"Wait, is Wi-Fi just blinking lights?"
summary
Wi‑Fi is electromagnetic light at GHz wavelengths (2.4 GHz ≈ 8 cm, a long‑range variant ≈ 30 cm) encoded with quadrature amplitude modulation and packed into many subchannels via OFDM, then protected by pseudorandom encryption streams. A working microcontroller demo uses a Raspberry Pi Pico with MicroPython, discrete RGB LEDs, light‑dependent resistors and color filters, calibration pilots and visualization to recover bits. Typical transmit powers are ~20–30 dBm (up to ~1 W) and phase/pilot synchronization proves essential.
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chapters (8)
- 0:00Welcome
- 1:53Wi-Fi is light
- 4:43Wi-Fi layers
- 8:40Quadrature amplitude modulation
- 10:48Wi-Fi encryption
- 11:09Live Wi-Fi signals
- 18:32Wi-Fi performance tech
- 20:20Q&A
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