ESP8266 Community Forum

- Wed Nov 22, 2017 8:46 am #71996 Hello everyone,
i've already worked a lot with the ESP8266-01, more or less without any problem.
So i've decided to buy some ESP8266-12F to upgrade my projects.
WORST CHOICE EVER.

I've tried a lot of different wiring on the breadboard in order to flash it, but without any result.

As programmer i use the FTDI232


Basically i use to flash the boards the NodeMCU Flasher software, with no results at the moment with this board.

The wiring is this one:

VCC -> +3.3V (from the programmer)
GND -> GND (from the programmer)
TXD0 -> RX
RXD0 -> TX
EN -> VCC
GPIO15 -> GND
GPIO0-> GND

Can anyone help me?

- Thu Nov 23, 2017 11:42 pm #72027 ESP8266 12F modules are a very good and stable "12" version, never had any problems with.

Your connection is not exactly what do you need for proper programming the ESP8266 module and also you need a proper 3.3Vcc power supply, the 3.3Vcc provided by the FT232 is not powerful enough.

For a basic configuration with Reset and Programming buttons, take a look at the nEXT Evo board schematics

If you want a more advanced configuration, with Auto-reset capabilities, with or without isolated interface to protect your computer USB ports, etc, look also at the USBProg schematic

ESP8266 MPDMv4 AC MAINS Dimmer Home: http://esp8266-projects.com/2016/04/mpdmv4-mains-dimmerswitch-html/
Available on Tindie: https://www.tindie.com/products/nEXT_EVO1/universal-ac-mains-dimmer-mpdmv41/

- Fri Nov 24, 2017 6:38 am #72033 I agree the ESP12-F is a good choice for esp8266 module. I have over 20 of these installed now with no problems.

As mentioned your problems with flashing are the power and the hook up.

You can't use the on-board 3.3V supply from the serial interface reliably as it does not supply enough current. Either use a separate 3.3V supply or do what I do which is to cut the trace to the 3.3V output pin on the serial interface and put on board a LDO 3.3V regulator to supply that pin.

The GPIO00 pin should only be held low during a reset to put it into serial programming mode. Otherwise it should be high. This can be done as suggested either by using push buttons or with an automatic circuit.

- Fri Nov 24, 2017 9:09 am #72041 Many thanks @btidey and @trackerj i will for shure take a look at those projects.
I will try with more power adding an external power supply for the 3.3V.
Do you confirm that the other wiring are correct?
So the new wiring shoud be:

VCC -> +3.3V (external power supply)
GND -> GND (external power supply)
TXD0 -> RX
RXD0 -> TX
EN -> VCC
GPIO15 -> GND
GPIO0-> GND[*]