ESP8266 Community Forum

Hello,
I'm using ESP-01. When I try write some code it doesn't work. My GPIO_2 is still HIGH(3.3V) and GPIO_0 (2V).


When I try add Serial.print("A") into loop, serial monitor print something like this : rl��r��c�n�����p�...
but not in loop only when I restart modul.

Can anybody help me please?

Hi, did you solve your problem?
I tested your code with a olimex mod_wifi_esp8266_dev module and it works fine.
Maybe your setup (gpio0 etc.) is not correct? I added a pullup resitore to the reset pin which makes my board running more stable.

Regards,
Kaef

either your serial monitor is the wrong baud rate and/or you've booted into flash mode as GPIO_0 should be floating, not connected to VCC (or GND)

sej7278 wrote:GPIO_0 should be floating, not connected to VCC (or GND)

That's not what I've read in Espressif docs.