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I try to flash an ESP12E microcontroller through an FTDI serial converter. It seems like the UART connection is a bit unstable, because when I try to flash it via esptool it often throws "Timed out waiting for packet header" error. Also when I thy to get the flash_id the same error occures at around 50% of the time. The simplier commands like get_mac and chip_id are working well.

I'm using an ESP module with wires soldered to its pads. It is put into a breadboard and it's connected to a USB-UART converter via jumper wires.

What could be the problem?

asked Apr 22, 2017 at 21:37
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    I have several 4 x ESP07's, 2 x ESP12E's and 14 x ES12F's ... the 07's and 12F's never give me problems, however, the two 12E's are unstable as hell when using FTDI, even flashing OTA whilst powered by FTDI cable is a 50/50 proposition - ditch the 12E's get some 12F's is my advice Commented Apr 23, 2017 at 23:26

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Power supply...

I designed a pcb for the ESP module, it works like a charm since then. Used a TC1262 regulator, a 100n ceramic and a 1000u electrolyte capacitor (maybe 100u would have been enough) very close to the Vcc and GND pins.

Seems like the ESP is really sensitive to the power supply stability.

answered Apr 29, 2017 at 11:40

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