5. Burning firmware
Connect external power supply to the arduino control board, with the range of DC 7-12V. And its
GND and 5V interfaces are separately connected to the GND and 5V interfaces of WiFi shield.
Connect the GND RX TX of FT232 module to the shield, and the wiring method is as follows:
FT232_TXD------Digital Port1
FT232_RXD------Digital Port0
GND------------GND
a. Open ESP8266Flasher program, select COM Port.
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