Team Advisor: Professor Marinos Vouvakis Douglas Imbier EE Team Leader wireless, sensors Edmons Zongo EE Treasurer display, sensors Nicholas Ferrero EE Website Admin power, matlab Matthew Picard EE Purchaser memory, sensors Clean H2O

2 FDR ECE 415 Agenda  Objective  CDR overview  Current design  Future work  Look back

3 FDR ECE 415 Project Objective Society Need  Need for water quality measuring for under developed countries Engineering Need  Handheld device that will display real-time measurements (pH, salinity, temperature) of a liquid  Wireless transmission using Bluetooth technology

4 FDR ECE 415 Existing Alternatives  Expensive  Individual sensing devices  Integrated devices but for expert / industrial use  High cost / lead to rentals

5 FDR ECE 415 Proposed Design Features  Must be more affordable than current designs (≈$300).  Must be portable handheld device.  Must accurately measure pH, salinity, temperature.  Must include real-time display & wireless data transmission (see below)  Must have data log and rudimentary processing capabilities (off-board).

6 FDR ECE 415 Design Choice (BlueTooth + Computer) MMMMM M GGGGGGG GG Blue Tooth

7 FDR ECE 415 Block Diagram

8 FDR ECE 415 Why this design choice?  Arduino MINI development board: multiple I/Os, easier software development, reliable.  Nokia 6100 LCD display: real-time measurements, color, cheap, low power.  BlueSmirf Gold Bluetooth: reliable, range ≈100m.  Vernier temperature probe, ph and salinity sensors: accurate, cheap.

9 FDR ECE 415 CDR progress snapshot  Arduino board wired and programmed.  Used sensors for real time measurements.  Sensors, Display, Arduino integrated.  Showed BlueTooth connection.

10 FDR ECE 415 Current Design  Finalized design decisions Display, memory, streaming vs. real time, on/off switches, LED lights, sampling rate, power consumption  LCD integration  Sensor integration  Establish bluetooth connection with PC

11 FDR ECE 415 Breadboard Design prototype Arduino Sensors BlueTooth Display Sensor Connectors

12 FDR ECE 415 Sensing Duration vs Sensing Sample Rate  Constrain: No external memory used.  Constrain: Federal regulations require public drinking supplies to be tested every 4 hours.  With given memory size, sample rate will determine how long we can store data.  Utilize Arduino built in memory 14KB(total) – 8KB(software) = 6KB(left for storage)  6000bytes/12bytes(data) = 500(samples)

13 FDR ECE 415 Sensing Duration vs Sensing Sample Rate (cont’d)

14 FDR ECE 415 On Power Consumption (Measurements)

15 FDR ECE 415 On Power Consumption (Battery Life, cont’d) 9V AAA AA C D Lithium Ion

16 FDR ECE 415 Power Senario  Arduino and Sensors on all day mAh x 24 hours = mA per day.  Display put on for 1 hour every day. 70.7mAh x 1 hour = 70.7mA per day.  Bluetooth turned on for 5 minutes every week mAh x 5/(60x7) hour = mA per day.  Total current used per day = mA.  Using 9V battery  lasted 3.5 hours(tested).

17 FDR ECE 415 Recap (Accomplishments)  Integrate multiple sensors  Integrate LCD display with Arduino  Integrate Wireless connection (need more work)  Stay below budget (parts break!!)

18 FDR ECE 415 Future work  Finish Bluetooth  Quantify accuracy  Updated Printed Circuit Board  Case design

19 FDR ECE 415 Demo Day Deliverables Hardware:  Integrated handheld device  Wireless connectivity Software:  Data logging using Matlab  Arduino programmed using C Suggested Demo:  Show functionality by testing controlled samples

20 FDR ECE 415 Design Costs Design (BT+PC) Printed Circuit Board$47.50 Ph Sensor$92.00 Temperature Sensor$29.00 Salinity$79.00 Arduino$19.95 Display$39.95 Bluetooth$64.95 Battery$14.95 Total:$ Budget$ Budget Surplus$112.70

21 FDR ECE 415 Gantt Chart

22 FDR ECE 415 Q & A Thank You!