Date post: | 28-Dec-2015 |
Category: |
Documents |
Upload: | naomi-karen-gibbs |
View: | 218 times |
Download: | 1 times |
Need and Project Scope
Oscar’s habitat lacks many of his natural needs due to it being an artificial environment.
Need: Fully function device to enrich Oscar’s mental and physical health
Specific Design Requirements
Cost Maximum: $150
Cannot be used to escape Otters can jump 6 feet
Buoyant Electronic parts must be waterproofed
Indestructible Bite strength of 223.4N
Design Requirements Cont.
Wieldable Otter paw dimensions: 9.05cm x 7.62cm
Should not cause or encourage over-activity, stress, obesity, or illnesses
Contains sensors to gather data to quantify otter’s health and enrichment levels General behavioral data
Durability - Otter Destruction
Valuable items inside of the ball - Arduino and food
River Otter jaw - 3 pairs of incisors instead of 4 like most otters Ball must be larger than jaw (10-12cm)
Gnawing issues Bite strength of 223.4N Plastic (1.75mm ABS) ultimate strength of 40MPa Needed surface area of 5.6x10-4 cm2
Radius concluded to be 8cm
Durability - Buoyancy
The ball is mainly hollow due to two compartments - sensor and food
Sensor setup is 473g
Total volume of plastic used is 804 cm3 with weight of 2128g
Final weight of 2601g
Based on volume, 2145g of water displaced
Chosen Design
Two interlocking hemispheres - food containment and Arduino container
Locking Mechanism
Sensor Network
Parts and Manufacturing
1.75mm ABS plastic
7 parts connected using adhesive, except sensor lid
Sensor Network
Sensor Network
Three parts Sensors, Microcontroller, Wi-Fi Shield
Battery Supply 8 AA Lithium ion rechargeable batteries
Sensor Selection
Adafruit Inertial Measuring Unit (IMU) Accelerometer & Magnetometer (LSM303) Gyrometer (L3GD20H)
$19.95
Wi-Fi Shield
Purchased separately form the Arduino ($29.95)
Enables transmission of signal to remote computer on network every 10 minutes
Main source of power consumption
Battery Selection
Rechargeable AA batteries because of 1A and 9-12V requirement of Arduino with Wi-Fi shield
Software and Demonstration
Arduino and sensors collect data every second
Transmits data for 10 minutes
Transmits data to host computer
Host computer translates raw data into relevant measurements
Conclusion
Enrichment issue has been solved
Possibility of behavioral studies
Expand sensor threshold to include accelerometer data Potentially give data on solve speeds
What was learned? More CAD experience, otter facts, working with a customer,
working in a group
Different strategy - Delegating work often increased efficiency, but sometimes led to miscommunication problems