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Wireless Sea Measurement Unit

Wireless Sea Measurement Unit. A Plan for Aarne Halme Project Juha Vanhalakka Erkka Mutanen. Contents. Project Specification XBee Radio Module Other Components Concept Art SWOT Analysis Seabed Mounting Arduino Environ Code Costs Project Schedule. Project Specification.

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Wireless Sea Measurement Unit

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  1. Wireless Sea Measurement Unit A Plan for AarneHalme Project JuhaVanhalakka Erkka Mutanen

  2. Contents • Project Specification • XBee Radio Module • Other Components • Concept Art • SWOT Analysis • Seabed Mounting • Arduino Environ • Code • Costs • Project Schedule

  3. Project Specification • Implement a prototype of a wireless sea measuring station for professor AarneHalme’s summer cottage • Use wireless connectivity to integrate to existing home automation system (ThereGate Linux server) • Keep things small and energy-independent but also as cheap as possible • Prototype finished in December 2013

  4. Block Diagram

  5. XBee-PRO Radio Module • Operates at 2.4 GHz ISM band (ZigBee) • 100 / 1500 m indoor/outdoor op. radius, • TX current 100-215 mA, RX current 50 mA • Link data rate 250 kbps (IEEE 802.15.4) • 5 x 10bit AD converters

  6. Measurement Circuits • Voltage splitting circuit for pressure sensor and power monitoring • Case temperaturemeasurement

  7. Measurement Circuits II • PT100 (R10) measurement done with 2 differential amplifier

  8. Power Management • Battery keeps the Sea Unit running during night time • High efficient chopper converters used

  9. Other Components Embedded Antenna (OPTIONAL) • 2.4GHz puck antenna • Fully water-proof Multicomp Solar Panel • 800 mWpolycrystal panel • Weather-proof with aluminum frames • Voltage output > radio circuit voltage

  10. CONCEPT ART

  11. Project Analysis

  12. Seabed Mounting • Many possibilities:1. Mounting near pier on dedicated pole2. Mounting on pier (measurement under quay)3. Mounting near pier on non-dedicated pole • Aluminum tube (pole) • Commercial metal shoes with spikes for underwater attaching • Not available on rock bottom • Prefer wood constructs over metal (Finnish style)

  13. Arduino Environ • Open-source physical computing platform • Microcontroller board + development environ • Based on ATMEL’s ATMega processors • Objective-C “Processing” language

  14. Code • Device pairing and routing • Radio RX/TX loop code • Sleep cycle code • Request for resend code • Measurement filtering (OPTIONAL) • Measurement pre-processing (OPTIONAL)

  15. Costs • ZigBeeXBee RF chip 40€ • Solar panels 8€ x2 • Hydrostatic pressure sensorWIKA LH-10 0€ (540€) • Resistors, switches, LEDs,optic fiber 5€ • Battery pack 5€ • Sea bed mount 60€ • Casing 40€ TOTAL costs 166€

  16. Project Schedule • Project Plan 25.09. • Progress Report 30.10.+ electronics ready, code running • Demo A 20.11.+ casing ready, code ready • Demo B 27.11.+ mounting prototype done • Documentation done 10.12.

  17. End

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