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

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

 Project Overview  Design Approach  Results  Future Work

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

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

 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

I-V Sensor Node Device Cost ItemsCost MAX4194 (2)$5.38 1N4004 (6)$.78 10k resistor (5)$ k resistor (1)$ k resistor (1)$ mA 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 $ 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

 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

 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

 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.

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 V V V DC Input Voltage Expected Digital Value Actual Digital Value% Error V V V

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

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

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

* Output from Putty

 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

 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