Channel State Information turns an ordinary Wi-Fi link into a motion, presence and breathing sensor. Twenty hands-on guides, projects and explainers, with real demos and working ESP32 code.
CSI vs RSSI for Wi-Fi sensing: RSSI is one power number, CSI is amplitude and phase per subcarrier. Why CSI se
Read→ Wi-Fi CSIHow OFDM splits a Wi-Fi channel into subcarriers, why 20/40/80 MHz have different counts, data vs pilot vs nul
Read→ Wi-Fi CSIAmplitude vs phase in Wi-Fi CSI: what each tells you, why raw phase is noisy from CFO, SFO and random offsets,
Read→ Wi-Fi CSIThe standard pipeline to clean Wi-Fi CSI: drop null and pilot subcarriers, Hampel outlier filtering, smoothing
Read→ Video · Wi-Fi CSICapture Wi-Fi CSI on an ESP32 step by step: enable CSI, read the callback, compute per-subcarrier amplitude, a
Read→How Wi-Fi CSI tells an occupied room from an empty one with no camera: baseline, a motion-energy threshold, ho
Read→ Video · Wi-Fi CSIBuild a camera-free Wi-Fi CSI motion alarm on an ESP32: learn the empty-room baseline, score motion from CSI v
Read→ Wi-Fi CSIHow Wi-Fi CSI can sense breathing: chest motion modulates the channel at 0.1 to 0.5 Hz, how band-pass plus FFT
Read→ Wi-Fi CSIHow a fall looks in Wi-Fi CSI: a fast transient then stillness. Why camera-free sensing appeals for elder care
Read→ Video · Wi-Fi CSIHow Wi-Fi CSI tells walking from sitting from gestures: the signatures activities leave, the feature-and-class
Read→ Video · Wi-Fi CSIHow hand gestures like push, swipe and zoom show up in Wi-Fi CSI as Doppler shifts, how a classifier learns th
Read→ Video · Wi-Fi CSIWhy counting people with Wi-Fi CSI is harder than presence, how motion-energy and learned models estimate a co
Read→Can Wi-Fi see through walls? An honest look at CSI through-wall sensing: what 2.4 GHz really passes through, w
Read→ Wi-Fi CSICan Wi-Fi find your position indoors? Why one antenna cannot, how anchors with trilateration, AoA, ToF and fin
Read→ Wi-Fi CSIWhat one ESP32 antenna of Wi-Fi CSI really does: presence, motion, breathing, rough distance. What it cannot:
Read→IEEE 802.11bf is the task group standardizing Wi-Fi sensing so CSI measurements work across devices. What it i
Read→ Wi-Fi CSIWi-Fi CSI, mmWave radar and PIR all sense presence differently. Compare principle, still-person detection, ran
Read→ Wi-Fi CSIThe practical Wi-Fi CSI machine-learning toolchain: capture tools, the kinds of public datasets to look for, f
Read→ Wi-Fi CSIWi-Fi CSI reveals presence, motion and breathing, but not your face, screen or identity. An honest look at Wi-
Read→Want the board behind these projects? The SGP Card Mini captures CSI out of the box.
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