If you are using a NodeMCU firmware on you ESP take note on the GPIO table mapping.

All access is based on the I/O index number on the NodeMCU dev kits, not the internal GPIO pin. For example, the D0 pin on the dev kit is mapped to the internal GPIO pin 16.

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gpio.mode(0, gpio.OUTPUT)

 

For Olimex ESP8266 EVB board you can use the folowing definitions

–define GPIO pins

GPIO0 = 3
GPIO1 = 10
GPIO2 = 4
GPIO3 = 9
GPIO4 = 2
GPIO5 = 1
GPIO9 = 11
GPIO10 = 12
GPIO12 = 6
GPIO13 = 7
GPIO14 = 5
GPIO15 = 8
GPIO16 = 0

 

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Note the the GPIO pins are available on the UEXT connector and on the CON3

 

 

 

 

 

 

ESP8266 NodeMCU pins GPIO
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