ESP8266 Community Forum

- Thu Mar 26, 2020 10:09 am #86203 I tried powering the ESP8266 chip from the Vcc/Gnd pins on a 3.3V FTDI board that I'm using to flash and also tried adding a 3.3V breadboard power supply (that plugs into both pairs of power rails).

In either configuration, I was still able to flash an simple LED blink sketch successfully. Then I'd go back to flashing the Expressif 1.6 firmware and not be able to use any AT commands.

- Thu Mar 26, 2020 11:55 am #86204 You can run the Blink sketch on 3.3 V from FTDI?

- Fri Apr 03, 2020 5:09 pm #86332 Hi there.

Interesting. It doesn't look like I can even flash a simple sketch. I tried this sketch. It flashed with no errors, but the blue light doesn't flash.

Code: Select all#define LED 2 //Define blinking LED pin

void setup() {
  pinMode(LED, OUTPUT); // Initialize the LED pin as an output
}
// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED, LOW); // Turn the LED on (Note that LOW is the voltage level)
  delay(1000); // Wait for a second
  digitalWrite(LED, HIGH); // Turn the LED off by making the voltage HIGH
  delay(1000); // Wait for two seconds
}

I'm afraid of trying this on another -01 module. Every time I flash something, it's broken from that point on. I've seen this problem on 2 out of 6 modules. Could they be fried?

Note: I have been flashing with a 3.3V FTDI board...

Thanks for the help.

- Sat Apr 04, 2020 1:22 am #86335 the 3.3 V pin of the FTDI can supply the esp8266 in flashing mode because WiFi is off. but it can't supply the esp8266 with WiFi running. and the esp8266 starts the WiFi module immediately after boot.