grassinator1300 senior design mid-semester design presentation 2014
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Grassinator1300Senior Design
Mid-Semester Design Presentation 2014
Julie White (Team Leader)• Website• Sensors• Autonomous Implementation
Glen Luker• Remote Control Implementation• Autonomous Implementation• Hardware Implementation
Grassinator1300 Team
Grassinator1300 Team
Aaron Ray• Power System Design• Electrical Subsystem
Testing• CAD Design
Perry Clark• Hardware Implementation• Hardware Components
Testing• Hardware Debugging
Timothy Mange• Lead Documentation• Electrical Subsystem Design• Power System Testing
Faculty Advisor
Dr. Raymond Winton
Overview
• System Overview• Problem and Solution• Technical and Practical Constraints• Changes and Refinements• Packaging• Test Plan• Future Goals
System Overview
Power System Microcontroller
Drive System
SensorsRemote Control
Problem and Solution
Problem
Current lawn mowers require prolonged physical labor and sun exposure.
Riding mowers can create additional cleanup work because of their size.
Push mowers do not create cleanup work but still require physical work and sun exposure.
Combine the usability of a riding mower with the size of a push mower, while further reducing the sun
exposure with autonomous features.
Solution
The Grassinator1300 intends to solve these problems by providing a small gas-powered push mower platform that is radio-controlled (RC).
• Use RC mode to record and execute movements
• Operate in autonomous mode
• Allow user to supervise from a nearby shady area
• Limited physical labor.
Solution
Technical and Practical Constraints
Name Description
Battery Requirements The Grassinator1300 must be powered by a 24 VDC battery supply.
Obstacle Detection Obstacles must be detected at a minimum of 6-inch range.
Remote Control The remote control must be able to communicate with transmitter up to 150 feet without any obstructions.
Cutting Height The Grassinator1300 must have an adjustable cutting height between 1-2.5 inches.
Speed/Servos The Grassinator1300 must be able to maintain a speed of about 3 MPH.
Technical Constraints
Proper safety measures and shut off features should be implemented to keep people and animals safe.
System will shutoff if:
• Microprocessor malfunctions
• Motor stops working
• Sensor fails
Practical Constraints
Health & Safety
The Grassinator1300 will not be designed to work in stormy or inclement weather.
Practical Constraints
Environmental
[1]
Changes and Refinements
Kill Switch
• Allows the microcontroller to control the blade motor• PCB Relay Circuit (original design)
• Arduino could not supply enough current to activate.• Time delay too large if power was lost.
• Relay Module(new)• Integrated circuit• Arduino compatible
[2]
Battery Monitor
• Allows user to actively monitor the battery level.• Voltage divider maps voltage into safe range.• Keeps device from becoming unstable.
[3]
SD Card Reader• EEPROM onboard Arduino (Original)
• Limited memory• Expensive• Stored directly in memory
• SD card reader (New)• Interchangeable memory cards• Inexpensive• Stored as a character in a file [4]
Arduino Uno to Arduino Mega
• Added features require more digital I/O pins• Mega: 54 digital I/O pins• Uno: 14 digital I/O pins
• Minimum code change requirements.
[5]
Packaging
Schematic
Schematic
Schematic
Schematic
PCB3
inch
es3.85 inches
PCB Enclosure
Packaging
Test Plan
PROJECTED TIMELINEDescription Date
Order PCB ASAP
PCB Trace Testing 3-28
PCB Population 3-31
Overall System Test 4-4
Projected Timeline
Test Plans part 1
• The PCB will be trace tested and populated within a week of arrival from manufacturer
• Then PCB will be powered and checked for expected voltages
• Subsystems will then be tested using the PCB to ensure functionality
Test Plans part 2
• Subsystems will be secured inside enclosure and constraints testing will begin on overall system.
• Field testing of entire system.
• Retesting of any corrections made due to failed tests.
Jan. Feb. March
April May
PCB Design
Prototype Refinement
PCB Population/ Packaging
Testing & Debugging
Future Goals
[1] “How to Mow Now That it has Stopped Raining”, Purdue, Accessed: Sept . 28, 2013 http://purdueturftips.blogspot.com/2013/04/how-to-mow-now-that-it-has-stopped.html
[2] “Relay Module (Arduino compatible)”, DFRobot, Accessed: March 3, 2014 http://www.dfrobot.com/index.php?route=product/product&product_id=64#.UxUdt_ldXni
[3] “How Well Do Ipad Batteries Compare to Other Tablets? Ipads Smoke the Competition”, Iphone Hacks, Accessed: March 3, 2014
http://www.iphonehacks.com/2012/12/ipad-battery-comparisons.html
[4] “SD Card Reading Writing Module for Arduino”, DX, Accessed: March 3, 2014 http://dx.com/p/sd-card-reading-writing-module-for-arduino-deep-blue-142121
[5] “Arduino Mega 2560”, Arduino, Accessed: March 3, 2014
http://arduino.cc/en/Main/arduinoBoardMega2560#.UxUhGvldXng
References
Grassinator1300Senior Design
Mid-Semester Design Presentation 2014
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