ESP8266 Community Forum

- Wed Apr 26, 2023 10:34 am #96293 esptool.py v3.0
Serial port COM6
Connecting........_____....._____....._____....._____....._____....._____....._____

A fatal esptool.py error occurred: Failed to connect to ESP8266: Invalid head of packet (0x00)

Script: /*
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 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)
},
Wiring:
VCC -> 3.3 V, GND -> GND, CH_PD -> 3.3V, GPIO 0 -> GND, TX -> Arduino TX, RX -> Arduino RX.

- Tue May 02, 2023 5:35 am #96313 Hello, the connection should be

Arduino Tx....ESP Rx
Arduino Rx....ESP Tx