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Blogger reverse engineers Coway air purifier to run it locally without the cloud

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A DEV Community writer decided to reverse engineer their Coway air purifier after realizing it sent data to the cloud for features they did not need. They took the device apart and identified a microcontroller on the circuit board as the likely control point. After struggling to decode the device's app communication, they used tools such as the Arduino IDE and an ESP8266 module to build a local Wi-Fi interface. Their simple scripts successfully switched the fan on, though the process included setbacks such as a short circuit.

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