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Corrected the answer with specifics for ESP8266 and a picture
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MatsK
MatsK
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Move int greenLedPin = D1; and int redLedPin = D3; to another pin, because D0 and D1 and D3 is Tx and Rx.

enter image description here

http://esp8266.github.io/Arduino/versions/2.0.0/doc/reference.html

Move int greenLedPin = D1; to another pin, because D0 and D1 is Tx and Rx.

Move int greenLedPin = D1; and int redLedPin = D3; to another pin, because D1 and D3 is Tx and Rx.

enter image description here

http://esp8266.github.io/Arduino/versions/2.0.0/doc/reference.html

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MatsK
MatsK
  • 1.4k
  • 1
  • 11
  • 25

Move int greenLedPin = D1; to another pin, because D0 and D1 is Tx and Rx.