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Experiments Measuring Signal Degradation with TelosB Motes

This project explores the impact of distance and obstacles on signal degradation using TelosB motes. We conducted tests in various environments: indoors on a flat table, outdoors on a concrete floor, and through a concrete ceiling. The objective was to measure signal strength at different distances and assess effective configurations, including using an additional mote to increase range. Results indicated variations in signal performance based on position and environment, with significant range extension observed through mote hopping techniques.

mariko-curry
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Experiments Measuring Signal Degradation 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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