Blink Example won't blink

[Gorkde]

It worked without problems with 2.2.0
My LED is ok since it's blinking when uploading.

The Check Config Sketch can upload and is working fine.

Just the LED isn't blinking with ESP8266 Blink example.

[igrr]

Please post the sketch you are using, specify which hardware you run it on, and the settings in the IDE which you use.

[Gorkde]

I'm using a ESP-12F
I'm using the standard Blink Sketch of ESP8266

I did now measure Pin 1 and it's changing state 0V/VCC as it should.

On one side of the LED (the one pointing away of pin 1) I can measure VCC
But the other side seems to be floating just touching it changes state from off to dim on all the time (0,8V) and off again.

/*
 ESP8266 Blink by Simon Peter
 Blink the blue LED on the ESP-01 module
 This example code is in the public domain

 The blue LED on the ESP-01 module is connected to GPIO1 
 (which is also the TXD pin; so we cannot use Serial.print() at the same time)

 Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
*/

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
                                    // but actually the LED is on; this is because 
                                    // it is acive low on the ESP-01)
  delay(1000);                      // Wait for a second
  digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  delay(2000);                      // Wait for two seconds (to demonstrate the active low LED)
}

[igrr]

@Gorkde, there is no way this sketch could have triggered an LED on ESP12F with 2.2.0.
In fact, I have a copy of 2.2.0 installed and I have just verified that this doesn't work on 2.2.0.
Reason for this is simple — unlike ESP-01, on ESP12 LED is connected to GPIO2, not GPIO1 :)
It blinks during upload because GPIO2 is configured as UART0_TXD by bootloader, so it acts in the same way as GPIO1.

I think example should be updated to note that for ESP12E/F, pin has to be changed to 2.

[Gorkde]

Ok, so maybe I had this messed up with my tests on the Wemos but on any of those I had 2.2.0 blink the led I'm pretty sure. But at least I know the reason now, thanks!

[Gorkde]

Maybe you shoud just add a Blink_ESP-12 example and a LED_BUILTIN_12.

[SteveToulouse]

Sorry to butt in. Wouldn't it be clearer (though perhaps more work) to define two "generic" variants in the boards list instead of one - one for ESP01-ESPxx where the built-in LED is on GPIO1, and another for ESP12E and others where the LED on GPIO2 (the d1, d1-mini, espino, espresso variants have LED_BUILTIN = 2 already)? There are perhaps other constants which differ too, because of the extra pins on the 12E/F?

[Gorkde]

That's what I thought later on also.
Maybe the best way.

[bigbuglamer]

There exists esp12e boards with led connected to gpio1 (early release ones). So i personally think ... no fix there possible, because current releases of them have led connected to gpio2.

[vicnevicne]

Well, "Blink" is probably the most used sample, and I guess most modules sold today (stand-alone or on a board) have their internal led on GPIO2, so I think it's important that it is made simple for newcomers.
I would suggest adding another define for the alternate led pin, and change the sample to either make it clear in a comment that it must be adapted according to the board... or better yet, make both pins blink !

[ghosty-be]

darn, been looking for this for half an hour now ... read some examples where it said 1 or 3 ... never tried pin 2, was thinking that I did something wrong :)

[vadimcoder]

Blink example works fine for me. I have the following configuration:

[pjparsons]

sorry to branch off on this topic... how do I change the (Port: "/dev/cu.SLAB_USBtoUART") Mine only shows up as com 1 and com 3. I know it is connect to com 3 because I get 2 squares in the serial monitor window when I connect reset to ground. I cannot get this LED to flash... It doesn't flash when it is transferring. Arduino IDE says it did compile