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EECS194: First Experiments with TelosB Motes

EECS194: First Experiments with TelosB Motes. Joshua Kwan, Larry Ly, Kevin Liu. What We Did. Measure signal degradation over distance in various situations: On flat table surface (Indoors) Through concrete floor (indoors) On concrete floor (outdoor)

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EECS194: First Experiments with TelosB Motes

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  1. EECS194: First Experiments with TelosB Motes Joshua Kwan, Larry Ly, Kevin Liu

  2. 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.

  3. Test 1: Indoors / Table • We moved remote fixed distance away from router on same horizontal plane, measuring signal strength at each distance.

  4. Test 2: Outdoor • We tried to see whether positioning the router & mote (horizontal or vertical) would affect signal strength.

  5. Test 3: Through Concrete • We tested to see if ‘ping’ still worked through a thick concrete floor. • Problem: Couldn’t tell straight-line distance from router. 64 bytes from 10.97.116.174: icmp_seq=66 ttl=32 time=522 ms 64 bytes from 10.97.116.174: icmp_seq=67 ttl=32 time=56.0 ms 64 bytes from 10.97.116.174: icmp_seq=68 ttl=32 time=1287 ms 64 bytes from 10.97.116.174: icmp_seq=69 ttl=32 time=686 ms 64 bytes from 10.97.116.174: icmp_seq=70 ttl=32 time=50.5 ms 64 bytes from 10.97.116.174: icmp_seq=71 ttl=32 time=50.7 ms 64 bytes from 10.97.116.174: icmp_seq=72 ttl=32 time=101 ms 64 bytes from 10.97.116.174: icmp_seq=73 ttl=32 time=396 ms 64 bytes from 10.97.116.174: icmp_seq=74 ttl=32 time=57.7 ms 64 bytes from 10.97.116.174: icmp_seq=75 ttl=32 time=51.7 ms 64 bytes from 10.97.116.174: icmp_seq=76 ttl=32 time=50.3 ms 64 bytes from 10.97.116.174: icmp_seq=77 ttl=32 time=423 ms 64 bytes from 10.97.116.174: icmp_seq=78 ttl=32 time=2115 ms 64 bytes from 10.97.116.174: icmp_seq=80 ttl=32 time=41376 ms

  6. 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)

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