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

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

5 CDR 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 CDR ECE 415 Design Choice (BlueTooth + Computer) MMMMM M GGGGGGG GG Blue Tooth

7 CDR ECE 415 Block Diagram

8 CDR ECE 415 Why this design choice?  Arduino RBBB 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 CDR ECE 415 MDR progress snapshot  Arduino board wired and programmed.  Used potentiometers to simulate sensors.  Sensors, Display, blueTooth purchased.  Used LED to represent readings.

10 CDR 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 CDR ECE 415 Current Design prototype Arduino Sensors BlueTooth Display Sensor Connectors

12 CDR ECE 415 On Sensor precision  Temperature sensor response.  pH & salinity are linear functions Linear line has a temp range of: -10 – 80C

13 CDR 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)

14 CDR ECE 415 Sensing Duration vs Sensing Sample Rate (cont’d)

15 CDR ECE 415 On Power Consumption (Measurements)

16 CDR ECE 415 On Power Consumption (Battery Life)  Not long enough to leave sitting for a while…  Solution?

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

18 CDR 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 2 weeks mAh x hour = mA per day.  Total current used per day = mA.  Using 1 D battery  last 1 week (conservative).  Using 2 D batteries  last 2 week (conservative).

19 CDR ECE 415 Vision of handheld device

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

21 CDR ECE 415 Future work  Finish Bluetooth  Quantify accuracy  Printed Circuit Board  Matlab rudimentary processing  Case design

22 CDR 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

23 CDR 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

24 CDR ECE 415 Gantt Chart

25 CDR ECE 415 Q & A Thank You!