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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
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Agenda
Objective
CDR overview
Current design
Future work
Look back
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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
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Existing Alternatives
Expensive
Individual sensing devices
Integrated devices but for expert / industrial use
High cost / lead to rentals
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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).
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Design Choice (BlueTooth + Computer)
MMMMMM
GGGGGGGGGBlue Tooth
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Block Diagram
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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.
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CDR progress snapshot Arduino board wired and programmed.
Used sensors for real time measurements.
Sensors, Display, Arduino integrated.
Showed BlueTooth connection.
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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
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Breadboard Design prototype
Arduino
Sensors
BlueTooth
Display
SensorConnectors
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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)
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Sensing Duration vs Sensing Sample Rate (cont’d)
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On Power Consumption (Measurements)
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On Power Consumption (Battery Life, cont’d)
9V AAA AA C D Lithium Ion
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Power Senario
Arduino and Sensors on all day.• 66.972mAh x 24 hours = 1607.328 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.• 32.588mAh x 5/(60x7) hour = 0.388 mA per day.
Total current used per day = 1694.322 mA.
Using 9V battery lasted 3.5 hours(tested).
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Recap (Accomplishments)
Integrate multiple sensors
Integrate LCD display with Arduino
Integrate Wireless connection (need more work)
Stay below budget (parts break!!)
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Future work
Finish Bluetooth
Quantify accuracy
Updated Printed Circuit Board
Case design
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Demo Day DeliverablesHardware: Integrated handheld device Wireless connectivity
Software: Data logging using Matlab Arduino programmed using C
Suggested Demo: Show functionality by testing controlled samples
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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: $387.30
Budget $500.00
Budget Surplus $112.70
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Gantt Chart
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Q & A
Thank You!
