1. Wireless Sea Measurement Unit A Plan for Aarne Halme Project Juha Vanhalakka Erkka Mutanen

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

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

4. Block Diagram

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

6. Measurement Circuits O Voltage splitting circuit for pressure sensor and power monitoring O Case temperature measurement

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

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

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

10. CONCEPT ART

11. Project Analysis

12. Seabed Mounting O Many possibilities: 1. Mounting near pier on dedicated pole 2. Mounting on pier (measurement under quay) 3. Mounting near pier on non- dedicated pole O Aluminum tube (pole) O Commercial metal shoes with spikes for underwater attaching O Not available on rock bottom O Prefer wood constructs over metal (Finnish style)

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

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

15. Costs O ZigBee XBee RF chip 40€ O Solar panels8€ x2 O Hydrostatic pressure sensor WIKA LH-100€ (540€) O Resistors, switches, LEDs, optic fiber5€ O Battery pack5€ O Sea bed mount60€ O Casing40€ TOTAL costs166€

16. Project Schedule O Project Plan25.09. O Progress Report30.10. + electronics ready, code running O Demo A20.11. + casing ready, code ready O Demo B27.11. + mounting prototype done O Documentation done10.12.

17. End