digitalWeite( led, HIGH ) doesn't work!

[danxinzhujian]

I tried the code on my arduino, everything works well but "digitalWrite(led, HIGH)" has no reply. I also tried digitalRead(pin), the value is LOW all the time. Is there something wrong with Arduino library? I'm using General esp8266 module.

[allenhuffman]

I cannot speak for the esp8266, but on Arduino, as long as the led pin is defined correctly, that is all it should take:

https://www.arduino.cc/en/Tutorial/Blink?from=Tutorial.BlinkingLED

The built in LED pin is different on different devices, so you may have to customize those settings (for instance, it's pin 13 on my device, rather than 6 as this source code defaults to).