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A comment on Count the people around you by monitoring wifi signals.

Re:Count the people around you by monitoring wifi signals by gregod on Thursday January 17, 2019 @01:50PM (#18933379)
There is also https://github.com/cyberman54/ESP32-Paxcounter

"Wifi & Bluetooth driven, LoRaWAN enabled, battery powered mini Paxcounter built on cheap ESP32 LoRa IoT boards"

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