1. Sponsor: Name & Affiliation Faculty Advisor: Name Put a picture of what was created here

2. Vinh Diep Project Manager & Embedded Systems Engineer I Francisco Saavedra Test Engineer & Embedded Systems Engineer II Matthew Bringhurst Design Engineer Team Members

3.  Project Overview  Design Approach  Results  Future Work

4. GOALS OF PROJECT STRETCH GOALS  Create Low powered Sensing Node  Capture both AC/DC Voltages and Currents from Solar Panel or Wind Turbine systems  Wirelessly transmit processed data through TWP and IoT Gateway to the Proximetry Cloud Server  Updates values every 15 seconds to Proximetry  PCB Design  Recharge circuit by Solar panel or wind turbine

5. The problem: o Wired Systems o Expensive o No complete system in place Why is this important? o Remote monitoring o Scalable – Reduction of cost

6.  Continued collaboration between NXP and Texas State University  Develop a prototype and demonstrate functionality using NXP development tools (Kinetis KW24 TOWER board etc.)  Provided technology and technical advise

7. I-V Sensor Node Device Cost ItemsCost MAX4194 (2)$5.38 1N4004 (6)$.78 10k resistor (5)$.66 330k resistor (1)$.47 3.65k resistor (1)$.61 100mA fuses (3)$.66 Fuse Holders (3)$6.78 PCB Board (1)$15 50A /.075V Shunt (1)$5 Enclosure (1)$7 Terminal Strip (1)$2.89 Voltage Regulators (2)$4 Total$49.23 We planned that unit would cost under $25. The unit actually cost $49.23. The main I-V sensor cost $39.95 We’ve spent over $300 in rookie mistakes: Understanding certain components (ex. shunt) Testing out different versions of analog design

8.  16 bit MKW24 MCU and Tower Board Development System  Thread Wireless Protocol  Build the device based on Wind Turbine and Solar panel Voltage and Current maximum output 300V, 50A  Single Supply Operation

20.  Design and simulate Analog circuit with a Spice Program  Test for Linearity  Implement ADC for Voltage, Current, and DC Offset  Data Correction  Implement moving Average for True RMS  Utilize thread library to implement TWP and send data to Proximetry GUI

21.  Device is fully functional with minimal error  High Voltage AC and DC test, low DC current tested  Readings are in TRUE RMS  Dynamic DC offset calibration  Frequency of Proximetry were within reason  Accomplished Stretch Goal: PCB assembled, test, and enclosed. Battery and MKW24 also enclosed.

23. 3 ADCs for Voltage, Current, and DC offset, respectively pins 80, 79, 78 on the MKW24 DC Input Voltage Expected Digital Value Actual Digital Value % Error 0.5007V 10769 10758 0.1022 1.5020V 32262 32255 0.0217 2.5009V 53787 53810 0.0427 DC Input Voltage Expected Digital Value Actual Digital Value% Error 0.5007V10769107580.1022 1.5020V32262322550.0217 2.5009V53787538100.0427

24. 1) Stable DC Offset Voltage 2) Convert the digital representation into Voltages (1-1 ratio) 3) Plot a regression and find the slope and offset, this will be used for data correction. 4) Check Proximetry values against Voltmeter/Ammeter

25. DC offset is used in data correction calculations Changes in reference voltage over time will cause an increase in error Our Solution: Dynamic reference voltage utilizing another ADC

26. DC Test – up to 200V, up to 3.18A AC Test – up to 150VRMS *AC Current is to be tested

28. * Output from Putty

32.  Average Power Consumption testing to improve life of the battery.  Our second stretch goal was create a recharge circuit  User controlled updating to control the frequency to the Proximetry Servers.  High Current sampling to properly improve data correction factor for AC/DC Current  Research on Wind Turbine and Solar Panel abnormal behaviors/errors to improve error handling

33.  Dr. Kevin Kemp (NXP) – Technical advisor and Sponsor  Dr. William Stapleton (Texas State) – Faculty advisor  Dr. Rich Compeau (Texas State) – Faculty advisor  Sarah Rivas – Texas State Gatekeeper