ESP8266 Community Forum

Hello, newbie question here.

I'm trying the simplest program with LED connected to D1 (or D2) but it does not work on these two pins (LED does not emit). I know these are supposed to be I2C pins but from what I read it should be possible to use them like that as well.

It actually works only when connected to D6/D5. No luck with other pins as well.

int led = D1;

void setup() {
pinMode(led, OUTPUT);
}

void loop() {
digitalWrite(led, HIGH);
delay(1000);
digitalWrite(led, LOW);
delay(1000);
}

Are your LED connected as "sink" mode ?
Because if it is connected as "source", it pulldown the pin and prevent the ESP to boot in normal mode.