Transcript Tethered Data Collection System

Design of a Tethered Data
Collection System
Mike Beatty
Advisor: Prof. James Hedrick
Department of Electrical &
Computer Engineering
Union College
Schenectady, NY
Objectives/Goals
• What is it?
Objectives/Goals
• Design Specifications
– Data Collection & Transmission
– Motor Control
• Motivation behind design
– Research
– Current Method
– Other Options
Background Information
• Ballston Lake
• Reason for interest
– Depth
– Meromictic
• Permanently stratified
• Anoxic (lacking oxygen)
– Interesting Water
Column
Block Diagram
Sensor Package
Sensor Cable
Maxim 232 Level Converter
8051 Microcontroller
DC Motor
Fiber Modems & Fiber Cable
Linux PC
Anchor/Buoy Systems
• Anchor system
– Steel platform (3’ diameter)
– Motor
– Windings
– Electronics (Waterproof)
• Buoy System
– Contains sensor package
Sensor Package
Sensor Cable
8051 Microcontroller
• Motor Control
• Motor Logic
– Forward/Reverse/
Brake
PWM
• Data Transmission
–
–
–
–
UART0 & UART1
Collect/Store/Forward
Polled Operation
Level Contverter
Direction
Brake
Forward
(1)
(1)
(0)
Reverse
(1)
(0)
(0)
Brake
(1)
(0)
(1)
(1)=+5 V
(0)= 0 V
Motor
• Motor
– 12 V
– Releases cable so buoy and sensors move
• H-Bridge (55 V, 3 A)
– Motor control
– CMOS Logic
– Current Sensing
Fiber Cable/Linux PC
• Fiber Cable
– 2 Optical Bit Drivers
– ~600 ft
• Linux PC
– Protocol
– Receive Data
How it works….
Results/Conclusions
• Motor Control
• Data Collection & Transmission
Hydrolab H20 V2.20
(C)opyright 1995 Hydrolab Corporation
SN-25720
Time Temp-C DOsat DOmg/L Redox Depth Trb-r Batt
000005! 19.70 180.6 13.88
445.
0.1 N/A 12.2
000035! 19.71 64.8 4.98
445.
0.1 N/A 12.2
000105! 19.71 56.7 4.36
445.
0.1 N/A 12.2
• Future Projects
Acknowledgements
•
•
•
•
•
Prof. James Hedrick (Union College)
Prof. George Shaw (Union College)
Gene Davidson
Jim & Roland (Machine Shop at Union College)
Gautam Penumetcha (Silicon Laboratories)
Questions?