Sensor nodes

SoccerBoss
Category:
Programming
Price: $5 USD

Question description

a.A typical sensor node has a transmit duty cycle of 4% (see Activity 6 ) and draws a current of 1.95 mA while it is in the active part of the duty cycle, and negligible current while in the inactive part of the duty cycle. On average, the node sends 390 bits of data per transmission and each transmission takes 35.0 ms.

  • i.How long does each node transmit for in every hour? Express your answer in seconds.
  • ii.If each sensor node has a battery with a capacity of 2610 mAh, how long a transmission is this battery capable of powering before it must be recharged or replaced? Express your answer in seconds in scientific notation.
  • iii.At what data rate is data transferred in each transmission? Express your answer in kbps.

Give all your answers to 3 significant figures.


Activity 6

Calculate the duty cycle of a device that typically connects to a network and transmits for 20 ms in every 0.5 s. You may wish to use a calculator for this activity.

Answer

20 ms = 20 × 103 s = 0.02 s

So the duty cycle is (0.02/0.5) × 100% = 4%

This means that the device is operational for only 4% of the time.


Studypool has helped 1,244,100 students
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1822 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors