Wireless and Optical Sensing for IoT
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Depth: Practitioner
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Your guide: Radio Remi
“A crisp trace is not yet a trustworthy claim. Name the frame, the threshold, and the case that could fool it.”
Start With the Module
This section: Start With the Module — Wireless and optical sensors can reveal motion, position, range, and shape without attaching a tag to every target.
Wireless and optical sensors can reveal motion, position, range, and shape without attaching a tag to every target. They do not reveal those facts automatically. A receiver observes changing channel measurements or returned energy; an engineer must connect that observation to a carefully limited decision.
In this module, you will follow that evidence chain. You will calibrate synthetic Wi-Fi CSI, compare RF localisation errors, recover targets from an FMCW beat signal, operate simulated optical ranging sensors, and filter both a licensed radar sample and a synthetic lidar scene. The second wave adds simulated human-motion phase analysis, an OFDM sensing trade-off, cautious hidden-device detection, and a privacy design record. Every lab ends by stating what its result does not prove.
Chapters by Part
This section: Chapters by Part
Sensing Foundations
- Wi-Fi CSI Sensing — detect change while managing baselines, abstention, and consent.
- RF Localisation — compare RSSI, time, angle, UWB, and fusion using tail error.
- FMCW Radar Basics — trace chirps through beat frequency, range, Doppler, and angle.
- Lidar and Optical Ranging — choose optical methods by surface, geometry, and safety needs.
- Point Clouds from Radar and Lidar — filter, cluster, associate, and score bounded scenes.
- Presence and Vital-Sign Sensing — separate breathing and heartbeat cues while rejecting contaminated windows.
- Integrated Sensing and Communication — compare shared OFDM sensing with link throughput and update needs.
- Hidden Cameras and Rogue Devices — classify candidates from safe metadata and compare RF and optical blind spots.
- Sensing Privacy and Consent — minimise the flow, name the lawful and consent questions, and export a decision record.
Choose a Starting Point
This section: Choose a Starting Point — Begin with Wi-Fi CSI if you are new to sensing evidence.
Begin with Wi-Fi CSI if you are new to sensing evidence. Begin with the chapter nearest your design decision if you already know the modality, but carry its coordinate frame, calibration boundary, failure cases, and acceptance metric into the lab.
Before proposing a deployed sensor, complete the Sensing Privacy and Consent checklist.
Find help
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Where should I start in a module?
Open the module page from the sidebar to see its chapters in order. Use the module map to return to a topic you need.
Modules and pathsReviewed
What can I try when a project does not work?
Check the symptom, then work through the diagnostic steps. Keep the error message and the smallest example that reproduces it.
When you are stuckReviewed
How do interactive examples work?
Use the interactive guide to check how examples and simulations work before changing your project.
Interactive examples guideReviewed