| Lab Name |
How is Distance Affected by Transmission Frequency?
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| Subject Area |
Engineering, Computer Science
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| Grade |
9 - 12
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| Topic |
Frequency & Distance
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| Experiment Title |
Measuring the furthest distances that a wireless message can be transmitted for different technologies.
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| Hardware |
- COSMOS Toolkit: Computer Node
- 2 x Walkie Talkie
- 2 x Android phone
- COSMOS IoT: CS node (XBee 900MHz)
- COSMOS IoT: CS node (Infrared Tx/Rx)
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| Software |
- COSMOS Toolkit: Framework
- Arduino XBee_Rx code
- Arduino XBee_Tx code
- Arduino IR_Rx code
- Arduino IR_Tx code
- Wi-Fi Analyzer app (for Android phone)
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| Number of Sessions to teach the topic |
2 sessions
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| Educational standards to be addressed |
- HS-PS4-1
Use mathematical representations to support a claim regarding relationships among the period, frequency, wavelength, and speed of waves traveling and transferring energy (amplitude, frequency) in various media.
- HS-ETS1-1
Analyze a major global challenge to specify qualitative and quantitative criteria and constraints for solutions that account for societal needs and wants.
- HS-ETS1-2
Design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems that can be solved through engineering.
- HS-ETS1-3
Evaluate a solution to a complex real-world problem based on prioritized criteria and trade-offs that account for a range of constraints, including cost, safety, reliability, and aesthetics, as well as possible social, cultural, and environmental impacts.
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| COSMOS concepts to be used for the lab |
Electromagnetic frequency, Attenuation of signal through air, Relationship between signal strength and distance
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| K12 Educational Goals (How the educational goals are achieved through teaching using the experiment, how the topic is connected to the COSMOS concepts used) |
As students gather data about the distances that wireless messages will travel, they will be able to compare technologies and frequencies of those technologies to see an inverse relationship.
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| Short Description and Walk-through of the experiment |
For each technology:
- Group is given a RECEIVER, TRANSMITTERs stay in classroom
- Group walks around with receiver & map of surroundings
- Place O on map when receive message
- Place X on map when NO message
- Keep walking around to see a range map of the technology
- Repeat for a 2nd Technology
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| Testbed mapping of the experiment |
- Instead of a map of the classroom/school, students could work off of a map of Harlem.
- Transmitters would be set at a central location of testbed.
- Every other node could be set as a receiver and power levels could be mapped from each node.
- The procedure could be executed using all of the different wireless technologies that a COSMOS node employs (2.4GHz and 5 GHz WiFi, LTE, 5G-NR)
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