Site Survey Tool for Mica Motes Justin Comroe Sean Williams Mike Jonas

Motivation Site survey tools are often proprietary to specific hardware. No tool for mica motes could be found. A practical solution for a small environment.

Steps to Achievement Interface GPS unit with Windows Mobile on the PDA and test GPS accuracy using HDOP indicator. Interface Mica motes with PDA and write broadcast and logging code. Profile signal strength as a function of distance for our hardware. Generate a contour map of signal strength for our landscape and display this to the user in a meaningful way.

GPS Accuracy Profiling Walk to Whataburger Street Grid allows us to gauge inaccuracies easily Day and Night samples HDOP relevance, 1 HDOP~= 3 feet of error

GPS Accuracy Profiling

Signal Strength Profiling A default assumption of signal strength as a function of distance is necessary for mapping using limited data sets. Place motes in a static position and then take measurements along a grid and map the connectivity at each point. Test

Signal Strength Profiling

Graphical Display Displays for the user a best guess scenario of signal strength at all points in the environment. We use our signal strength profile for original values and then bend the contours to fit the data the user provides.

Graphical Display Conceptual Design

Accomplishments We have succeeded in interfacing all hardware components necessary to complete our goal. We have created a system for learning the signal strength of any mote hardware, though our system at the moment assumes a homogenous mote environment. We have devised a method for generating a signal strength contour map with minimal upfront cost.