Electrical & Computer Engineering Presentation by: Andrew Frieden Matthew Weydt Nick Setzer Tyler Dunn PDR 2012 – Team Gong Self Sustaining Sensor System s4

2 Electrical & Computer Engineering Presentation Outline  Problem  Solution  System Level Requirements Software Component Requirements & Functional Flow Diagram Hardware Component Requirements & Functional Flow Diagram  Power Consumption  Sample Frequency  Microcontroller

3 Electrical & Computer Engineering Presentation Outline continued  Transmitter  Server  Data Processing  Budget  Deliverables

4 Electrical & Computer Engineering Problem Being Addressed  Land degradation Depletion of soil nutrients Inappropriate irrigation Over fertilization Other land pollutants  Water pollutants Acid rain from human introduced toxins Oxygen Depletion Pathogens  Other environmental issues

5 Electrical & Computer Engineering Solution  Modular, robust device to report on current status of environment around it  Compatible with two environments: Water and Soil  Completely autonomous for convenience of end user

6 Electrical & Computer Engineering System Level Requirements  The device shall be able to sense and collect data from two types of environments: water and soil  The device shall be completely autonomously powered and operated  The device shall be able to communicate autonomously to a server via GPRS  The device shall be supported by an android software application  The software shall be able to display a graphical representation of the sensor data

7 Electrical & Computer Engineering Software Component Requirements  Android application shall be able to post and receive data to and from a database  Application shall be able to format and present data from a database in a graphical user interface  Web service shall be able to provide communication between the device and the server

8 Electrical & Computer Engineering Software Component: Functional Flow Diagram MySQL Database Android Application Http Post Web Service GPRS SIM Card /GPRS Module

9 Electrical & Computer Engineering Hardware Component Requirements  The energy harvester shall be able to fully charge a battery at least 3 seasons of the year  The battery shall be able to power the microcontroller, sensor device and on board transmitter  The sensor shall be able to regularly take accurate readings of its current environment and transmit them to the microprocessor  The data shall be able to traverse from on board memory to an on board transmitter in increments of no more than 1400 bytes

10 Electrical & Computer Engineering Hardware Component: Functional Flow Diagram

11 Electrical & Computer Engineering Power Consumption  Solar Panel supplies a maximum of 1.8 Watts at 125 mAh  2000mAh capacity battery will take hours to fully charge  Typical operation, 500mAh will be drawn 4 hours continuous use  When powered on for 12 minutes: 5% of the battery is discharged minutes to recharge back to full ~72 minute cycles Operates for 24 hours without charging

12 Electrical & Computer Engineering Sample Frequency  Minimum of 72 minute sample cycles using best case operating power, and sending after every sample  Will be at least once every 2 hours Results in 20 samples in 40 hours without recharging  Reduced transmit rate Delay sending until several samples have been taken Will increase how often a sample can be taken

13 Electrical & Computer Engineering Gecko micro controller  Ultra low power 1 to 16 MHz configurable clock rate 200µA per MHz when running 8 Mhz 1250 continuous operating hours with 2000mAh battery 45µA per MHz Sleep Mode 5µA Deep Sleep Mode  32Kb Flash memory  UART / SPI interface  GPIO Pins

14 Electrical & Computer Engineering Transmitter  GPRS (General Packet Radio Service) GSM/GPRS 850/900/1800/1900MHz Performance for voice, SMS, Data, and Fax Low power consumption: 1.5mA(sleep mode) Operation temperature: -40°C to +85 °C

15 Electrical & Computer Engineering Transmitter Continued  Transmit using GPRS (Mobile Internet) 1460 byte package sizes UART interface to Microcontroller  Use web methods for posting data to MySQL database

16 Electrical & Computer Engineering Server  MySql/Sql Server $4-$10/mo Bandwidth: 1-unlimited GB Web Space: 80-unlimited GB Datacenter Locations: Columbus, Ohio Chicago, Illinois

17 Electrical & Computer Engineering Budget ItemExpected Cost Solar Energy Panel$20 Dc-Dc Step Up Converter$10 Battery$30 Soil Sensor$100 Low Power Micro Controller$70 Wireless Transmitter$100 Water sensor$40 Database$40 Total$410

18 Electrical & Computer Engineering Deliverables: MDR Fall 2011  Sensor / Micro controller communicating  Power Supply charging battery  Server and software communication  System integration to be completed next semester