Stream depth gauge
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Stream Depth Gauge. Team: SDMAY 12-23. Team Members John Henderson Curt LaBarge Greg Pearson Yixin Qiao. Client/Advisor Steve Holland (ISU Canoe and Kayak Club). Project Goal. Design and build a low-cost stream depth gauge The gauge should be: Self contained

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Stream Depth Gauge

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Stream depth gauge

Stream Depth Gauge

Team: SDMAY 12-23

Team Members

John Henderson

Curt LaBarge

Greg Pearson

Yixin Qiao

Client/Advisor

Steve Holland

(ISU Canoe and Kayak Club)


Project goal

Project Goal

Design and build a low-cost stream depth gauge

The gauge should be:

  • Self contained

  • Robust in the environment

  • Low maintenance

  • Low power

  • Capable of transmitting measurements wirelessly

SDMAY12-23


Problems

Problems

Iowa flow levels change dramatically

  • Current gauging strategies are inadequate

    • High Maintenance

    • At threat of cancelation

    • Cover a limited amount of streams and rivers

  • Canoers and Kayakers need easy access to flow data to accurately plan trips

  • Some waterways are currently not monitored

Photo Credits: ISU Canoe and Kayak Club

SDMAY12-23


United states geological survey

United States Geological Survey

Expensive

  • $5,000/yr to maintain

    Complex Design

  • Stilling basin

  • Two story structure

  • Under ground pipes

  • Electronic recorder

Typical USGS Gauge Design

Photo Credit: USGS http://ga.water.usgs.gov/edu/streamflow1.html

SDMAY12-23


Functional specifications

Functional Specifications

  • Total Price of Materials < $500

  • Measurement Accuracy: 1inch

  • Operating Temp: -5°C to 70°C

  • Survivable Temp: -40°C to 70°C

  • Daily data transmission

  • Power save during winter

SDMAY12-23


Weather conditions

Weather Conditions

Our design must withstand the following:

High Winds

Floods

Rain

Snow

Ice

SDMAY12-23

Photo Credits last slide


River conditions

River Conditions

  • Any object placed directly in body of water must withstand the following conditions:

Ice formations

Other Floating debris

SDMAY12-23

Photo Credits last slide


Non functional specifications

Non Functional Specifications

  • Low maintenance cost

  • Long battery life

    • Minimum: 1 yr

  • Rugged design

SDMAY12-23


Sensor options

Sensor Options

Possible Choices:

  • Ultrasonic range sensor

  • Float System

  • Water Pressure Sensor

  • Air Pressure Sensor

    • Absolute

    • Differential

SDMAY12-23


Sensor options1

Sensor Options

  • List of Choices:

    • Ultrasonic range sensor

    • Basic Float System–Moving parts easily break!

    • Water Pressure Sensor - Too expensive !

    • Air Pressure Sensor

      • Absolute – Not as simple as differential option

      • Differential

SDMAY12-23


Sensor options2

Sensor Options

SDMAY12-23


Choosing a sensor

Choosing a Sensor

Best option: Differential Air Pressure Sensor

  • Why?

    • The sensor costs 1/10th of the ultrasonic sensor

    • Can be placed underwater instead of above it

    • Could be buried under sand

      • Sand can be used to protect the sensor

    • Leaves the team with more installation options and configurations

SDMAY12-23


Under water housing concept and design

Under Water HousingConcept and Design

  • Water level is proportional to air pressure inside cylinder

  • As water depth over cylinder increases, so does air pressure

  • Housing and tubing buried under a sand bank for added protection against floating debris

AIR

Tube to Pressure Sensor

SDMAY12-23


Concept diagram

Battery

Concept Diagram

Microcontroller

Pressure Sensor

Cell Module

Water

Voltage Regulator

Voltage Regulator

Voltage Regulator

Power Bus

Air

Solar Cell

Charging Circuit

SDMAY12-23


Concept diagram1

Concept Diagram

SDMAY12-23


Microcontroller

Microcontroller

  • The team will use the ATMega128

  • Why

    • Past experience

    • Can talk directly to cell modem through UART

  • State machine style in our programming

    • will greatly help out in our debugging phase

SDMAY12-23


Cell module

Cell Module

  • Pros:

