Team 1.1. Networked orientation sensor (optical) Sponsor: Freescale Monica Arroyo Beth Beaver Edward Buhidar

PROJECT ASSIGNMENT Create a networked orientation sensor for a Freescale wind turbine. Has to give direction Has to deliver this data to Thread system Must be weather resistant Cannot interfere with other internal components of turbine itself 1 Degree Resolution Remote design to run off of a 3V coin cell battery for a year

BRAINSTORMING 1) A magnetometer attached to the fin to measure direction relative of North. 2) Use a quadrature optical encoder on the shaft to determine change in direction refined by a gyroscope 3) Gray code optical encoder refined by a gyroscope for absolute location 4) Color sensor encoder for precise absolute location

ADAFRUIT RGB COLOR SENSOR Gives digital return of red, green, blue (RGB), and clear light sensing values. An IR blocking filter, integrated on-chip and localized to the color sensing photodiodes minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately.

APPLICATION OF COLOR WHEEL WITH COLOR SENSOR Issues: Need to design and our own encoder disk Need to design and fab a cuff to attach a standard PVC to the non-standard diameter of the base

IMPORTANCE OF PVC SLEEVE Rotates about the shaft Blocks light which could obscure our color readings Helps to house hardware protecting them for the elements Will have a hatch built in for accessibility to in devices housed inside

WORK BREAKDOWN STRUCTURE Hardware PVC Sleeve Color Encoder Color Wheel Encoder Disk RGB Color Sensor with IR filter and White LED Freedom Microprocessor Software Thread/Freescale Servers Linux/mbed Compiler Coding

TIMELINE Brainstorm and determine solution to task 3/12/15 Reassessed solution, determined new solution was needed 4/13/15 Design new encoder 4/20/15 Code sensor to read color 4/27/15 Attach color wheel to turbine shaft 5/12/15 Test and verify data over summer 2015 Connect to thread and verify data 9/17/15 Trouble shoot and correct any potential issues 11/24/15 Be prepared to present 12/3/15

PROGRESS/DEMO The color sensor is detecting color using the Freedom board and giving a digital return. A cross-section has been created to view how the color wheel and PVC sleeve will be mounted to the shaft

MANUFACTURABLE AND ECONOMIC Creating a fitting so standard PVC can be used. Making the encoder disk reasonably thin and out of thermal polymer All materials and devices are cheaply manufactured or widely available Power all devices from the generator with batteries for back-up

ENVIROMENTAL AND SOCIAL IMPLICATIONS Wind energy is: Plentiful Renewable Produces no greenhouse gas emissions Requires little land Clean

BUDGET Quadrature Encoder Disk (thermoplastic)~$50/Kg Epoxy- $8.96 3V coin battery~$2 PVC sleeve - $5.19 Color Sensor~$8.00 Enclosure box - $80.89 Total = $155.04 Freedom and Tower boards Provided by Freescale

REFRENCES [1] Lubosny, Z., & Lubosny, Z. (2003). Wind turbine operation in electric power systems: advanced modeling. Heidelberg: Springer. [2] Freescale.com, 'Thread Networking Protocol Freescale', 2015. [Online]. Available: http://www.freescale.com/webapp/sps/site/overview.jsp?code=THREAD-NETWORKING-PROTOCOL. [Accessed: 04-May-2015]. [3] RGB Color Sensor with IR filter and White LED - TCS34725 [Online]. Available: http://www.adafruit.com/products/1334 [4] Freescale Semiconductor, Inc.(2015, Feb.). “FXAS21002C 3-Axis Digital Angular Rate Gyroscope” [Online]. Available: http://cache.freescale.com/files/sensors/doc/data_sheet/FXAS21002.pdf [April 25, 2015]. [5] ABS Filament for 3D Printers - 1.75mm Diameter - Blue - 1KG ID: 2149 - $46.00 : Adafruit Industries, Unique & fun DIY electronics and kits', Adafruit.com, 2015. [Online]. Available: http://www.adafruit.com/ products/2149?gclid=CKOs3feJp8UCFYWVfgodsZAAgw. [Accessed:04-May-2015].