user31974: 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?

user31974: 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.

31974: <p>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.</p>

<p>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.</p>

<p>What could be the problem?</p>
 31974: <p>Power supply...</p>

<p>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.</p>

<p>Seems like the ESP is really sensitive to the power supply stability.</p>
