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Wireless Ice Fishing. Group 1 Lucas Sturnfield & Scott Wakefield ECE 445 Senior Design April 30, 2009. Introduction. What is Ice Fishing? How can it be made Wireless?. Objectives. … battery-operable …able to withstand sub-zero temperatures (F°) …enhances the conventional

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wireless ice fishing

Wireless Ice Fishing

Group 1

Lucas Sturnfield & Scott Wakefield

ECE 445 Senior Design

April 30, 2009

introduction
Introduction
  • What is Ice Fishing?
  • How can it be made Wireless?
objectives
Objectives
  • … battery-operable
  • …able to withstand sub-zero

temperatures (F°)

  • …enhances the conventional

Tip-Up system

  • …wirelessly compliments the flag notification system (targeted 100m operational range)
benefits
Benefits
  • Eliminates continuous visual monitoring
  • Immediate notification of fishy activity
  • Reduces effects of weather on notification, such as difficulty seeing the flag in morning fog
  • Extends fishing range beyond the discernment of human vision
features
Features
  • Battery powered (AAA)
  • Hand-held and portable
  • Operational RF range in excess of 100 meters
  • Implemented as an add-on module for pre-existing Tip-Up systems
  • System supports 10 unique Tag devices per deployment
tag design
Tag Design
  • Block Functionalities
    • Power Monitoring
    • Catch Logic
    • User Interface
    • Linx RF System
tag design power
Tag Design: Power
  • Provides 3.3v regulated voltage from 4.5v battery power source
  • Selected voltage regulator provides an “error” line that pulls LOW when supplied voltage drops below 3.8v
  • This error line is used in logic to activate an LED to indicate a Low Power state (that is, a need to replace the batteries)
tag design catch logic
Tag Design: Catch Logic

(no fish)

(yes fish)

Tip-Up system signals by raising a flag.

Our approach is to sense when the flag is raised.

  • Implementation Ideas:
    • Use metal Structure in circuit
    • Optical Sensor
    • Pull-pin clipped to flag
    • Accelerometer
    • SPDT switch
tag design user interface
Tag Design: User Interface
  • Power Switch
  • Indicator LEDS
    • Power ON
    • Power LOW
    • Transmitting
  • Config switches to specify Tag’s ID
    • Switches connected to Encoder IO Lines
    • Switches set HIGH will pass signal when Catch Logic triggers. Switches set to LOW will tie to GND.
    • Linx System broadcasts Encoder line state changes, effectively transmitting Tag ID when fish is on the line.
tag design linx rf
Tag Design: Linx RF

Paired Linx System

Encoder + Transmitter

TX on High ENC Lines

base design
Base Design
  • Block Functionalities
    • Power Monitoring
    • Linx RF System
    • User Notifications
    • User Interface
    • PIC
base design linx rf
Base Design: Linx RF
  • Functional mirror of Tag RF
  • Passes state of decoder
  • lines to microcontroller
base design user notifications
Base Design: User Notifications
  • 7-Segment Display
  • Beeper
  • LEDs
    • Power ON
    • Power LOW
    • 4 General Purpose
      • (Debugging, RSSI feedback)
base design user interface
Base Design: User Interface
  • Power Switch
  • Select/Reset Switch
    • Flip once to silence beeper
    • Flip back to reset system
testing
Testing
  • Power Regulation
  • Temperature
  • Range
  • Lifetime
  • Did not get to effectively test:
    • Water Resistivity
    • Mechanical Ruggedness
testing power regulation
Testing: Power Regulation

All components require a minimum regulated 3.0v for operation. Therefore, the minimum operational battery supply is 3.7v

testing temperature
Testing: Temperature
  • Components most sensitive to temperature:
    • LP2989 (Voltage Regulator): −40˚C
    • ENC-LS001 (Encoder): −40˚C
    • TXM-315-LR (Transmitter): −40˚C
    • ......all components used are specified as able to function down to at least −40˚C
  • We were only able to get down to −20˚C (-4˚F) using the cold temperature facilities available
  • The device was fully functional at this temperature for the duration of the testing period (10 hours).
testing range
Testing: Range
  • Design Goal was a minimal range of 100m.
  • Empirical testing demonstrated operational range of ~130meters.
  • We could barely see each other waving at that distance, much less able to view a flag on the ground, so we claim that this design goal was achieved in good measure.
testing lifetime
Testing: Lifetime
  • Our design goal was to develop a system that would last a good weekend of Ice Fishing (meaning that the system would be in an active operation state)
  • The Tag was expected to last many hours longer than the Base due to reduced electronic complexity.
  • We were unable to measure a time when the devices failed due to low power…
testing lifetime26
Testing: Lifetime

We measured Peak-current draws of every component and are able to reasonably predict the lifespan of the device.

  • Conclusions:
    • We need larger resistors on the LEDs to limit current draw
  • (especially during Sleep)
    • We can add more batteries in parallel to increase total available mAh, and thus the lifetime of the device.
    • We can choose a lower power microcontroller solution
product viability
Product Viability
  • Similar Products on the market
    • http://www.strikesensor.com/
      • Base: $30, Tags: $25
      • Unique frequency per deployment (ours does not)
      • No unique ID per tag (ours does)
    • http://www.bbpie.com/
      • Unit: $50 (only LED)
  • Our Current Design:
    • Base: $40, Tag: $25
      • Most of cost is bulk sensitive
      • Estimate does not include manufacturing costs
problems
Problems
  • Transmission Range
    • Antenna orientation is very important
  • Frequency Selection
    • 315MHZ is crowded
  • Low-Power Indication System
credits
Credits
  • Prof. Gary Swenson
  • Mr. Peter Hedlund
  • ECE Electronics Service Shop
    • Dan Mast
    • Wally Smith
    • Mark Smart
  • ShapeMaster, Inc