This document outlines the design and implementation of a smart power monitoring system. It discusses initially powering the system using a Kill-A-Watt meter to sample voltage and current over time. A Digispark microcontroller converts the analog data to digital and sends it over USB to a Raspberry Pi for processing and storage in a database. A web interface was created using Web2Py, JavaScript and various charting libraries to display power measurements and allow for scheduling and device switching. Future improvements include adding actual power switching capabilities and simplifying the setup process.

1. - Ryan Nash
- Jacob Thornton

2. Overview
 Initial idea and design
 Hardware selection and implementation
 Software selection and implementation
 Web interface
 Future improvements
 Marketability
 A sad day…

3. Idea and Design
 Power awareness
 Reduce power consumption
 Lowered cost
 Accessible from anywhere
 Mobile and PC
 Other features
 Device switching
 Scheduling
 Power usage plotting
 User Friendly

4. Hardware Selection and
Implementation
 Kill-A-Watt
 Power sampling
 Digispark
 Analog-to-Digital conversion
 Data Gathering
 Raspberry Pi
 Data consolidation, processing,
and storage
 Host web page
 WiFi dongle

5. Physical Build

6. Software selection and
Implementation
 C
 Place ADC data into array
 Send over USB to Raspberry Pi
 Python
 Gather ADC data
 Process ADC data
 Store voltage and current
measurements in database
 Web2Py
 Web framework
 Manage Database



Power Measurements
Scheduling
Status
 Host administration interface
 Javascript
 Kendo UI
 Highcharts
 Custom

7. Web Interface

8. Web Interface

9. Web Interface

10. Data Handling & Processing
 Ten samples per second
 Voltage and Current
 JSON Formatting
 Timestamp key

Voltage-Current pair
 Five minute segments
 Stored in unique log file
 Compute power average
 From RMS voltage and current
 Store result

11. Future Improvements
 Implement safe switching circuitry
 Simplify setup process
 Implement security features
 Multiple devices on network
 Additional accessories

12. Marketability
 Accessory to Kill-A-Watt
 Require only 3 external contacts
 Connect via pogo pins
 Custom casing
 Switching circuitry
 Raspberry Pi & Digispark
 Affordable
 Currently only $80
(including Kill-A-Watt)

13. Conclusion
 Successful
 Power sampling
 Data processing and storage
 Web interface
 Scheduling
 Unsuccessful
 Actual power switching
 Live demo