Rowing Tracker. Group #47: Jai Agarwal, Nathan Zurcher, Kerem Gurpinar
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1 Rowing Tracker Group #47: Jai Agarwal, Nathan Zurcher, Kerem Gurpinar
2 Introduction
3 Introduction New method to measure an individual rower s effort on the water Existing solutions are extremely costly Peach Innovations Solution costs $8370 to outfit an 8 Our solution would cost $1016 to outfit an 8 in parts.
4 Rowing Tracker
5 Objectives Create a cheaper alternative Measure through the feet Be able to provide all information a Rowing Machine would provide Including wattage, strokes per minute, and pace(time/500 meters)
6
7 Components Hardware: Foot Sensing Module Control Unit / Printed Circuit Board Power Supply Software: Microcontroller Program Software Analysis Tool
8 Foot Sensing Module Detect force up to 100kg (220.4lbs) per foot Compatible with existing boat footwear Robust - steel plates 2 3-wire strain gauges per foot Capable of carrying 50kg (110.2lbs) each 1.19lbs per foot module
9 Force Sensing Module - Final Product
10
11 Control Unit Components Inputs ATMega328 Microcontroller HX711 Analog to Digital Converter SanDisk 8GB microsd Card XA1110 GPS (external) 4 3-wire strain gauge inputs (analog) GPS via I2C Reset button 5 Volts Outputs Red and Green LED SD card INSERT PHOTO OF THING
12 Control Unit - Schematic
13 ATMega328 Process Activate microsd Card Generate new CSV file with unique name Receive serial input from A to D Receive I2C input from GPS Record CSV lines with GPS time stamp and force input
14 ATMega328 Schematic
15 Control Unit - Analog to Digital Converter No need for individual sensor values Wheatstone Bridge sums 4 different strain gauge inputs Allows use of only one A to D converter 24 bit converter generates large range
16 Control Unit - Analog to Digital Converter(Schematic)
17 Control Unit - microsd Card SanDisk Ultra 8GB Class 10 UHS-I Listed write speed of 100 Mbits/second in SPI mode 8GB card allows for ~652 hours of constant recording
18 Control Unit - SD Card(Schematic)
19 Control Unit - Outsourced Components XA GPS Module Backup battery -- Quicker Fix Small Profile Very sensitive Battery Pack/5V Supply
20 5 Volt Power Supply (Eliminated) 5V output 2500 mah to allow 6-10 hours of operation Sustained loads of 200mA; peaks of 250mA Requirements are easily met by readily available product Save time and money
21 Power Supply 5500 mah allows more than 20 hours of operation assuming total load of 200mA 5 Volt 1 Amp output greatly exceeds requirements
22 Software Analysis Tool Input: Data from SD card Output: Rowing Machine outputs and further statistics Smooth Data Calculate Rowing Machine values wattage, strokes per minute, and pace(time/500 meters)
23 Data:
24 Interface Region Selection Zoomed Selection
25 Data Analysis Provides: Graphical representation (smoothed) Savitzky-Golay Filter Rowing Machine Information
26 Requirements and Verifications -Force Sensing Module Footplate can accurately record a stroke Force sensors did max at any point throughout the stroke Enough samples taken to clearly define force curve
27 Requirements and Verification - Power Module PCB low power consumption. Resistor Load test of 500mA on battery pack Voltage sag of less than 0.15 volts No overheating of battery pack or vias Resistor Load test of 350mA on 3.3V regulator Wired PCB through ammeter found total current draw of 70mA Slightly greater than expected 52mA Voltage sag of.10 volts Regulator did not overheat throughout 15 minutes of load Ran device on battery pack for 6 hours Device charge indicator showed no change
28 Requirements and Verification - PCB Components SD Card Capable of recording CSV data as generated without slowing system 138 second test generated 47KB = 340.5KB/second 340.5KB/second -> 2.7Mbits/second < 100Mbits/second max GPS Unit Generate 1 sample/second of date, time, latitude, longitude, and speed Data was printed to serial out and displayed on computer Time/Date was accurate within 5 seconds Position/speed accurate within 10 seconds(outdoors) Low power usage Consumed 60mA while seeking Consumed only 40mA once lock Well within design parameters for battery life
29 Requirements and Verification - Software Module Have an interface that would be easy for users to use Presents information that Rowing Machine would wattage, strokes per minute, and pace(time/500 meters)
30 RV-Troubleshooting Unstable behavior Worked perfectly on Arduino Uno Isolated Issue to External Clock using Oscilloscope
31 RV-Troubleshooting RV-Troubleshooting Oscillator Pins Arduino Oscillator Pins PCB
32 RV-Troubleshooting Moved new oscillator to proto board PCB leads for oscillator thought to be faulty Wire distance too great led to intermittent faults
33 Component Cost
34 Future Work Expand system to outfit an entire boat Improve accuracy through more quantitative analysis Improve system waterproofing Easy connect/disconnect of foot plates from control unit VO2 Mask
35 Questions?
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