speed up to 400kHz
I²C
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The entire system
measurementcommunicationGalvanicseperation
ADUM5241RS232 RS232
sensorsignalssignal converting
O2-sensor
Temperatur sensor
SX8723ATtiny2313
I²C
ZigBee(ZigBit MNZB-24-A2)
ZigBit MNZB-24-A2 (Meshnetics)
• shortrange (up to 100 m)• low-power consumpation (20 mA TX/RX)• tree, star, mesh network• High sensitivity (104 dB Link Budget)• 250 kbps On-Air Data Rate • 16 Channels (5 MHz Channel Spacing)• 16-bit Adressing
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Coordinator(Control Room)
Sensor node
Router node
AquacultureAquaculture plantplant
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Are Are therethere anyany questionsquestions youyouwantwant to to askask??
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ThanksThanks to:to:•• Dr. H. Dr. H. DispertDispert•• Dr. T. Dr. T. KnutzKnutz•• degreeddegreed engineerengineer C. C. WitthandtWitthandt
ThankThank youyou forfor youryour attentionattentionAgenda entire System ADUM5241 O2-sensor SX8723 ATtiny2313 Comunication Example Questions End