In this experiment we will measure the disruption of the signal with various obstacles.
Position the three motes as before in a triangle, 1 m apart. Arbitrailiy assign one of the motes to be the target and the other two sensors.
SubExp 1: Take a base-line measurement
SubExp 2: Stand close to the target (as if wearing it as a badge). Take measurements for 2 minutes. Rotate your position relative to the target and the sensors so you are standing off to the side, still close to the target by about 30 degrees (as if you were wearing the badge and rotated your position, but don’t move the target). Continue to move around the target in 30 degree increments for a complete revolution.
SubExp 3: Stand between the target and sensor 1. Move backwards toward sensor 1 in increments of 10 cm to a distance halfway between the target and the sensor.
SubExp 4: Place a closed laptop facing vertically (as if carried in the hand on its side) so it is blocking the line of sight from the target and sensor motes. Move the laptop in increments of 10 cm to a distance halfway between the target and the sensor.
SubExp 5: Connect the sensor to the USB port of the laptop with a short (5-10cm ) USB extension cord and place the laptop horizontally next to the sensor. Move the laptop around the sensor 360 degrees in increments of 30 degrees.