ESP8266 Community Forum

Hi!

I've just flashed my ESP-01 (090) with electrodragon's 0.922 firmware via CP2101 USB to TTL converter.
Wiring: ESP VCC, CH_PD => USBTTL 3.3V; ESP GND, GPIO0 => USBTTL GND; ESP UTXD => USBTTL RXD; ESP UTRD => USBTTL TXD (everything connected without resistors).

After successful flashing (both XTCOM on Windows and esptool.py on Linux works fine!), I can't connect to device neither @9600, nor @115200.

Am I doing right with removing LOW from GPIO0 and HIGH from CH_PD for normal operation after flashing? Can I leave them unconnected?
Should I reset device someway or just turn it off and on again?
Do I need to use external 3.3V? Whether power sources should have common ground?

I would be glad to any suggestions!

Alexander.

Problem caused by insufficient power supply, now solved.

VCC and GROUND taken from external 3.3V source, ground joined with USB to TTL ground.

Bad power supply seems to be a lot of peoples issues!

You need a good string 300-400mA for sure...

Richard.

admin wrote:Bad power supply seems to be a lot of peoples issues!

You need a good string 300-400mA for sure...

Richard.

+1 it is somewhat unpredictable what issues you see with an insufficient power-supply. just make sure you have enough juice as you develop and you can test how much you can scale back when everything is working.