Problem uploading sketch to arduino uno/esp8266 - arduino

Question

Getting this error while uploading:
Arduino: 1.8.13 (Windows Store 1.8.42.0) (Windows 10), Board: "Generic ESP8266 Module, 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), dtr (aka nodemcu), 26 MHz, 40MHz, DOUT (compatible), 1MB (FS:64KB OTA:~470KB), 2, nonos-sdk 2.2.1+100 (190703), v2 Lower Memory, Disabled, None, Only Sketch, 115200"
Executable segment sizes:
IROM : 236720 - code in flash (default or ICACHE_FLASH_ATTR)
IRAM : 26892 / 32768 - code in IRAM (ICACHE_RAM_ATTR, ISRs...)
DATA : 1252 ) - initialized variables (global, static) in RAM/HEAP
RODATA : 780 ) / 81920 - constants (global, static) in RAM/HEAP
BSS : 24976 ) - zeroed variables (global, static) in RAM/HEAP
Sketch uses 265644 bytes (27%) of program storage space. Maximum is 958448 bytes.
Global variables use 27008 bytes (32%) of dynamic memory, leaving 54912 bytes for local variables. Maximum is 81920 bytes.
esptool.py v2.8
Serial port COM3
Connecting........_____....._____....._____....._____....._____....._____.....____Traceback (most recent call last):
File "C:\Users\Arsh\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.7.4/tools/upload.py", line 65, in <module>
esptool.main(cmdline)
File "C:/Users/Arsh/Documents/ArduinoData/packages/esp8266/hardware/esp8266/2.7.4/tools/esptool\esptool.py", line 2890, in main
esp.connect(args.before)
File "C:/Users/Arsh/Documents/ArduinoData/packages/esp8266/hardware/esp8266/2.7.4/tools/esptool\esptool.py", line 483, in connect
raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
or it says Invalid Head of Packet(0xF0)
_
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
This is the pin configuration:
Insted of the 3.3v im using a voltage regulator.
Also RX connected to RX & TX to TX.
Code:
#include <ESP8266WiFi.h>
void setup()
{
Serial.begin(115200);
Serial.println();
WiFi.begin("username", "password");
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println();
Serial.print("Connected, IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {}
Someone suggested to ground the GPIO0, didn't work.
Tried installing different version of the Board:"Generic ESP8266 Module" still getting the same error.
The module works fine when working without the library using the Board:"arduino uno"

Answer 1

GPIO-00 needs to be held at ground while RESET goes to ground, then back to high. This reboots the ESP-01 into the FLASH mode.
For a good overview of a circuit to accomplish this, read:
https://www.allaboutcircuits.com/projects/flashing-the-ESP-01-firmware-to-SDK-v2.0.0-is-easier-now/
Read about the ESP8266 boot modes here:
https://tttapa.github.io/ESP8266/Chap04%20-%20Microcontroller.html

Answer 2

Could you give more details about the 3.3V regulator that you using?
Do you have it connected between the serial signals?
If that is the case, I suggest this connection instead:
3.3V signal voltage divisor
ESP TX and Arduino RX can be connected directly without any issue