    • Easy to use

    • Commands given through UART

  • Cons:

    • Poor signal strength

      • We will choose a testing location based off of this

    • Prepaid Billing

      • The more we test, the more we pay

SDMAY12-23


Hardware

Hardware

  • Cell Module will “text” the ISU Canoe and Kayak Club with measurements

    • Measurements will occur once per day

  • Microcontroller will:

    • Take pressure sensor reading

    • Convert pressure reading into water depth

    • Send data to cell module for transmission through UART

SDMAY12-23


Power circuit

Power Circuit

  • Determines the success of our project

    • Must be designed to keep system powered for an entire year

    • All components should contain as low leakage current as possible

  • Foreseen issues we are currently dealing with

    • Snow build up on solar cell

    • Battery failure due to cold weather

    • Strict power budget

SDMAY12-23


Power circuit hardware

Power Circuit Hardware

  • Power Circuit will consist of

    • 5 Watt solar cell

    • 2 6V Lead Acid Batteries

      • Charging circuit

    • 3 Voltage regulators will be used to keep Microcontroller and Cell Module’s input voltage constant

SDMAY12-23


Power budget

Power Budget

SDMAY12-23


Past accomplishments

Past Accomplishments

  • Extensive research on:

    • Possible Environmental Conditions

    • Different options for measuring water height

    • Power Requirements

  • We have purchased the following:

    • Microcontroller

    • Pressure Sensor

    • Cell Module

    • Under-water tubing

    • AT&T SIM Card

    • Solar Cells and Battery

SDMAY12-23


Current tasks

Current Tasks

  • Test individual components such as:

    • Cell Module

    • Microcontroller

      • Waiting for Evaluation board

    • Pressure Sensor

  • Designing power system

    • Choosing components based off of 5Watt power budget

SDMAY12-23


Future tasks

Future Tasks

  • Test Power System Components

  • Construct Under Water Housing component

  • Program microcontroller and cell module

  • Put system together

  • Create working prototype by spring thaw

  • Upon Spring Thaw:

    • We will field test our prototype in a local stream

SDMAY12-23


Testing requirements

Testing Requirements

  • Our team will test the following:

    • Accuracy of water height measurement

    • Air leakage in under water housing unit and tube

    • Power Management

      • Can solar cell keep system charged up for a year?

    • Wireless signals

    • Max and Min operating temperatures

    • Overall ruggedness of system

      • Will the system hold up to extreme weather conditions such as rain, snow, hail, wind?

SDMAY12-23


Project status

Project Status

  • Microcontroller and Cell Module have arrived

  • Power Components have been ordered

  • Under water housing has been designed and will be built in the coming weeks

  • Software implementation has been researched and test code is currently under development

SDMAY12-23


Main goal

Main Goal

  • The team is working hard to complete a working prototype by spring thaw

    • This goal has been set by our advisor who has stressed this goal since day one

    • Field testing our system is vital and will be used to point out any weaknesses our system might have that controlled testing could not.

SDMAY12-23


Questions

Questions ?

Brief Summary

  • Stream depth gauge

  • Components

    • Pressure sensor

    • Microcontroller

    • Cell Module

    • Power Circuitry

  • Major Tasks

    • Implement code

    • Build prototype by spring thaw

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SDMAY12-23


Image sources

Image Sources

  • “High Winds” http://freeimagefinder.com/pic/scargill.html

  • “Rain" http://www.desicomments.com/desi/rain/

  • “Floods” http://www.securityworldnews.com/2011/09/28/dont-become-the-victim-of-a-flood/mailbox-in-flood-waters/

  • “Snow” http://wallpaper-s.org/42__Snow-Covered_Trees,_Varmland,_Sweden.htm

  • “Ice” http://www.danzfamily.com/archives/2007/12/tulsa_ice_storm_pictures_update.php

  • “Ice Formations”http://www.minnesotansforglobalwarming.com/m4gw/2009/03/ice-blasted-to-put-end-to-bismarck-flood.html

  • “Other Floating Debris” http://www.paddlinginstructor.com/blog/general-news.html?start=20

  • All other images were taken from Microsoft Office Clip Art

SDMAY12-23


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