1. Electrical & Computer Engineering Presentation by: Andrew Frieden Matthew Weydt Nick Setzer Tyler Dunn FPR 2011 – Team Gong

2. 2 Electrical & Computer Engineering Presentation Overview  General Project Overview  Changes from CDR  Regression Equations  Calibration and Testing  Cost  Demo

3. 3 Electrical & Computer Engineering General Project Overview  Our project has three main stages: First, our microcontroller uses multiplexers to take many analog samples from our spectral radiation sensors. These sensor values get passed through a calibration function so that they accurately describe the current irradiance. Next, our microcontroller passes the values to a GPRS transmitter which creates a TCP packet and sends it to a page that populates our database of sensor values. Lastly, our python application reads our sensor values off the server and does a bilinear interpolation on the values to find the best potential value on the sensor sphere. It then calculates useful output like money and power saved.

4. 4 Electrical & Computer Engineering Changes From CDR  Interpolation code is now server side instead of on an android application. The android application was thrown out by a group decision after CDR feedback  We created a multiplatform application (Windows/Linux/Mac) in Python that does all the data processing and has a simply GUI for useful output

5. 5 Electrical & Computer Engineering Regression and Calibration Equations  We used a one point equation to match the reading from each of the sensors (first step of calibration)  Mapped sensor readings to irradiance provided by weather.cs.umass.eduweather.cs.umass.edu  Money Saved= (Electricity price/KwH)*[(Irradiance/Standard Testing Conditions) *(Expected System Output in Watts) *(Inverter Efficiency)]/1000

6. 6 Electrical & Computer Engineering Empirical Data from s4 Device *Approximately 650 data points per row

7. 7 Electrical & Computer Engineering Calibrated Measurements to Irradiance

8. 8 Electrical & Computer Engineering Cost  Total Spent: 565  Actual Cost Transmitter – $60 Stalker Board – $50 Sensors – $40 Misc. - $20_________ Total - $170  Estimated Production Cost:~$50

9. 9 Electrical & Computer Engineering Demo  Periodic Wakeup/Sleep  Sensor Readings  Save and Read to/from SD card  GPRS transmission  Server processing  End user application

10. 10 Electrical & Computer Engineering Project Management  Andrew Frieden, CSE: Embedded System Programming Money saving, power saving and direction of optimal solar panel algorithms Web Designer  Matthew Weydt, CSE: PHP Web Server development MySql Server development GPRS programming  Nick Setzer, EE: Solar panel step down converter Power supply system Python Application  Tyler Dunn, EE: Sensor testing and Integration Device construction Power system testing Assist Arduino and GPRS programming