ESP8266 Community Forum

- Fri Nov 02, 2018 7:09 am #78992 Arduino Uno (no serial-USB built in)

Arduino IDE with esp8266 package installed.


Sketch upload with no error at 115200 baud. ESP red light is on on power on, blue light blink during upload. The ESP leds let us think everything is normal.


But when I remove GPIO0-GND cable (switch the ESP in normal mode) The ESP don't run the code. Even blink doesn't work.

Something else is strange: When I write a command in the serial monitor, nothing appears, but when I press the reset button just after giving the command, the serial monitor display unreadable strings:


Serial returns this after giving a command and pressing "reset" esp button


My configuration is:



Programming Mode (Upload and commands)




Normal mode (TX and RX are crossed, I forget it on the scheme)


Why does the sketch doesn't run ? Thanks

- Mon Nov 05, 2018 12:39 pm #79027 Half resolved:

Sketches acutally run, I was thinking they doesn't because Blink Sketch don't works
The blue built in led is not broken, it turns on on start and blink during sketch upload.


But when I upload the blink sketch, or any sketch that contains the code that tell the led to blink, all is working except that the blue light doesn't blink when I'm asking for !

This is the code from examples>esp8266>blink:

Code: Select allvoid 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 active 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)
}

- Tue Nov 06, 2018 3:41 am #79036 Please ditch your setup for now and read my signature first (buy a development board).

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.