EECS194: First Experiments with TelosB Motes

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EECS194 First Experiments with TelosB Motes

• Joshua Kwan, Larry Ly, Kevin Liu

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What We Did

• Measure signal degradation over distance in
  various situations
• On flat table surface (Indoors)
• Through concrete floor (indoors)
• On concrete floor (outdoor)
• See whether another mote could be used in between
  router/mote to increase signal range.

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Test 1 Indoors / Table

• We moved remote fixed distance away from router
  on same horizontal plane, measuring signal
  strength at each distance.

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Test 2 Outdoor

• We tried to see whether positioning the router
  mote (horizontal or vertical) would affect signal
  strength.

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Test 3 Through Concrete

• We tested to see if ping still worked through a
  thick concrete floor.
• Problem Couldnt tell straight-line distance
  from router.

64 bytes from 10.97.116.174 icmp_seq66 ttl32
time522 ms 64 bytes from 10.97.116.174
icmp_seq67 ttl32 time56.0 ms 64 bytes from
10.97.116.174 icmp_seq68 ttl32 time1287 ms 64
bytes from 10.97.116.174 icmp_seq69 ttl32
time686 ms 64 bytes from 10.97.116.174
icmp_seq70 ttl32 time50.5 ms 64 bytes from
10.97.116.174 icmp_seq71 ttl32 time50.7 ms 64
bytes from 10.97.116.174 icmp_seq72 ttl32
time101 ms 64 bytes from 10.97.116.174
icmp_seq73 ttl32 time396 ms 64 bytes from
10.97.116.174 icmp_seq74 ttl32 time57.7 ms 64
bytes from 10.97.116.174 icmp_seq75 ttl32
time51.7 ms 64 bytes from 10.97.116.174
icmp_seq76 ttl32 time50.3 ms 64 bytes from
10.97.116.174 icmp_seq77 ttl32 time423 ms 64
bytes from 10.97.116.174 icmp_seq78 ttl32
time2115 ms 64 bytes from 10.97.116.174
icmp_seq80 ttl32 time41376 ms
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Test 4 Mote Hopping

• Tried to position motes so that one was in range
  of the router and one was only in range of the
  other mote.
• Repeating the concrete test, it extended range by
  17ft
• Repeating the outdoor test, extended at least
  15ft (we ran out of floorspace)