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!