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I'm confused about the role of the
Let's assume that I want to use it along with a and I want to flash it with .
The adapter should be used with both CP2102 and the relay or just with the relay?
ESP8266 adapter can be programmed using CP2102.
You can program your ESP8266 GPIO pin to trigger the relay.
Once the circuit will be fully functional, you can remove CP2102 module from the circuit. It is used only for programming.
Required, but never shown