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You start with a standard serial cable containing the TX, RX, DTR, and GND wires. This cable connects the Arduino to the ESP8266 WiFi module. The TX and RX lines are then tapped into.
On-board jumpers allow the transmitter and receiver to be connected to a choice of Arduino I/O pins – default is Tx is connected to UART Serial pin 1 and Rx to UART Serial pin 0. The associated ...
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