ESP8266 Community Forum

- Thu Nov 06, 2014 1:23 pm #2284 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.

Last edited by volax on Fri Nov 07, 2014 7:38 am, edited 1 time in total.

- Thu Nov 06, 2014 4:14 pm #2291 Problem caused by insufficient power supply, now solved.

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

[RichardS]

- Thu Nov 06, 2014 4:24 pm #2292 Bad power supply seems to be a lot of peoples issues!

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

Richard.

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- Fri Nov 07, 2014 1:12 am #2303

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.